Name: one-step negative chromatographic purification of helicobacter pylori neutrophil-activating protein overexpressed in escherichia coli in batch mode
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We thank Dr. Chao-Sheng Cheng at National Tsing Hua University, Taiwan, for performing the circular dichroism measurement. We also thank Drs. Evanthia Galanis and Ianko D. Iankov at Mayo Clinic, USA, for providing the anti-HP-NAP monoclonal antibody. We appreciate Drs. Han-Wen Chang and Chung-Chu Chen at Mackay Memorial Hospital, Hsinchu, Taiwan, for providing advice for IRB application, Mr. Te-Lung Tsai at the Mackay Memorial Hospital, Hsinchu, Taiwan, for supervising the analysis of isolated neutrophils, and Ms. Ju-Chen Weng at National Tsing Hua University, Taiwan, for her technical assistance. This work was supported by grants from the Ministry of Science and Technology of Taiwan (MOST 104-2311-B-007-003, NSC101-2311-B-007-007 and NSC98-2311-B-007-006-MY3), the Joint Research Program of National Tsing Hua University and Mackay Memorial Hospital (100N7727E1, 101N2727E1, 103N2773E1), and the research program of National Tsing Hua University (104N2052E1).

Le sang humain a été recueilli chez des volontaires sains avec le consentement écrit préalable éclairé et l&#39;approbation du Conseil institutionnel d&#39;examen de la National Tsing Hua University, Hsinchu, Taiwan. 1. Expression du recombinant HP-NAP dans E. coli <ol><li> Préparer le plasmide pET42a-PNA contenant la séquence d&#39;ADN de la HP-NAP de H. pylori 26695 souche comme décrit précédemment 16. Préparer les plasmides contenant la séquence d&#39;ADN de la HP-N...

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La Chromatographie discontinue en mode négatif par DEAE résines échangeuses d&#39; anions présenté ici est approprié pour la purification de HP-NAP recombinante surexprimée dans E. coli. Les valeurs de pH des tampons utilisés dans les étapes de lyse des cellules et la purification sont très critiques pour assurer la solubilité du HP-NAP dans E. Les lysats coli et une séparation efficace de HP-NAP recombinante à partir d&#39; impuretés de cellules hôtes, respectivement. Les cellu...

