Name: overexpression and purification of human cis-prenyltransferase in escherichia coli
Uploaded: 2017-08-03T15:00:00
Description: Watch this Scientific Journal Video about Overexpression and Purification of Human Cis-prenyltransferase in Escherichia coli at JoVE.com

Este trabajo fue financiado por el Centro para la Excelencia en Investigación de la Fundación Israelí de Ciencias (I-CORE) en Biología de las Células Estructurales (1775/12) y la Fundación Israel de Ciencia otorga 1721/16 y 2338/16 (YH), ​​y 825/14 (DK ). El apoyo de la Fundación Fields Estate a DK es muy apreciado. Este trabajo fue realizado por Ilan Edri y Michal Goldenberg en el cumplimiento parcial de los requisitos de la tesis MD de la Facultad de Sackler de Medicina, Universidad de Tel Aviv.

1. Clonación de cis- TP para sobreexpresión en E. coli <ol><li> Obtener el vector de expresión pET-32b, diseñado para la clonación y de alto nivel de expresión de las secuencias de proteínas fusionadas con la proteína 109aa tiorredoxina (TRX) 17, y E. coli con codones optimizados 18 secuencia de longitud completa -PT cis codificación. </li><li> Tener cuidado de tener un TEV-proteasa (tabaco proteasa del virus etch) sitio de es...

