Name: development of a backbone cyclic peptide library as potential antiparasitic therapeutics using microwave irradiation
Uploaded: 2016-01-26T20:00:00
Description: Watch this Scientific Journal Video about Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation at JoVE.com

We thank Lauren Van Wassenhove, Sunhee Hwang, and Daria Mochly-Rosen for helpful discussions. The work was supported by the National Institutes of Health Grant NIH RC4 TW008781-01 C-IDEA (SPARK) to N.Q. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

1. Equipment and Reagents Preparation
<ol>
	<li>Preparing equipment
	<ol>
		<li>Perform all steps inside a fume hood using proper personal protective equipment.</li>
		<li>Chemically synthesize peptides on solid support using a Microwave Peptide Synthesizer with an additional module of Discover equipped with a fiber-optic temperature probe for controlling the microwave power delivery in a Teflon reaction vessel (30 ml, with a glass frit) or in a disposable polypropylene cartridge (12 ml, with a coarse frit).</li>
		<li...

The synthesis of a focused library of backbone cyclic peptides derived from the LACK protein of the Leishmania parasite using a fully automated microwave synthesizer is described. A focused library of cyclic peptides was developed with conserved pharmacophores and various linkers. Addition of various linkers such as glutaric anhydride, succinic anhydride, adipic acid, pimelic acid, lysine, ornithine, and other building blocks can be used to increase the variety of the conformational space of the cyclic peptides....

