We would like to acknowledge the NIH Common Fund &#8211; Protein Capture Reagents Program for funding the development of the Recombinant Antibody Network antibody selection and characterization pipeline and the Canadian Foundation for Innovation for funding purchase of the robotic selection platform.

1. Antigen Generation
NOTE:&#160; Antigen domains can be synthesized and cloned by a variety of commercial vendors into an appropriate IPTG-inducible expression construct.
<ol>
	<li>Transform expression constructs into chemically competent, T1-phage resistant, BL21 E. coli cells by mixing 10 ng of encoding DNA in 20&#160;&#181;l of 1X KCM on ice in a 96 well PCR plate followed by the addition of 20 L of chemically competent cells.</li>
	<li>Incubate the cell/DNA mixture on ice for 2...

<ol>
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When conducting in vitro antibody selections, the two primary determinants of selection success are 1) the isolation of well-folded antigenic targets for selecting upon and 2) the availability of a high functional diversity antibody library.&#160; In many cases, the availability of sufficient quantities of well-folded, full-length protein can be limiting.&#160; One approach to overcoming this limitation is to use domains identified from bioinformatic analysis22 and synthesized for insertion into a bac...

With the onset of the post-genomic age, the availability of high quality binding reagents to characterize and modulate proteins is essential to open new research and therapeutic avenues. Antibodies continue to be critical to both academic and industrial researchers as basic research and diagnostic tools and potential therapeutics. Not surprisingly, there has been an impressive growth of contract antibody development firms, most of which rely upon conventional hybridoma technologies to generate custom antibodies. Nevertheless, in vitro selection using phage-displayed antibody libraries is becoming a powerful alternative technology that can offer unique advantages and success where conventional technologies can face limitations1, 2.
In light of the considerable demand for high quality antibodies as research tools, two primary challenges for generating renewable antibodies are 1) selection throughput and 2) antigen availability. A number of groups have now described in vitro selection pipelines aimed at increasing throughput and the rate of antibody identification. These descriptions detail a variety of viable approaches that include selecting upon either full-length targets3,4, or structurally related domains5,6,7, using either bead-based6,8 or plate-based3,4 antigen immobilization schemes. In addition, the growing adoption of gene synthesis technologies9 has made systematic antigen generation, particularly of isolated domains, reasonably cost effective and can potentially alleviate the difficulty in obtaining sufficient quantities of purified, full-length antigen. By using the two technologies in tandem, a self-contained and scalable antigen generation and antibody selection pipeline was devised that would enable the parallel isolation of antibodies for large sets of expressed antigen domains and facilitate the development of reagents for characterizing entire classes of structurally or functionally related proteins.
Toward this aim, an integrated pipeline that couples in silico identification of expressible antigen domains, gene synthesis, high-throughput bacterial expression of antigens and scalable phage-displayed antibody selections has been developed. This pipeline requires only basic infrastructure available to most life science laboratories (including antibody libraries which are increasingly available through license or material transfer agreement), but is also amenable to automation for use on an industrial scale. Using this protocol, it is possible to generate hundreds of affinity-tagged antigen domains, and routinely isolate highly specific antibody fragments to many of these antigens.
Phage display technology has shown demonstrated compatibility with a wide variety of recombinant affinity reagent formats including Fab, scFv, and autonomous Fv domains and a growing array of small &#8216;alternative frameworks&#8217; (designed ankyrin repeat proteins (DARPINS), fibronectin (Fn), lipocalin domains and more10). Discussion is restricted in this example to the isolation of Fab antibody fragments, although it is presumed these methods can be adapted to other types of libraries.&#160; Using this technology, Fabs with low nanomolar affinity to small, tagged protein domains including transcription factor domains, SH2 domains, RNA-binding proteins and others have been successfully selected, many of which bind full-length protein and are functional in immunoassays such as immunofluorescence, immunoprecipitation and immunohistochemistry. Importantly, recombinant binding clones are fully renewable and can be re-generated from expression constructs via bacterial production offering increased consistency, reproducibility and cost-effectiveness, thus justifying the expense of rigorous clone validation.
In this protocol and accompanying video, basic methods for antibody selection from phage-displayed libraries using immobilized antigen domains are demonstrated. This particular method employs GST-tagged protein domains immobilized by passive adsorption in microwell plates, although other tags11,12,13 and selection formats13,14,2 have also been used successfully. Critical considerations for the setup and conduct of selections with parallel monitoring of selection parameters aimed at identifying and isolating specifically enriched clonal antibodies for validation are detailed.