Helicobacter pylori (H. pylori) est une cause majeure de la gastrite et de l&#39; ulcère gastro - duodénal. Cette bactérie a également été classé comme cancérogène chez l&#39; homme par le Centre international de recherche sur le cancer, une partie de l&#39;Organisation mondiale de la Santé, en 1994. Il a été estimé que la prévalence de H. infection pylori est de 70% dans les pays en développement et 30-40% dans les pays industrialisés 1. Même si le taux de H. infection pylori diminue dans les pays industrialisés, le taux de H. infection pylori dans les pays en développement est encore élevé 2. Le traitement standard pour l&#39; éradication de H. pylori infection consiste en l&#39;administration d&#39;un inhibiteur de la pompe à protons, IPP et deux antibiotiques, la clarithromycine ou le métronidazole et amoxicilline 3. Toutefois, l&#39;augmentation de la résistance aux antibiotiques chez H. pylori la PI thérapie de l&#39; ulcère exhorte le développement de nouvelles stratégies pour prévenir or guérir l&#39;infection. Développement de la vaccination prophylactique et / ou thérapeutique contre H. pylori pourrait fournir une approche alternative pour contrôler H. infection pylori. Helicobacter pylori protéine d&#39; activation des neutrophiles (HP-NAP), un facteur de virulence majeur de H pylori, a été identifié dans les extraits d&#39;eau de H. pylori avec la possibilité d&#39;activer les neutrophiles adhérer aux cellules endothéliales et produire des espèces réactives de l&#39; oxygène (ROS) 4. L&#39; infiltration des neutrophiles de la muqueuse gastrique trouvée dans H. pylori patients infectés par gastrite active peuvent provoquer une inflammation et des dommages aux tissus de l&#39;estomac. Ainsi, HP-NAP peut jouer un rôle pathologique par l&#39; activation des neutrophiles pour induire une inflammation de l&#39; estomac, ce qui provoque en outre l&#39; ulcère ou H. pylori -Associated maladies gastriques. Néanmoins, HP-NAP est un candidat potentiel pour des applications cliniques 5,6. En raison de la pro immunogène et immunomodulateurspriétés de HP-NAP, cette protéine pourrait être utilisée pour développer des vaccins, des agents thérapeutiques et des outils de diagnostic. Un essai clinique a été mené à l&#39; aide de HP-NAP recombinante comme l&#39; un des composants d&#39;un vaccin contre la protéine H. pylori. Ce vaccin se compose de HP-NAP recombinant associé à la cytotoxine gène A (CagA), et des protéines Une cytotoxine vacuolisante (VacA) formulé avec de l&#39; hydroxyde d&#39;aluminium et il a en outre été démontrée comme étant sans danger et immunogène chez l&#39;être humain 7. En outre, HP-NAP agit comme un immunomodulateur puissant pour déclencher T auxiliaires de type 1 (Th1) multipolarisé réponses immunitaires pour le traitement du cancer et de 8 à réguler à la baisse des réponses immunitaires médiées par Th2 induites par des réactions allergiques et d&#39; infections parasitaires 9,10. En ce qui concerne le diagnostic recombinant ELISA basé sur HP-NAP a été appliqué pour détecter des anticorps sériques contre la HP-NAP de H. pylori patients infectés par le 11. Une étude a montré que le niveau d&#39;anticorps spécifiques HP-NAP dans le sérum de H. pylori patients infectés par le cancer gastrique était significativement plus élevé que chez les patients souffrant de gastrite chronique 12. Une autre étude a également montré que les anticorps sériques dirigés contre HP-NAP sont associées à la présence de non-cardia 13 adénocarcinomes gastriques. Ainsi, recombinant ELISA à base de HP-NAP peut être appliqué pour détecter les anticorps sériques dirigés contre HP-NAP pour le pronostic du cancer gastrique chez H. pylori patients infectés par l . Pris ensemble, le HP-NAP purifiée pourrait encore être utilisé pour la prévention, le traitement et le pronostic de H. pylori -Associated maladies, ainsi que la thérapie du cancer. Parmi les différentes méthodes utilisées pour la purification de recombinant HP-NAP exprimé dans Escherichia coli (E. coli) sous sa forme native rapporté jusqu&#39;à présent, une chromatographie sur gel de filtration deuxième étape de purification impliquant est nécessaire pour obtenir de haute pureté HP-NAP 14-16 . Ici, une méthode utilisant la chromatographie négative mode batch avecdiéthylaminoéthyle (DEAE) résines échangeuses d&#39; ions est décrit