Protein-protein interactions (PPIs) play a pivotal role in most biological processes, from intracellular signal transduction to cell death1. Hence, targeting PPIs is of fundamental importance to basic research and therapeutic applications. PPIs can be regulated by specific and stable antibodies, but antibodies are expensive and difficult to manufacture and have poor bioavailability. Alternatively, PPIs can be targeted by small molecules. Small molecules are easier to synthesize and inexpensive compared to antibodies; however, they are relatively less flexible and fit better to small cavities than to large protein-protein interfaces2,3. Diverse studies have demonstrated that peptides, which are simpler and cheaper than antibodies and more flexible than small molecules, can bind protein interfaces and regulate PPIs4,5. The global therapeutic peptide market was valued around fifteen billion dollars in 2013 and is growing 10.5% annually6. Furthermore, there are more than 50 marketed peptides, around 270 peptides in different phases of clinical testing, and about 400 peptides in advanced preclinical phases7. Although numerous peptides are being used as drugs, peptides still pose several challenges that limit their widespread application including poor bioavailability and stability, inefficiency in crossing cell membranes, and conformational flexibility8,9. One alternative to surmount these drawbacks is to apply different modifications such as local (D-amino acid and N-alkylation) and global (cyclization) constraints8,10-12. These modifications also occur naturally. For example, cyclosporin A, an immunosuppressant cyclic natural peptide, contains a single D-amino acid and undergoes N-alkylation modifications13,14.
Modification of natural amino acids to induce local constraints, such as D- and N-alkylation, often affects the peptide&#39;s biological activity. However, cyclization, in which the sequence of interest can remain the same, is more likely to preserve biological activity. Cyclization is a highly attractive way to restrict peptide conformational space by reducing the equilibrium between different conformations. It usually increases biological activity and selectivity by restricting the peptide to the active conformation that mediates only one function. Cyclization also improves peptide stability by keeping the peptide in a conformation that is less recognized by degrading enzymes. Indeed, cyclic peptides were shown to have improved metabolic stability, bioavailability, and selectivity compared to their linear counterparts15-17.
However, cyclization can be a double-edged sword since in some cases the restriction may prevent the peptides from achieving a bioactive conformation. To overcome this hurdle, a focused library in which all peptides have the same primary sequence and consequently constant pharmacophores can be synthesized. Peptides in the library differ in parameters that influence their structure, such as ring size and position, in order to subsequently screen for the most bioactive conformation9,18.
Peptides can be synthesized both in solution and by a solid-phase peptide synthesis (SPPS) approach, which is now the more prevalent peptide synthesis approach and will be discussed further. SPPS is a process by which chemical transformations are performed on a solid support via a linker to prepare a wide range of synthetic compounds19. SPPS enables assembling peptides by consecutive coupling of amino acids in a stepwise manner from the C-terminus, which is attached to a solid support, to the N-terminus. The N-&#945;-amino acid side-chains must be masked with protecting groups that are stable in the reaction conditions used during peptide elongation to ensure the addition of one amino acid per step. In the final step, the peptide is released from the resin and the side-chain protecting groups are concomitantly removed. While the peptide is being synthesized, all soluble reagents can be removed from the peptide-solid support matrix by filtration and washed away at the end of each coupling step. With such a system, a large excess of reagents at high concentration can drive coupling reactions to completion and all the synthesis steps can be performed in the same vessel without any transfer of material20 .
Although SPPS has some limitations such as the production of incomplete reactions, side reactions, impure reagents, as well as difficulties monitoring the reaction21, the advantages of SPPS have made it the &#34;gold standard&#34; for peptide synthesis. These advantages include the option to incorporate non-natural amino acids, automation, easy purification, minimized physical losses, and the use of excess reagents, resulting in high yields. SPPS has been shown to be extremely useful in the synthesis of difficult sequences21,22, fluorescent modifications23, and peptide libraries24,25. SPPS is also very useful for other poly-chain assemblies such as oligonucleotides26,27, oligosaccharides28,29, and peptide nucleic acids30,31. Interestingly, in some cases, SPPS was shown to be advantageous for synthesizing small molecules that are traditionally made in solution32,33. SPPS is used both in small scale for research and teaching34,35 as well as large scale in industry36-38.
Two synthesis strategies that are mainly used in SPPS methodology for the synthesis of peptides are butyloxycarbonyl (Boc) and 9-fluorenylmethoxycarbonyl (Fmoc). The original strategy introduced for SPPS was Boc, which requires strong acid conditions to remove side-chain protecting groups and cleave the peptide from the resin. Fmoc-based peptide synthesis, however, utilizes moderate base conditions and is a milder alternative to the acid-labile Boc protocol39. The Fmoc strategy utilizes orthogonal t-butyl (tBu) side-chain protection that is removed in the last step of the synthesis while cleaving the peptide from the resin under acid conditions.
The general principle for peptide synthesis on solid support is presented in Figure 1. The initial amino acid, masked by a temporary protecting group on the N-&#945;-terminus, is loaded onto the resin from the C-terminus. A semi-permanent protecting group to mask the side chain is also used if necessary (Figure 1, Step 1). The synthesis of the target peptide is assembled from the C-terminus to the N-terminus by repetitive cycles of deprotection of the N-&#945;-temporary protecting group (Figure 1, Step 2) and coupling of the next protected amino acid (Figure 1, Step 3). After the last amino acid is loaded (Figure 1, Step 4), the peptide is cleaved from the resin support and the semi-permanent protecting groups are removed (Figure 1, Step 5).