<table border="0" cellpadding="0" cellspacing="0" width="470">
	<tbody>
		<tr height="22">
			<td colspan="4" height="22" style="height:22px;width:471px;">MATERIALS</td>
		</tr>
		<tr height="43">
			<td colspan="2" height="43" style="height:43px;width:249px;">Name</td>
			<td style="width:135px;">Company</td>
			<td style="width:87px;">Catalog Number</td>
		</tr>
		<tr height="40">
			<td colspan="2" height="40" style="height:40px;width:249px;">New Brunswick Innova44 stackable incubator shaker</td>
			<td style="width:135px;">Eppendorf</td>
			<td style="width:87px;">M1282-0004</td>
		</tr>
		<tr height="40">
			<td colspan="2" height="40" style="height:40px;width:249px;">Liquidator 96 channel manual benchtop pipetting system</td>
			<td style="width:135px;">Anachem Ltd</td>
			<td style="width:87px;">LIQ-96-200</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">Microplate shaker</td>
			<td style="width:135px;">VWR</td>
			<td style="width:87px;">12620-926</td>
		</tr>
		<tr height="40">
			<td colspan="2" height="40" style="height:40px;width:249px;">ThermoScientific Sorvall ST-40 benchtop centrifuge</td>
			<td style="width:135px;">Thermo Product</td>
			<td style="width:87px;">75004525</td>
		</tr>
		<tr height="40">
			<td colspan="2" height="40" style="height:40px;width:249px;">ELx405 Select Deep Well Microplate Washer</td>
			<td style="width:135px;">Biotek</td>
			<td>ELX405USD</td>
		</tr>
		<tr height="41">
			<td colspan="2" height="41" style="height:41px;width:249px;">Custom High Throughput Automated Phage Selection Robot</td>
			<td style="width:135px;">S&#38;P Robotics</td>
			<td style="width:87px;"></td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">Plastic conical Falcon tube: 50 mL</td>
			<td style="width:135px;">VWR</td>
			<td style="width:87px;">21008-178</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">Plastic conical Falcon tube: 15 mL</td>
			<td style="width:135px;">VWR</td>
			<td style="width:87px;">89039-668</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">Axygen 1.7 mL microcentrifuge tubes</td>
			<td style="width:135px;">Corning</td>
			<td style="width:87px;">MCT-175-L-C</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">96-well/384-well Maxisorp plate</td>
			<td style="width:135px;">Sigma</td>
			<td style="width:87px;">M9410-1CS</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">Corning 96-well V-bottom deep-well block</td>
			<td style="width:135px;">Corning</td>
			<td style="width:87px;">3960</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">Axygen Mini-tube 96-well sterile microplate blue box</td>
			<td style="width:135px;">Corning</td>
			<td style="width:87px;">AXY-MTS-06-C-R-S</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">Breathable adhesive plate sealing film</td>
			<td style="width:135px;">VWR</td>
			<td style="width:87px;">60941-084</td>
		</tr>
		<tr height="22">
			<td colspan="4" height="22" style="height:22px;width:471px;">REAGENTS</td>
		</tr>
		<tr height="43">
			<td colspan="2" height="43" style="height:43px;width:249px;">Name</td>
			<td style="width:135px;">Company</td>
			<td style="width:87px;">Catalog Number</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">polyethylene glycol</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">PEG800.1</td>
		</tr>
		<tr height="18">
			<td colspan="2" height="18" style="height:18px;">yeast extract</td>
			<td>Bioshop</td>
			<td>YEX401.1</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">bio-tryptone</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">TRP402.1</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">N-Z amine</td>
			<td style="width:135px;">Sigma</td>
			<td style="width:87px;">C7290</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">glucose</td>
			<td style="width:135px;">Sigma</td>
			<td style="width:87px;">G8270-1KG</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">lactose</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">LAC234</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">glycerol</td>
			<td style="width:135px;">Bioshop</td>
			<td>GLY001.500</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">carbenicillin&#160;</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">CAR544.10</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">kanamycin</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">KAN201.25</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">tetracycline&#160;</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">TET701.25</td>