pour la purification de HP-NAP surexprimé dans E. coli avec un rendement élevé et une grande pureté. Cette technique de purification a été basée sur la liaison des protéines et / ou des impuretés autres que HP-NAP à la résine cellule hôte. A pH 8,0, presque pas d&#39;autres protéines à l&#39;exception de HP-NAP sont récupérés à partir de la fraction non liée. Cette approche de purification utilisant la chromatographie par échange d&#39;ions DEAE en mode négatif est simple et économiser en permettant la purification de HP-NAP recombinante par Chromatographie en une seule étape par la collecte de la fraction non liée du temps. En plus de HP-NAP, plusieurs autres biomolécules, tels que les virus 17, immunoglobuline G (IgG) 18, l&#39; hémoglobine 19, la protéine phosphatase 20, et le facteur de virulence flagelline 21, ont également été rapportés d&#39;être purifiée par chromatographie échangeuse d&#39; ions en négatif mode. Le mode négatif est préféré pour la chromatographie échangeuse d&#39;ions, si des impuretés sont mineuresles composants présents dans l&#39;échantillon soumis à purifier 22. L&#39;application de la chromatographie négative dans la purification de biomolécules naturelles ou recombinantes a été récemment examiné 23. Le présent rapport fournit une étape par le protocole d&#39;étape pour l&#39; expression de HP-NAP recombinante dans E. coli, la lyse des cellules et la purification de HP-NAP utilisant une Chromatographie en discontinu en mode négatif par DEAE résines échangeuses d&#39; ions. Si une protéine souhaitée pour la purification est adaptée à la chromatographie d&#39;échange d&#39;ions en mode négatif, le protocole décrit pourrait également être adapté comme point de départ pour le développement d&#39;un procédé de purification.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>Material</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>pET42a-NAP&#160;</td>
			<td>N/A</td>
			<td>N/A</td>
			<td>prepared as described in Supplementary data of Refernce 15&#160; 
			http://www.sciencedirect.com/science/article/pii/S0006291X08018317</td>
		</tr>
		<tr>
			<td>E. coli BL21 (DE3)</td>
			<td>Thermo Fisher Scientific Inc</td>
			<td>C6000-03</td>
			<td>https://www.thermofisher.com/order/catalog/product/C600003</td>
		</tr>
		<tr>
			<td>Kanamycin</td>
			<td>Amresco</td>
			<td>25389-94-0</td>
			<td>http://www.amresco-inc.com/KANAMYCIN-SULFATE-0408.cmsx</td>
		</tr>
		<tr>
			<td>Isopropyl &#946;-D-1-thiogalactopyranoside (IPTG)</td>
			<td>MD Biomedical Inc</td>
			<td>101-367-93-1</td>
			<td>http://www.antibody-antibodies.com/product_det.php?id=238064&#38;supplier=search&#38;name =IPTG%20</td>
		</tr>
		<tr>
			<td>phenylmethylsulfonyl fluoride (PMSF)</td>
			<td>Sigma-Aldrich</td>
			<td>10837091001</td>
			<td>protease inhibitor 
			http://www.sigmaaldrich.com/catalog/product/roche/PMSFRO?lang=en&#38;region=TW</td>
		</tr>
		<tr>
			<td>N-alpha-tosyl-L-lysinyl-chloromethylketone (TLCK)</td>
			<td>Sigma-Aldrich</td>
			<td>T7254</td>
			<td>protease inhibitor 
			http://www.sigmaaldrich.com/catalog/product/sigma/t7254?lang=en&#38;region=TW</td>
		</tr>
		<tr>
			<td>N-tosyl-L-phenylalaninyl-chloromethylketone (TPCK)</td>
			<td>Sigma-Aldrich</td>
			<td>T4376</td>
			<td>protease inhibitor 
			http://www.sigmaaldrich.com/catalog/product/sigma/t4376?lang=en&#38;region=TW</td>
		</tr>
		<tr>
			<td>Bio-Rad protein assay dye reagent concentrate</td>
			<td>Bio&#8208;Rad</td>
			<td>500-0006</td>
			<td>for protein quantitation 
			http://www.bio-rad.com/en-us/sku/5000006-bio-rad-protein-assay-dye-reagent-concentrate</td>
		</tr>
		<tr>
			<td>Protein standard (bovine serum albumin)</td>
			<td>Sigma-Aldrich</td>
			<td>P5619&#160;</td>
			<td>a standard protein for Bio-Rad Protein Assay 
			http://www.sigmaaldrich.com/catalog/product/fluka/p5619?lang=en&#38;region=TW</td>
		</tr>
		<tr>
			<td>DEAE&#8211;Sephadex &#160;A-25 chloride form</td>
			<td>Sigma-Aldrich</td>
			<td>A25120</td>
			<td>http://www.sigmaaldrich.com/catalog/product/sigma/a25120?lang=en&#38;region=TW</td>
		</tr>
		<tr>
			<td>Spectrum/Por dialysis tubing</td>
			<td>Spectrum Laboratories</td>
			<td>132720</td>
			<td>with molecular weight cutoff of 14 kDa 
			http://www.spectrumlabs.com/dialysis/RCtubing.html?Pn=132720;</td>
		</tr>
		<tr>
			<td>Acrodisc&#174; units with Mustang&#174; E membrane</td>