<img alt="Figure 1" src="/files/ftp_upload/53589/53589fig1.jpg" /> 
Figure 1. General scheme of solid phase peptide synthesis. The N-&#945;-protected amino acid is anchored using the carboxyl group via a linker to the resin (Step 1). The desired peptide is assembled in a linear fashion from the C-terminus to the N-terminus by repetitive cycles of deprotection of the temporary protecting group (TPG) from the N-&#945; (Step 2) and amino acid coupling (Step 3). After accomplishing the synthesis (Step 4), the semi-permanent protecting groups (SPG) are deprotected during peptide cleavage (Step 5). <a href="https://www.jove.com/files/ftp_upload/53589/53589fig1large.jpg" target="_blank">Please click here to view a larger version of this figure.</a>
After assembly of the complete peptide chain, cyclization can be achieved by several alternatives: (A) head-to-tail cyclization &#8212; this is a convenient way but limited since it provides only one option for cyclization (Figure 2A), (B) cyclization using the amino acids from the sequence of interest that contain bioactive functional groups&#160;&#8212; however, the use of these amino acids may influence the biological activity (Figure 2B), and (C) cyclization by adding amino acids (or other building blocks) without disturbing the bioactive sequence. Introducing these molecules is widespread as it allows production of focused libraries without modifying the sequence of interest (Figure 2C).
<img alt="Figure 2" src="/files/ftp_upload/53589/53589fig2.jpg" /> 
Figure 2. Alternative peptide cyclization strategies. (A) head to tail cyclization, through a peptide bond between the C-terminus and N-terminus; (B) cyclization between functional groups such as a disulfide bond between cysteine residues (1), or an amide bond between the side chains of lysine to aspartic/glutamic acid (2), or side chain to N- or C-terminus (3-4); (C) cyclization by adding extra amino acids or amino acid derivatives or small molecules, for example before (R0) and after (R7) the bioactive sequence. <a href="https://www.jove.com/files/ftp_upload/53589/53589fig2large.jpg" target="_blank">Please click here to view a larger version of this figure.</a>
Microwave-assisted synthesis uses microwave irradiation to heat reactions, thus accelerating organic chemical transformations40,41. Microwave chemistry is based on the ability of the reagent/solvent to absorb the microwave energy and convert it to heat42. Before the technology became widespread, major drawbacks had to be overcome, including the controllability and reproducibility of synthesis protocols and lack of available systems for adequate temperature and pressure controls43,44. The first report of microwave-assisted peptide synthesis was done using a kitchen microwave to synthesize several short peptides (7-10 amino acids) with significant improvement of the coupling efficiency and purity 45. Moreover, microwave energy was shown to decrease chain aggregation, reduce side reactions, limit racemization, and improve coupling rates, which are all critical for difficult and long sequences46-53.
Currently the use of microwave irradiation for the synthesis of peptides or related compounds on a solid support is extensive, including (A) synthesis in water instead of organic solvent54; (B) synthesis of peptides with common post-translational modifications, such as glycopeptides55-58 or phosphopeptides59-61, whose synthesis is typically difficult due to the low coupling efficiency of sterically hindered amino acid derivatives; (C) synthesis of peptides with modification in the backbone, such as azapeptides, which can be formed by the replacement of the C(&#945;) of an amino acid residue with a nitrogen atom62, or peptoids, whose side chain is connected to the amide nitrogen rather than the C&#945; atom63,64; (D) synthesis of cyclic peptides65-71; and (E) synthesis of combinatorial libraries51,72. In numerous cases, the authors reported higher efficiency and reduced synthesis time using microwave irradiation as compared to the conventional protocol.
Using a rational design73-75, we developed anti-parasitic peptides that were derived from the scaffold Leishmania&#39;s receptor for activated C-kinase (LACK). LACK plays an important role in the early phase of Leishmania infection76. Parasites expressing lower levels of LACK fail to parasitize even immune-compromised mice77 as LACK is involved in essential parasite signaling processes and protein synthesis78. Therefore, LACK is a key scaffold protein79 and a valuable drug target. Focusing on sequences in LACK that are conserved in the parasites, but not in the host mammalian homolog RACK, we identified an 8 amino acid peptide (RNGQCQRK) that decreased Leishmania sp. viability in culture.
Here, we describe a protocol for the synthesis of backbone cyclic peptides derived from the LACK protein sequence described above. The peptides were synthesized on a solid support using microwave heating by SPPS methodology with Fmoc/tBu protocol. Peptides were conjugated to a TAT47-57 (YGRKKRRQRRR) carrier peptide through an amide bond as part of the SPPS. TAT-based transport of a variety of cargoes into cells has been used for over 15 years and delivery of the cargo into subcellular organelles has been confirmed80. Four different linkers, succinic and glutaric anhydride as well as adipic and pimelic acid, were used to perform the cyclization to generate carboxylic acid linkers of two to five carbons. Cyclization was done using microwave energy, and the final cleavage and side-chain deprotection steps were done manually without microwave energy. The use of an automated microwave synthesizer improved the product purity, increased the product yield, and reduced the duration of the synthesis. This general protocol can be applied to other studies that utilize peptides to understand important molecular mechanism in vitro and in vivo and further develop potential drugs for human diseases.