<ol>
	<li>Grabinska, K. A., Park, E. J., Sessa, W. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=cis-Prenyltransferase:+New+Insights+into+Protein+Glycosylation,+Rubber+Synthesis,+and+Human+Diseases.">cis-Prenyltransferase: New Insights into Protein Glycosylation, Rubber Synthesis, and Human Diseases.</a> J Biol Chem. 291 (35), 18582-18590 (2016).</li><li>Ogura, K., Koyama, T., Sagami, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Polyprenyl+diphosphate+synthases.">Polyprenyl diphosphate synthases.</a> Subcell Biochem. 28, 57-87 (1997).</li><li>Ogura, K., Koyama, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Enzymatic+Aspects+of+Isoprenoid+Chain+Elongation.">Enzymatic Aspects of Isoprenoid Chain Elongation.</a> Chem Rev. 98 (4), 1263-1276 (1998).</li><li>Imperiali, B., O'Connor, S. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effect+of+N-linked+glycosylation+on+glycopeptide+and+glycoprotein+structure.">Effect of N-linked glycosylation on glycopeptide and glycoprotein structure.</a> Curr Opin Chem Biol. 3 (6), 643-649 (1999).</li><li>Bukhtiyarov, Y. E., Shabalin, Y. A., Kulaev, I. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Solubilization+and+characterization+of+dehydrodolichyl+diphosphate+synthase+from+the+yeast+Saccharomyces+carlsbergensis.">Solubilization and characterization of dehydrodolichyl diphosphate synthase from the yeast Saccharomyces carlsbergensis.</a> J Biochem. 113 (6), 721-728 (1993).</li><li>Adair, W. L., Cafmeyer, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Characterization+of+the+Saccharomyces+cerevisiae+cis-prenyltransferase+required+for+dolichyl+phosphate+biosynthesis.">Characterization of the Saccharomyces cerevisiae cis-prenyltransferase required for dolichyl phosphate biosynthesis.</a> Arch Biochem Biophys. 259 (2), 589-596 (1987).</li><li>Zelinger, L., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+missense+mutation+in+DHDDS,+encoding+dehydrodolichyl+diphosphate+synthase,+is+associated+with+autosomal-recessive+retinitis+pigmentosa+in+Ashkenazi+Jews.">A missense mutation in DHDDS, encoding dehydrodolichyl diphosphate synthase, is associated with autosomal-recessive retinitis pigmentosa in Ashkenazi Jews.</a> Am J Hum Genet. 88 (2), 207-215 (2011).</li><li>Zuchner, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Whole-exome+sequencing+links+a+variant+in+DHDDS+to+retinitis+pigmentosa.">Whole-exome sequencing links a variant in DHDDS to retinitis pigmentosa.</a> Am J Hum Genet. 88 (2), 201-206 (2011).</li><li>Tropea, J. E., Cherry, S., Waugh, D. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Expression+and+purification+of+soluble+His(6)-tagged+TEV+protease.">Expression and purification of soluble His(6)-tagged TEV protease.</a> Methods Mol Biol. 498, 297-307 (2009).</li><li>Crouse, G. F., Frischauf, A., Lehrach, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+integrated+and+simplified+approach+to+cloning+into+plasmids+and+single-stranded+phages.">An integrated and simplified approach to cloning into plasmids and single-stranded phages.</a> Methods Enzymol. 101, 78-89 (1983).</li><li>Middelberg, A. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Process-scale+disruption+of+microorganisms.">Process-scale disruption of microorganisms.</a> Biotechnol Adv. 13 (3), 491-551 (1995).</li><li>Block, H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Immobilized-metal+affinity+chromatography+(IMAC):+a+review.">Immobilized-metal affinity chromatography (IMAC): a review.</a> Methods Enzymol. 463, 439-473 (2009).</li><li>Sachyani, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Structural+basis+of+a+Kv7.1+potassium+channel+gating+module:+studies+of+the+intracellular+c-terminal+domain+in+complex+with+calmodulin.">Structural basis of a Kv7.1 potassium channel gating module: studies of the intracellular c-terminal domain in complex with calmodulin.</a> Structure. 22 (11), 1582-1594 (2014).</li><li>Shuart, N. G., Haitin, Y., Camp, S. S., Black, K. D., Zagotta, W. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Molecular+mechanism+for+3:1+subunit+stoichiometry+of+rod+cyclic+nucleotide-gated+ion+channels.">Molecular mechanism for 3:1 subunit stoichiometry of rod cyclic nucleotide-gated ion channels.</a> Nat Commun. 2, 457 (2011).</li><li>Chang, S. Y., Tsai, P. C., Tseng, C. S., Liang, P. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Refolding+and+characterization+of+a+yeast+dehydrodolichyl+diphosphate+synthase+overexpressed+in+Escherichia+coli.">Refolding and characterization of a yeast dehydrodolichyl diphosphate synthase overexpressed in Escherichia coli.</a> Protein Expr Purif. 23 (3), 432-439 (2001).</li><li>Chang, S. Y., Ko, T. P., Liang, P. H., Wang, A. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Catalytic+mechanism+revealed+by+the+crystal+structure+of+undecaprenyl+pyrophosphate+synthase+in+complex+with+sulfate,+magnesium,+and+triton.">Catalytic mechanism revealed by the crystal structure of undecaprenyl pyrophosphate synthase in complex with sulfate, magnesium, and triton.</a> J Biol Chem. 278 (31), 29298-29307 (2003).</li><li>Guo, R. T., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Crystal+structures+of+undecaprenyl+pyrophosphate+synthase+in+complex+with+magnesium,+isopentenyl+pyrophosphate,+and+farnesyl+thiopyrophosphate:+roles+of+the+metal+ion+and+conserved+residues+in+catalysis.">Crystal structures of undecaprenyl pyrophosphate synthase in complex with magnesium, isopentenyl pyrophosphate, and farnesyl thiopyrophosphate: roles of the metal ion and conserved residues in catalysis.</a> J Biol Chem. 280 (21), 20762-20774 (2005).</li><li>Collins, F. S., Green, E. D., Guttmacher, A. E., Guyer, M. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+vision+for+the+future+of+genomics+research.">A vision for the future of genomics research.</a> Nature. 422 (6934), 835-847 (2003).</li><li>Freeze, H. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Understanding+human+glycosylation+disorders:+biochemistry+leads+the+charge.">Understanding human glycosylation disorders: biochemistry leads the charge.</a> J Biol Chem. 288 (10), 6936-6945 (2013).</li><li>LaVallie, E. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+thioredoxin+gene+fusion+expression+system+that+circumvents+inclusion+body+formation+in+the+E.+coli+cytoplasm.">A thioredoxin gene fusion expression system that circumvents inclusion body formation in the E. coli cytoplasm.</a> Biotechnology (N Y). 11 (2), 187-193 (1993).</li><li>Elena, C., Ravasi, P., Castelli, M. E., Peiru, S., Menzella, H. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Expression+of+codon+optimized+genes+in+microbial+systems:+current+industrial+applications+and+perspectives.">Expression of codon optimized genes in microbial systems: current industrial applications and perspectives.</a> Front Microbiol. 5, 21 (2014).</li><li>Vincentelli, R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High-throughput+protein+expression+screening+and+purification+in+Escherichia+coli.">High-throughput protein expression screening and purification in Escherichia coli.</a> Methods. 55 (1), 65-72 (2011).</li></ol>