			<td>Pall</td>
			<td>MSTG25E3</td>
			<td>for endotoxin removal; operated at flow rates ranging from 1 to 4 ml/min 
			http://www.pall.com/main/laboratory/product.page?id=19992</td>
		</tr>
		<tr>
			<td>mouse monoclonal antibody MAb 16F4</td>
			<td>N/A</td>
			<td>N/A</td>
			<td>raised against the purified HP-NAP of H. pylori strain NCTC 11637 as described in Refernce 23;&#160; A gift from Drs. Evanthia Galanis and Ianko D. Iankov at Mayo Clinic, USA 
			http://www.sciencedirect.com/science/article/pii/S0264410X10017585</td>
		</tr>
		<tr>
			<td>HiLoad 16/600 Superdex 200 pg</td>
			<td>GE Healthcare Life Sciences</td>
			<td>28989335</td>
			<td>for gel filtration chromatography 
			http://www.gelifesciences.com/webapp/wcs/stores/servlet/productById/en/GELifeSciences-tw/28989335</td>
		</tr>
		<tr>
			<td>PlusOne silver staining kit, protein</td>
			<td>GE Healthcare Life Sciences</td>
			<td>17-1150-01</td>
			<td>http://www.gelifesciences.com/webapp/wcs/stores/servlet/productById/en/GELifeSciences-tw/17115001</td>
		</tr>
		<tr>
			<td>Ficoll-Paque PLUS</td>
			<td>GE Healthcare Life Sciences</td>
			<td>17-1440-02</td>
			<td>for density gradient centrifugation to purify human neutrophils 
			http://www.gelifesciences.com/webapp/wcs/stores/servlet/catalog/en/GELifeSciences-tw/products/AlternativeProductStructure _16963/17144002</td>
		</tr>
		<tr>
			<td>Flat bottom 96-well white plate</td>
			<td>Thermo Fisher Scientific Inc</td>
			<td>236108</td>
			<td>http://www.thermoscientific.com/en/product/nunc-f96-microwell-black-white-polystyrene-plate.html</td>
		</tr>
		<tr>
			<td>Luminol</td>
			<td>Sigma-Aldrich</td>
			<td>A8511</td>
			<td>protected from light 
			http://www.sigmaaldrich.com/catalog/product/sigma/a8511?lang=en&#38;region=TW</td>
		</tr>
		<tr>
			<td>Expand &#160;long template PCR system</td>
			<td>Sigma-Aldrich</td>
			<td>11681834001</td>
			<td>source of High Fidelity PCR enzyme mix 
			http://www.sigmaaldrich.com/catalog/product/roche/elongro?lang=en&#38;region=TW</td>
		</tr>
		<tr>
			<td>Dpn I</td>
			<td>New England Biolabs</td>
			<td>R0176S</td>
			<td>https://www.neb.com/products/r0176-dpni</td>
		</tr>
		<tr>
			<td>Xho I</td>
			<td>New England Biolabs</td>
			<td>R0146S</td>
			<td>https://www.neb.com/products/r0146-xhoi</td>
		</tr>
		<tr>
			<td>E. coli DH5&#945;</td>
			<td>Thermo Fisher Scientific Inc</td>
			<td>18265-017</td>
			<td>https://www.thermofisher.com/order/catalog/product/18265017</td>
		</tr>
		<tr>
			<td>Name</td>
			<td>Company</td>
			<td>Product Number</td>
			<td>Comments</td>
		</tr>
		<tr>
			<td>Equipment</td>
			<td></td>
			<td></td>
			<td> 
			&#160;</td>
		</tr>
		<tr>
			<td>U-2800 double beam UV/VIS spectrophotometer</td>
			<td>Hitachi&#160;</td>
			<td>N/A</td>
			<td>out of market and upgraded to a new model 
			http://hitachi-hta.com/products/life-sciences-chemical-analysis/uvvisible-spectrophotometers</td>
		</tr>
		<tr>
			<td>EmulsiFlex-C3 high pressure homogenizer</td>
			<td>Avestin Inc</td>
			<td>C315320</td>
			<td>http://www.avestin.com/English/c3page.html</td>
		</tr>
		<tr>
			<td>Hitachi Koki himac CP80WX general ultracentrifuge</td>
			<td>Hitachi Koki Co</td>
			<td>90106401</td>
			<td>for separation of the soluble and insoluble protein fractions from E. coli lysates 
			http://centrifuges.hitachi-koki.com/products/ultra/cp_wx/cp_wx.html</td>
		</tr>
		<tr>
			<td>&#196;KTA FPLC</td>
			<td>GE Healthcare Life Sciences</td>
			<td>18-1900-26</td>
			<td>for gel filtration chromatography 
			http://www.gelifesciences.com/webapp/wcs/stores/servlet/productById/en/GELifeSciences-tw/18190026</td>
		</tr>
		<tr>
			<td>Aviv model 62ADS CD spectrophotometer</td>
			<td>Aviv Biomedical</td>
			<td>N/A</td>
			<td>out of market and upgraded to a new model 
			http://www.avivbiomedical.com/circular.php</td>
		</tr>
		<tr>
			<td>LAS-3000 imaging system</td>
			<td>Fujifilm</td>
			<td>N/A</td>
			<td>discontinued and replaced 
			http://www.gelifesciences.com/webapp/wcs/stores/servlet/productById/en/GELifeSciences-tw/28955810</td>
		</tr>
		<tr>
			<td>Wallac 1420 (Victor2) multilabel counter</td>
			<td>Perkin-Elmer</td>
			<td>1420-018</td>
			<td>for chemiluminescence detection 
			http://www.perkinelmer.com/catalog/product/id/1420-018</td>
		</tr>
	</tbody>
</table>