<table border="0" cellpadding="0" cellspacing="0" width="519">
	<tbody>
		<tr height="43">
			<td height="43" style="height:43px;width:140px;">REAGENTS</td>
			<td style="width:123px;"></td>
			<td style="width:107px;"></td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Solid support, Rink Amide AM resin ML</td>
			<td style="width:123px;">CBL</td>
			<td style="width:107px;">BR-1330</td>
			<td style="width:151px;">loading: 0.49 mmol/g</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Ala-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FA2100</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Arg(Pbf)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FR2136</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Asn(Trt)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FN2152</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Asp(OBut)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FD2192</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Cys(Trt)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FC2214</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Gln(Trt)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FQ2251</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Glu(OtBu)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FE2237</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Gly-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FG2275</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-His(Trt)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FH2316</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Ile-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FI2326</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Leu-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FL2350</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Lys(Boc)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FK2390</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Met-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FM2400</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Phe-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FF2425</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Pro-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FP2450</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Ser-(tBu)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FS2476</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Thr(tBu)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FT2518</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Trp(Boc)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FW2527</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Tyr(But)-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FY2563</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Fmoc-Val-OH</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">FV2575</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">1-Methyl-2-pyrrolidinone (NMP)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">328634</td>
			<td style="width:151px;">Caution Toxic/Highly flammable/Irritant.</td>
		</tr>
		<tr height="20">
			<td height="140" rowspan="2" style="height:140px;width:140px;">N,N-Dimethylformamide (DMF)</td>
			<td rowspan="2" style="width:123px;">Alfa Aesar</td>
			<td rowspan="2" style="width:107px;">43465</td>
			<td style="width:151px;">Caution Toxic</td>
		</tr>
		<tr height="120">
			<td height="120" style="height:120px;width:151px;">Use high quality DMF to eliminate side reactions such as Fmoc removal as a result of the dimethylamine traces from DMF decomposition.</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Dichloromethane (DCM)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">D65100</td>
			<td style="width:151px;">Caution Harmful</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Dibromomethane (DBM)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">D41868</td>
			<td style="width:151px;">Caution Harmful</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Trifluoroacetic acid (TFA)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">T62200</td>
			<td style="width:151px;">Caution Corrosive/Toxic</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Trifluoroacetic acid, HPLC grade (TFA)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">91707</td>
			<td style="width:151px;">Caution Corrosive/Toxic</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Diethylether</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">31690</td>
			<td style="width:151px;">Caution Highly flammable/Harmful</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Triisopropylsilane (TIS)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">233781</td>
			<td style="width:151px;">Caution Irritant/Flammable</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Water, HPLC grade</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">270733</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="52">
			<td height="52" style="height:52px;width:140px;">Acetonitroile, HPLC grade (ACN)</td>
			<td style="width:123px;">Fisher Scientific</td>
			<td style="width:107px;">A998-4</td>
			<td style="width:151px;">Caution Flammable/Irritant/Harmful</td>
		</tr>
		<tr height="52">
			<td height="52" style="height:52px;width:140px;">N,N-Diisopropylethylamine (DIEA)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">3440</td>
			<td style="width:151px;">Caution Corrosive/Highly flammable</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Piperidine</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">W290807</td>
			<td style="width:151px;">Caution Toxic/Highly flammable</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Pyridine</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">270970</td>
			<td style="width:151px;">Caution Highly flammable/Harmful</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Ethanol (EtOH)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">459844</td>
			<td style="width:151px;">Caution Highly flammable/Irritant</td>
		</tr>
		<tr height="52">
			<td height="52" style="height:52px;width:140px;">1-Hydroxybenzotriazole hydrate (HOBt)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">157260</td>
			<td style="width:151px;">Caution Highly flammable/Irritant/Harmful</td>
		</tr>
		<tr height="86">
			<td height="86" style="height:86px;width:140px;">O-(Benzotriazol-1-yl)-N,N,N&#8242;,N&#8242;-tetramethyluronium hexafluorophosphate (HBTU)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">12804</td>
			<td style="width:151px;">Caution Irritant/Harmful</td>
		</tr>
		<tr height="86">
			<td height="86" style="height:86px;width:140px;">Benzotriazole-1-ly-oxy-tris-pyrrolidinophosphonium hexafluorphosphate (PyBOP)</td>
			<td style="width:123px;">Advanced Chemtech</td>
			<td style="width:107px;">RC8602</td>
			<td style="width:151px;">Caution Irritant</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Ninhydrin</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">454044</td>