El protocolo descrito aquí para la purificación de DHDDS humano funcional en células de E. coli es simple y eficiente, permitiendo una sobreexpresión y purificación de la proteína en 3 - 4 días una vez que se dispone de una construcción adecuada. Tales protocolos para la purificación de proteínas son de especial importancia dado los avances en la secuenciación del genoma, que proporcionó gran cantidad de información sobre la genética de muchas enfermedades [ 18] , lo que re...

Las preniltransferasas son un grupo de enzimas que catalizan el alargamiento de la cadena del difosfato alílico usando difosfato de isopentenilo (IPP) a través de múltiples reacciones de condensación 1 , 2 . Enzimas de tipo Z catalizan la formación de dobles enlaces cis de la reacción de condensación, mientras que las enzimas de tipo E catalizan la formación de trans doble enlace 3. Las cis- priltransferasas (enzimas cis -PT, tipo Z) se clasifican clásicamente de acuerdo con la longitud de su cadena de productos en cadenas cortas (C 15 ), de cadena media (C 50-55 ) y de cadena larga (C 70-120 ) 4 . El DHDDS (deshidrodolichil difosfato sintasa) es un cis- PT de cadena larga eucariótico que cataliza el alargamiento de la cadena del difosfato de farnesilo (FPP, un difosfato alílico) a través de múltiples condensaciones con isopentenil difosfato (IPP) 1, 5 , 6 . Esto da como resultado la formación de difosfato de deshidrodolicilo, difosfato de polifenilo C 55-100 que sirve como precursor para dolicilpirofosfato, la molécula portadora de glicosilo implicada en la glicosilación de proteínas ligadas al N 1 . Entre los judíos asquenazíes, una mutación no conservadora de sentido erróneo (K42E) en DHDDS da lugar a la retinitis pigmentosa autosómica recesiva 7 , 8 . Por lo tanto, el presente protocolo se desarrolló con el fin de adquirir DHDDS purificado adecuado para estudios mecánicos. Escherichia coli se considera el huésped más conveniente y rentable para la expresión de la proteína recombinante, y por lo tanto es también el huésped más frecuentemente utilizado. Sin embargo, cuando se intenta heterólogamente sobreexpresar proteínas en E. coli , se deben tomar consideraciones específicas de proteínas. Obtener correctamente doblado, activE las proteínas recombinantes de E. coli , no es una cuestión sencilla debido a las distintas propiedades de diferentes proteínas. Se han desarrollado numerosos enfoques para superar estos obstáculos. En este caso, se utilizó el uso de fusión de proteínas, condiciones de cultivo optimizadas y optimización de codones para permitir la sobreexpresión y purificación de DHDDS humanos funcionalmente activos en E. coli . De nota, un intento previo de sobreexpresar levadura cis- TP sin fusión de proteínas no fue exitosa debido a la insolubilidad completa, incluso en presencia de detergente [ 12] . El protocolo descrito es simple, rentable, ahorrador de tiempo y permite obtener preparados de DHDDS adecuados para estudios mecánicos. Dada la homología de cis -PT entre diferentes especies, sugerimos que este protocolo se puede aplicar para otros eucarióticos cis- TP también.