one-step negative chromatographic purification of helicobacter pylori neutrophil-activating protein overexpressed in escherichia coli in batch mode

Helicobacter pylori neutrophiles-activating protein (HP-NAP) est un facteur de virulence majeur de Helicobacter pylori (H. pylori). Elle joue un rôle crucial dans H. pylori gastrique induite par l&#39; inflammation en activant les leucocytes plusieurs innés incluant les neutrophiles, les monocytes et les mastocytes. Les propriétés immunogènes et immunomodulatrices de HP-NAP en font un candidat vaccin potentiel diagnostique et H. pylori et un nouveau candidat médicament pour le traitement du cancer. Afin d&#39;obtenir des quantités importantes de HP-NAP purifié utilisé pour ses applications cliniques, une méthode efficace pour purifier cette protéine avec un rendement élevé et la pureté doit être établie. Dans ce protocole, nous avons décrit un procédé en une étape négative purification chromatographique de HP-NAP recombinante surexprimée dans Escherichia coli (E. coli) en utilisant diéthylaminoéthyle (DEAE) des résines échangeuses d&#39; ions (par ex., Sephadex®) , ile mode de traitement par lots n. HP-NAP recombinante constitue près de 70% de la protéine totale dans E. coli et est presque entièrement récupérée dans la fraction soluble après lyse cellulaire à un pH de 9,0. Sous la condition optimale à un pH de 8,0, la majorité des HP-NAP est récupéré dans la fraction non liée , tandis que les protéines endogènes de E. coli sont efficacement éliminés par la résine. Cette méthode de purification par chromatographie négative par lots de mode avec DEAE résines échangeuses d&#39; ions donne de HP-NAP fonctionnel à partir de E. coli sous sa forme native avec un rendement élevé et de pureté. Le HP-NAP purifiée pourrait encore être utilisé pour la prévention, le traitement et le pronostic de H. pylori -Associated maladies, ainsi que la thérapie du cancer.