			<td style="width:151px;">Caution Harmful</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Phenol</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">P3653</td>
			<td style="width:151px;">Caution Corrosive/Toxic</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Potassium cyanide (KCN)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">11813</td>
			<td style="width:151px;">Caution Very Toxic</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Potassium hydroxide (KOH)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">221473</td>
			<td style="width:151px;">Caution Toxic</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:140px;">N,N&#8217;-</td>
			<td rowspan="2" style="width:123px;">Sigma</td>
			<td rowspan="2" style="width:107px;">38370</td>
			<td rowspan="2" style="width:151px;">Caution Flammable/ Toxic</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Diisopropylcarbodiimide (DIC)</td>
		</tr>
		<tr height="52">
			<td height="52" style="height:52px;width:140px;">4-Dimethylaminopyridine (DMAP)</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">522805</td>
			<td style="width:151px;">Caution Toxic/Irritant</td>
		</tr>
		<tr height="52">
			<td height="52" style="height:52px;width:140px;">Glutaric anhydride</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">G3806</td>
			<td style="width:151px;">Caution Flammable/Irritant/Harmful</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Succinic anhydride</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">239690</td>
			<td style="width:151px;">Caution Irritant/Harmful</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Adipic acid</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">A26357</td>
			<td style="width:151px;">Caution Toxic/Irritant</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Pimelic acid</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">P45001</td>
			<td style="width:151px;">Caution Toxic/Irritant</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Chloranil</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">23290</td>
			<td style="width:151px;">Caution Toxic/Irritant</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Acetaldehyde</td>
			<td style="width:123px;">Sigma</td>
			<td style="width:107px;">402788</td>
			<td style="width:151px;">Caution Flammable/ Toxic</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;"></td>
			<td></td>
			<td></td>
			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:140px;">EQUIPMENT</td>
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			<td></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Name&#160;</td>
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			<td style="width:151px;">Comments</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Centrifuge</td>
			<td style="width:123px;">Beckman Coulter</td>
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			<td style="width:151px;"></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Lyophilizer</td>
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			<td style="width:151px;"></td>
		</tr>
		<tr height="95">
			<td height="95" style="height:95px;width:140px;">Vacuum pump</td>
			<td style="width:123px;">Franklin Electric</td>
			<td style="width:107px;">model 1101101416 with 3/4 HP</td>
			<td style="width:151px;">Alcatel pump with Franklin Motor&#160;</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Polypropylene cartridge 12 ml</td>
			<td style="width:123px;">Applied Separation</td>
			<td style="width:107px;">2419</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Cap plug for 12 ml polypropylene cartridge</td>
			<td style="width:123px;">Applied Separation</td>
			<td style="width:107px;">8157</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Polypropylene cartridge 3 ml</td>
			<td style="width:123px;">Applied Separation</td>
			<td style="width:107px;">2413</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Cap plug for 3 ml polypropylene cartridge</td>
			<td style="width:123px;">Applied Separation</td>
			<td style="width:107px;">8054</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Stop cocks PTFE</td>
			<td style="width:123px;">Applied Separation</td>
			<td style="width:107px;">2406</td>
			<td style="width:151px;"></td>
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		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Tubes flat, 50 ml</td>
			<td style="width:123px;">VWR</td>
			<td style="width:107px;">21008-240</td>
			<td style="width:151px;"></td>
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		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Extraction manifold, 20 pos, 16 x 100 mm tubes</td>
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			<td style="width:107px;">WAT200609</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Shaker, BD adams&#8482; nutator mixer</td>
			<td style="width:123px;">Fisher scientific</td>
			<td style="width:107px;">22363152</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="52">
			<td height="52" style="height:52px;width:140px;">Nalgene HDPE narrow mouth IP2 bottles, 125 ml</td>
			<td style="width:123px;">Fisher scientific</td>
			<td style="width:107px;">03-312-8</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Erlenmeyer flask</td>
			<td style="width:123px;">Fisher Scientific</td>
			<td style="width:107px;">FB-501, 500 ml</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Heating block</td>
			<td style="width:123px;">Thermolyne</td>
			<td style="width:107px;">1760 dri bath</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="52">
			<td height="52" style="height:52px;width:140px;">Disposable borosilicate glass tubes with plain end</td>
			<td style="width:123px;">Fisher Scientific</td>
			<td style="width:107px;">14-961-25</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Micropipettes and tips Finnpipette</td>
			<td style="width:123px;">Thermo</td>
			<td style="width:107px;">20&#8211;200 and 100&#8211;1,000 &#956;l</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">HPLC vials - micro vl pp 400 &#181;l PK100&#160;&#160;</td>
			<td style="width:123px;">VWR</td>
			<td style="width:107px;">69400-124</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">HPLC vial- Blue Snap-It Cap</td>
			<td style="width:123px;">VWR</td>
			<td style="width:107px;">66030-600</td>
			<td style="width:151px;"></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Analytical HPLC column</td>
			<td style="width:123px;">Peeke Scientific</td>
			<td style="width:107px;">U1-5C18Q-JJ</td>
			<td style="width:151px;">ultro 120 5 &#181;m C18Q, 4.6 mm ID 150 mm</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:140px;">Prep HPLC column, XBridge&#160;</td>
			<td style="width:123px;">Waters</td>
			<td style="width:107px;">OBD C18 5 &#181;m column</td>
			<td style="width:151px;">19 mm &#215; 150 mm</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:140px;">Mass spectrometer</td>
			<td style="width:123px;">Applied Biosystems</td>
			<td style="width:107px;">Voyager DE-RP&#160;</td>
			<td style="width:151px;"></td>
		</tr>
	</tbody>
</table>