		</tr>
		<tr height="43">
			<td colspan="2" height="43" style="height:43px;width:249px;">Tween 20</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">TWN510.500</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">monobasic potassium phophate</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">PPM302.1</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">dibasic sodium phosphate</td>
			<td style="width:135px;">Anachemia</td>
			<td style="width:87px;">84486-440</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">sodium chloride</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">SOD001.10</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">potassium chloride</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">POC308.1</td>
		</tr>
		<tr height="20">
			<td colspan="2" height="20" style="height:20px;width:249px;">calcium chloride</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">CCL302.500</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">magnesium sulphate</td>
			<td style="width:135px;">EMD</td>
			<td style="width:87px;">MX0070-1</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">magnesium chloride</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">MAG510.500</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">NH4Cl</td>
			<td style="width:135px;">Amresco</td>
			<td style="width:87px;">0621-1KG</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">Na2SO4</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">SOS513.500</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">agar</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">AGR001.500</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">SybrSafe DNA gel stain</td>
			<td style="width:135px;">Invitrogen</td>
			<td style="width:87px;">S33102</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">phosphoric acid</td>
			<td style="width:135px;">Acros Organics</td>
			<td style="width:87px;">201140010</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">lysozyme</td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">LYS702.25</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">benzonase</td>
			<td style="width:135px;">Novagen</td>
			<td style="width:87px;">71205</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:139px;">Triton X-100</td>
			<td style="width:111px;"></td>
			<td style="width:135px;">Bioshop</td>
			<td style="width:87px;">TRX506.500</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="21" style="height:21px;width:249px;">protease inhibitor cocktail tablets</td>
			<td style="width:135px;">Roche</td>
			<td style="width:87px;">11 836 170 001</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">Ni-NTA resin&#160;</td>
			<td style="width:135px;">Qiagen</td>
			<td style="width:87px;">1018240</td>
		</tr>
		<tr height="42">
			<td colspan="2" height="42" style="height:43px;width:249px;">1000x helper phage (M13K07) stock (1013 phage per mL)</td>
			<td style="width:135px;">NEB</td>
			<td style="width:87px;">N0315S</td>
		</tr>
		<tr height="21">
			<td colspan="2" height="39" rowspan="2" style="height:40px;width:249px;">HRP conjugated M13-specific antibody (anti-M13-HRP).</td>
			<td rowspan="2" style="width:135px;">GE Healthcare</td>
			<td rowspan="2" style="width:87px;">27-9241-01</td>
		</tr>
		<tr height="18">
		</tr>
		<tr height="44">
			<td colspan="2" height="44" style="height:44px;width:249px;">TMB substrate: mix equal volumes of TMB and H2O2 peroxidase substrate&#160;</td>
			<td style="width:135px;">KPL</td>
			<td style="width:87px;">50-76-00</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">dNTPs</td>
			<td style="width:135px;">Biobasic</td>
			<td style="width:87px;">DD0056</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">Taq polymerase</td>
			<td style="width:135px;">Genscript</td>
			<td style="width:87px;">E00007</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">Exonuclease</td>
			<td style="width:135px;">GE Healthcare&#160;</td>
			<td style="width:87px;">EZ0073X-EZ</td>
		</tr>
		<tr height="22">
			<td colspan="2" height="22" style="height:22px;width:249px;">Shrimp alkaline phosphatase</td>
			<td style="width:135px;">GE Healthcare</td>
			<td style="width:87px;">E70092Z-EZ</td>
		</tr>
	</tbody>
</table>