<table width="751">
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		<col />
		<col />
		<col />
		<col />
	</colgroup>
	<tbody>
		<tr height="21">
			<td height="21" style="width:365px;height:21px;">pET-32b</td>
			<td style="width:100px;">Novagen</td>
			<td style="width:119px;">69016-3</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">T7 Express&#160;lysY&#160;Competent&#160;E. coli&#160;(High Efficiency)</td>
			<td style="width:100px;">NEB</td>
			<td>C3010I</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="width:365px;height:42px;">cOmplete, EDTA-free Protease Inhibitor Cocktail</td>
			<td style="width:100px;">Roche</td>
			<td style="width:119px;">11873580001</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">TALON-superflow resin</td>
			<td style="width:100px;">GE Healthcare</td>
			<td>28-9574-99</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">HiPrep 26/10 desalting column&#160;</td>
			<td style="width:100px;">GE Healthcare</td>
			<td>17508701</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">HiLoad 16/60 superdex-200&#160;</td>
			<td style="width:100px;">GE Healthcare</td>
			<td>28989335</td>
			<td></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">superdex-200 increase 5/150 GL&#160;</td>
			<td style="width:100px;">GE Healthcare</td>
			<td>28990945</td>
			<td></td>
		</tr>
		<tr height="24">
			<td height="24" style="height:24px;">14C-Isopentenyl pyrophosphate</td>
			<td style="width:100px;">Perkin-Elmer</td>
			<td>NEC773050UC&#160;</td>
			<td></td>
		</tr>
		<tr height="21">
			<td height="21" style="width:365px;height:21px;">trans,trans-Farnesyl pyrophosphate</td>
			<td style="width:100px;">Sigma</td>
			<td>44270-10MG</td>
			<td></td>
		</tr>
	</tbody>
</table>

overexpression and purification of human cis-prenyltransferase in escherichia coli

Las preniltransferasas (PT) son un grupo de enzimas que catalizan el alargamiento de la cadena del difosfato alílico usando difosfato de isopentenilo (IPP) a través de múltiples reacciones de condensación. El DHDDS (deshidrodolicil difosfato sintasa) es un cis- PT (que forma enlaces dobles cis de la reacción de condensación) eucariótico que cataliza el alargamiento de la cadena del difosfato de farnesilo (FPP, difosfato alílico) a través de múltiples condensaciones con isopentenil difosfato (IPP). DHDDS es de importancia biomédica, como una mutación no conservadora (K42E) en la enzima resulta en la retinitis pigmentosa , en última instancia, conduce a la ceguera. Por lo tanto, el presente protocolo se desarrolló con el fin de adquirir grandes cantidades de DHDDS purificado, adecuado para estudios mecánicos. En este caso, se utilizó el uso de fusión de proteínas, condiciones de cultivo optimizadas y optimización de codones para permitir la sobreexpresión y purificación de DHDDS humanos funcionalmente activos en <eM&gt; E. Coli El protocolo descrito es simple, rentable y ahorrador de tiempo. La homología de cis -PT entre diferentes especies sugiere que este protocolo se puede aplicar para otros eucariotas cis- TP, así como los que participan en la síntesis de caucho natural.

En la Figura 1 se muestra la descripción general del constructo utilizado y el proceso de purificación. Las muestras obtenidas en cada etapa de purificación se muestran en la Figura 2 . Este análisis de SDS-PAGE muestra la purificación por etapas de DHDDS, dando como resultado un producto altamente purificado. La Figura 3 muestra los resultados de la SEC analítica de la enzima purificada, reve...