development of a backbone cyclic peptide library as potential antiparasitic therapeutics using microwave irradiation

Protein-protein interactions (PPIs) are intimately involved in almost all biological processes and are linked to many human diseases. Therefore, there is a major effort to target PPIs in basic research and in the pharmaceutical industry. Protein-protein interfaces are usually large, flat, and often lack pockets, complicating the discovery of small molecules that target such sites. Alternative targeting approaches using antibodies have limitations due to poor oral bioavailability, low cell-permeability, and production inefficiency.
Using peptides to target PPI interfaces has several advantages. Peptides have higher conformational flexibility, increased selectivity, and are generally inexpensive. However, peptides have their own limitations including poor stability and inefficiency crossing cell membranes. To overcome such limitations, peptide cyclization can be performed. Cyclization has been demonstrated to improve peptide selectivity, metabolic stability, and bioavailability. However, predicting the bioactive conformation of a cyclic peptide is not trivial. To overcome this challenge, one attractive approach it to screen a focused library to screen in which all backbone cyclic peptides have the same primary sequence, but differ in parameters that influence their conformation, such as ring size and position.
We describe a detailed protocol for synthesizing a library of backbone cyclic peptides targeting specific parasite PPIs. Using a rational design approach, we developed peptides derived from the scaffold protein Leishmania receptor for activated C-kinase (LACK). We hypothesized that sequences in LACK that are conserved in parasites, but not in the mammalian host homolog, may represent interaction sites for proteins that are critical for the parasites&#39; viability. The cyclic peptides were synthesized using microwave irradiation to reduce reaction times and increase efficiency. Developing a library of backbone cyclic peptides with different ring sizes facilitates a systematic screen for the most biological active conformation. This method provides a general, fast, and facile way to synthesize cyclic peptides.