scalable high throughput selection from  phage-displayed synthetic antibody libraries

The demand for antibodies that fulfill the needs of both basic and clinical research applications is high and will dramatically increase in the future. However, it is apparent that traditional monoclonal technologies are not alone up to this task. This has led to the development of alternate methods to satisfy the demand for high quality and renewable affinity reagents to all accessible elements of the proteome. Toward this end, high throughput methods for conducting selections from phage-displayed synthetic antibody libraries have been devised for applications involving diverse antigens and optimized for rapid throughput and success. Herein, a protocol is described in detail that illustrates with video demonstration the parallel selection of Fab-phage clones from high diversity libraries against hundreds of targets using either a manual 96 channel liquid handler or automated robotics system. Using this protocol, a single user can generate hundreds of antigens, select antibodies to them in parallel and validate antibody binding within 6-8 weeks. Highlighted are: i) a viable antigen format, ii) pre-selection antigen characterization, iii) critical steps that influence the selection of specific and high affinity clones, and iv) ways of monitoring selection effectiveness and early stage antibody clone characterization. With this approach, we have obtained synthetic antibody fragments (Fabs) to many target classes including single-pass membrane receptors, secreted protein hormones, and multi-domain intracellular proteins. These fragments are readily converted to full-length antibodies and have been validated to exhibit high affinity and specificity. Further, they have been demonstrated to be functional in a variety of standard immunoassays including Western blotting, ELISA, cellular immunofluorescence, immunoprecipitation and related assays. This methodology will accelerate antibody discovery and ultimately bring us closer to realizing the goal of generating renewable, high quality antibodies to the proteome.

The protocol described herein has been used to isolate antibody fragments to a variety of both structurally- and functionally-related antigen domains from combinatorial phage-displayed Fab libraries in parallel.&#160; Issues related to antigen availability can be circumvented, in many cases, by in silico identification of expressible antigen domains that are suitable for antibody selection23.&#160; By coupling antigen expression to antibody selection within the same laboratory (Figure 1) it be...

Watch this Scientific Journal Video about Scalable High Throughput Selection From  Phage-displayed Synthetic Antibody Libraries at JoVE.com

Scalable High Throughput Selection From  Phage-displayed Synthetic Antibody Libraries

A method is described with visual accompaniment for conducting scalable, high throughput selections from phage-displayed combinatorial synthetic antibody libraries against hundreds of antigens simultaneously. Using this parallel approach, we have isolated antibody fragments that exhibit high affinity and specificity for diverse antigens that are functional in standard immunoassays.

The demand for antibodies that fulfill the needs of both basic and clinical research applications is high and will dramatically increase in the future. ...

Research

JoVE Journal

Immunology and Infection

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High-throughput Detection Method for Influenza Virus

Influenza virus is a respiratory pathogen that causes a high degree of morbidity and mortality every year in multiple parts of the world. Therefore, ...

Quantitative High-throughput Single-cell Cytotoxicity Assay For T Cells

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RNA viruses are responsible for major human diseases such as flu, bronchitis, dengue, Hepatitis C or measles. They also represent an emerging threat ...

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Growth dynamics are fundamental characteristics of microorganisms. Quantifying growth precisely is an important goal in microbiology. Growth dynamics are ...

High Yield Purification of Plasmodium falciparum Merozoites For Use in Opsonizing Antibody Assays

High Yield Purification of Plasmodium falciparum Merozoites For Use in Opsonizing Antibody Assays

Plasmodium falciparum merozoite antigens are under development as potential malaria vaccines. One aspect of immunity against malaria is the removal of ...

High-throughput Gene Tagging in Trypanosoma brucei

High-throughput Gene Tagging in Trypanosoma brucei

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Construction of Synthetic Phage Displayed Fab Library with Tailored Diversity

Demand for monoclonal antibodies (mAbs) in basic research and medicine is increasing yearly. Hybridoma technology has been the dominant method for mAb ...

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A High-throughput, High-content, Liquid-based C. elegans Pathosystem

The number of new drugs identified by traditional, in vitro screens has waned, reducing the success of this approach in the search for new weapons to ...

A High-throughput Shigella-specific Bactericidal Assay

A High-throughput Shigella-specific Bactericidal Assay

Serum bactericidal assays (SBAs) measure the functional activity of antibodies and have been used for many decades. SBAs directly measure antibody killing ...