Watch this Scientific Journal Video about Overexpression and Purification of Human Cis-prenyltransferase in Escherichia coli at JoVE.com

Overexpression and Purification of Human Cis-prenyltransferase in Escherichia coli

Un protocolo simple para la sobreexpresión y purificación de la cis- preniltransferasa humana optimizada con codones, en condiciones no desnaturalizantes, de Escherichia Coli , junto con un ensayo de actividad enzimática. Este protocolo puede generalizarse para la producción de otras proteínas de cis- preniltransferasa en cantidad y calidad adecuadas para estudios mecánicos.

Sobreexpresión y Purificación de Humanos<em&gt; Cis</em&gt; -preniltransferasa en<em&gt; Escherichia coli</em

Prenyltransferases (PT) are a group of enzymes that catalyze chain elongation of allylic diphosphate using isopentenyl diphosphate (IPP) via multiple ...

The overall goal of this protocol is to overexpress and purify codon-optimized human cis-prenyltransferase under non-denaturing conditions and to assay its enzymatic activity. The procedure is demonstrated with the eukaryotic long-chain cis-prenyltransferase dehydrodolichyl diphosphate synthase, or DHDDS. This method can advance our understanding of isoprenoid synthesis and provide key insights into the pathophysiological mechanism of retinitis pigmentosa related to mutations in DHDDS.The main advantages of this technique is that it's simple, cost-effective, and time-saving. It also can be generalized for high-quantity production of other cis-prenyltransferase proteins. Begin this procedure with cloning an expression of human DHDDS, as described in the text protocol.Resuspend the cells in buffer A, one microgram per milliliter of DNase I, and a protease inhibitor mixture. Then, homogenize the resuspended cells using a glass Teflon homogenizer. Disrupt the cells with a Microfluidizer or equivalent at 12, 000 to 15, 000 psi.Next, centrifuge the cell lysate at 40, 000 times g for 45 minutes at four degrees Celsius. Recover the supernatant containing the soluble fraction. Load the supernatant onto a five to 10 millimeter cobalt-immobilized metal affinity chromatography column with 10 millimolar imidazole.After loading into a fast protein liquid chromatography machine, perform a thorough washing of the column with buffer A in 10 millimolar imidazole in order to reduce non-specific protein binding. Begin the FPLC program. Elute the overexpressed proteins with buffer A supplemented with 250 millimolar imidazole.Following elution, remove the imidazole using 53 milliliters of a preparative desalting column equilibrated with buffer A.Then, add hexahistidine-tagged TEV protease to the eluted proteins to remove their hexahistidine-tagged thioredoxin DHDDS fusion. Incubate the mixture at four degrees Celsius overnight. Next, load the cleaved proteins onto a cobalt-immobilized metal affinity chromatography column equilibrated with buffer A supplemented with five millimolar imidazole.Collect the flowthrough to remove the cleaved hexahistidine-tagged thioredoxin and TEV protease. Concentrate the flowthrough to between three and four milliliters using a 30 kilodalton molecular weight cut off centrifugal filter. Then, load the concentrated protein onto a Superdex 200 size exclusion chromatography column equilibrated with buffer A for final purification.Place the samples into a 96-well rack in a fraction collector. The protein elutes as a dimer. Select relevant fractions by comparing the elution profile to a column calibration curve.At this point, assess the purity of the preparation using SDS-PAGE. Finally, determine the protein concentration needed for downstream experimentation and flash freeze aliquots of purified concentrated proteins in liquid nitrogen. Store the aliquots at minus 80 degrees Celsius until use.To ensure the ability of the protein to endure freeze-thaw cycles, thaw an aliquot of the frozen proteins. Centrifuge the aliquot at 21, 000 times g for 10 minutes to remove insoluble aggregates. Following centrifugation, collect the supernatant.Next, load the proteins onto a Superdex 200 analytical column pre-equilibrated with TNXB using an ultra performance liquid chromatography system. Monitor the tryptophan fluorescence to detect the protein's elution profile. Be sure to have a valid calibration curve for molecular weight assessment, which is available via the SEC column manufacturers.To ensure the activity of the purified protein, first mix five micromolar of purified DHDDS with 10 micromolar FPP and 50 micromolar C14 IPP. Initiate the reaction in buffer A with 0.5 millimolar magnesium chloride at 22 to 30 degrees Celsius. Withdraw 15 microliter samples from the reaction at zero, two, four, and six hours following immediate quenching of the reaction by the addition of 15 microliters of buffer A supplemented with 20 millimolar EDTA.Then, add one milliliter of water-saturated 1-butanol and vortex thoroughly to extract the reaction products. The protocol can be stopped here, and the samples can be kept for later reading. Next, add the scintillation cocktail to the samples.Using a scintillation counter, quantitate reaction products in the butanol phase encompassing C14 together with radioactivity of 15 microliters of the reaction, representing the total radioactivity. Finally, calculate the net C14 IPP incorporation at each time point by calculating the percent utilized from the total C14 IPP concentrations and plot the results as a function of time. An increase in the net C14 IPP incorporation is expected with time.The samples obtained at each purification step are shown here. This SDS-PAGE analysis shows the stepwise purification of DHDDS, resulting in a highly-purified product. This chromatogram represents the results of analytical size exclusion chromatography of the purified enzyme, revealing that the protein is only observed as a homodimer.Here, the arrow indicates the void volume. A representative time-dependent activity assay reveals that C14 IPP incorporation clearly rises over six hours, verifying that the purified enzyme is functional. Once mastered, this simple preparation can be done in two to three days, resulting in a highly pure and active enzyme.After watching this video, you should have a good understanding of how to overexpress and purify human cis-prenyltransferase from E.coli and to measure its activity in a time-dependent manner.