Here we describe the development of a focused small library of backbone cyclic peptides that specifically target vital PPIs of the Leishmania parasite and act as antiparasitic agents (for review about peptides that target PPIs as antiparasitic agents87). Through the synthesis of novel backbone cyclic peptides, pharmacophores are conserved in a scaffold of extendable size. The strength of the focused library proposed here is the ability to vary peptide scaffold sizes while allowing a restricted degree ...

Watch this Scientific Journal Video about Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation at JoVE.com

Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation

A simple and general method for the synthesis of cyclic peptides using microwave irradiation is outlined. This procedure enables the synthesis of backbone cyclic peptides with a collection of different conformations while retaining the side chains and the pharmacophoric moieties., and therefore, allows to screen for the bioactive conformation.

Protein-protein interactions (PPIs) are intimately involved in almost all biological processes and are linked to many human diseases. Therefore, there is ...

Research

JoVE Journal

Chemistry

Preparation of Silica Nanoparticles Through Microwave-assisted Acid-catalysis

Microwave-assisted synthetic techniques were used to quickly and reproducibly produce silica nanoparticle sols using an acid catalyst with nanoparticle ...

Split-and-pool Synthesis and Characterization of Peptide Tertiary Amide Library

Peptidomimetics are great sources of protein ligands. The oligomeric nature of these compounds enables us to access large synthetic libraries on solid ...

Real-time Monitoring of Reactions Performed Using Continuous-flow Processing: The Preparation of 3-Acetylcoumarin as an Example

By using inline monitoring, it is possible to optimize reactions performed using continuous-flow processing in a simple and rapid way. It is also possible ...

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

A standardized technique for atom transfer radical polymerization of vinyl monomers using perylene as a visible-light photocatalyst is presented. The ...

Peptide and Protein Quantification Using Automated Immuno-MALDI (iMALDI)

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Mass spectrometry (MS) is one of the most commonly used technologies for quantifying proteins in complex samples, with excellent assay specificity as a ...

Failure of Cleaning Verification in Pharmaceutical Industry Due to Uncleanliness of Stainless Steel Surface

The aim of this work is to identify the parameters that affect the recovery of pharmaceutical residues from the surface of stainless steel coupons. A ...

One-pot Microwave-assisted Conversion of Anomeric Nitrate-esters to Trichloroacetimidates

The goal of the following procedure is to provide a demonstration of the one-pot conversion of a 2-azido-1-nitrate-ester to a trichloroacetimidate ...

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

Cyclic voltammetry (CV) is a technique used in the analysis of organic compounds. When this technique is combined with electron paramagnetic resonance ...

Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines

Microwave-Assisted Preparation of 1-Aryl-1H-pyrazole-5-amines

A synthetic process for the preparation of a variety of 1-aryl-1H-pyrazole-5-amines was developed. The microwave-mediated nature of this method makes it ...

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

Heteroarylation introduces heteroaryl fragments to organic molecules. Despite the numerous available reactions reported for arylation via transition metal ...