Research

JoVE Journal

Immunology and Infection

Overexpression and Purification of Human Cis-prenyltransferase in Escherichia coli

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Expansión, purificación y evaluación funcional de la sangre periférica humana células NK

Natural killer (NK) cells play an important role in immune surveillance against a variety of infectious microorganisms and tumors. Limited availability of ...

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De un solo paso negativo Purificación cromatográfica de<em&gt; Helicobacter pylori</em&gt; La proteína activadora de neutrófilos sobreexpresa en<em&gt; Escherichia coli</em&gt; En modo batch

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Análisis de citometría de flujo de las células asesinas naturales lítico Actividad en sangre entera humana

NK cell cytotoxicity is a widely used measure to determine the effect of outside intervention on NK cell function. However, the accuracy and ...

Detection of Enterohemorrhagic Escherichia Coli Colonization in Murine Host by Non-invasive In Vivo Bioluminescence System

Detection of Enterohemorrhagic Escherichia Coli Colonization in Murine Host by Non-invasive In Vivo Bioluminescence System

Detección de la colonización de Escherichia Coli enterohemorrágica en anfitrión murino no invasiva In Vivo el sistema de bioluminiscencia

Enterohemorrhagic E. coli (EHEC) O157:H7, which is a foodborne pathogen that causesdiarrhea, hemorrhagic colitis (HS), and hemolytic uremic syndrome ...

Creation of a Dense Transposon Insertion Library Using Bacterial Conjugation in Enterobacterial Strains Such As Escherichia Coli or Shigella flexneri

Creation of a Dense Transposon Insertion Library Using Bacterial Conjugation in Enterobacterial Strains Such As Escherichia Coli or Shigella flexneri

Creación de un denso Transposon inserción biblioteca usando Conjugación bacteriana en cepas enterobacterianas tales como Escherichia Coli o Shigella flexneri

Transposon mutagenesis is a method that allows gene disruption via the random genomic insertion of a piece of DNA called a transposon. The protocol below ...

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

A Facile Protocol to Generate Site-Specifically Acetylated Proteins in Escherichia Coli

Un protocolo fácil de generar proteínas Site-Specifically acetiladas en Escherichia Coli

Post-translational modifications that occur at specific positions of proteins have been shown to play important roles in a variety of cellular processes. ...