Le schéma de principe du mode opératoire de purification négative de HP-NAP recombinante exprimée dans E. coli en utilisant DEAE résines échangeuses d&#39; ions en mode discontinu est représenté sur la figure 1. Cette technique de purification est basée sur la liaison des protéines et / ou des impuretés autres que HP-NAP à la résine cellule hôte. A pH 8,0, presque pas d&#39; autres protéines à l&#39; exception de HP-NAP sous sa forme native sont ...

Watch this Scientific Journal Video about One-step Negative Chromatographic Purification of Helicobacter pylori Neutrophil-activating Protein Overexpressed in Escherichia coli in Batch Mode at JoVE.co

One-step Negative Chromatographic Purification of Helicobacter pylori Neutrophil-activating Protein Overexpressed in Escherichia coli in Batch Mode

Procédé à rendement élevé pour une étape de purification du recombinant négatif Helicobacter pylori protéine d&#39; activation des neutrophiles (HP-NAP) surexprimé dans Escherichia coli en utilisant des résines de diéthylaminoéthyle en mode discontinu est décrit. HP-NAP purifié par cette méthode est bénéfique pour le développement de vaccins, de médicaments ou de diagnostic pour H. pylori -Associated maladies.

Une étape négative de purification chromatographique<em&gt; Helicobacter pylori</em&gt; Activation des neutrophiles protéine surexprimée dans<em&gt; Escherichia coli</em&gt; En mode batch

Helicobacter pylori neutrophil-activating protein (HP-NAP) is a major virulence factor of Helicobacter pylori (H. pylori). It plays a critical role in H. ...

The overall goal of this purification is to yield functional Helicobacter pylori Neutrophil-activating protein or HP-NAP in its native form with high purity and high yield using negative mode batch chromatography with di-ethyl amino-ethyl ion exchange resin. The main advantage of this technique is that HP-NAP can be purified in its native form in one step with high purity and high yield. Negative purification of HP-NAP starts with a batch binding procedure in which the soluble protein fraction from bacterial lysates is added to DEAE resin.The mixture is incubated to allow wholesale proteins to bind to the resin. HP-NAP present in the unbound fraction is then obtained by centrifugation of gravity flow. The implications of this technique is 10:1 prevention treatment and prognostic of Helicobacter pylori associated diseases as well as cancer therapy.Because of the immunogenic and immunomodulatory properties of HP-NAP. Generally, individuals new to this method will struggle. Because HP-NAP easily aggregates during the sterilization.Demonstrating the procedure will be Zhi-Wei Hong, a graduate student from our lab. Working at four degrees Celsius, we suspend 50 milliliters of the cell palate prepared as described in the text protocol in 20 milliliters of low salt, tris-buffer at pH 9.0 with protease inhibitor mixture. It's critical to keep sample at the four degrees Celsius to allow the procedure to prevent the protein aggregation.Disrupt the bacterial cells by passing the bacterial suspension through a high-pressure homogenizer operated at a range of 15, 000 to 20, 000 PSI for seven times at four degrees Celsius. After lysates baterializes, it should be centrifuged immediately. Transfer homogenized samples to a centrifuge tube.Immediately centrifuge the cell-lysate at 30, 000 times G at four degrees Celsius for one hour to separate the soluble and insoluble protein fractions by using an ultra-centrifuge. Following centrifugation, transfer the supernatant as the soluble protein fraction to a beaker. Measure the protein concentration of the soluble protein fraction by the Bradford method using a commercial kit with bovine serum albumin as the standard according to the manufacturer's instructions.Then add 177.6 microliters of one normal HCl into 20 milliliters of the soluble protein fraction to adjust its pH value from pH 9.0 to pH 8.0. Add 20 millimeter Tris-HCl, pH 8.0, 50 milliliter sodium chloride to the protein solution to result in a final protein concentration of 0.5 milligrams per milliliter. To prepare 15 milliliters of DEAE resin, suspend 0.6 grams of DEAE resin dry powder in 30 milliliters of Tris-HCl buffer at room temperature for at least one day.Centrifuge the resin at 10, 000 times G at four degrees Celsius for one minute and then remove and discard the supernatant. Then add 15 milliliters of Tris-HCl buffer. After repeating the centrifugation resuspension steps four more times, store the 15 milliliters of settled resin at four degrees Celsius for subsequent use.Working at four degrees Celsius, add 45 milliliters of the prepared soluble proteins to milliliters of the resin and transfer to a 100 milliliter beaker with stir bar. Stir the protein resin slurry using a stir plate at four degrees Celsius for one hour. Next, pour the protein resin slurry into a plastic or a glass column fitted with a stopcock and allow the resin to settle under gravity.Open the stopcock to allow the protein solution to run through the column by gravity flow until the liquid level in the column is just above the resin. Collect the flow through as the unbound fraction which contains the purified neutrophil-activating protein. Add 15 milliliters of the ice-cold Tris-HCl buffer into the column.Open the stopcock again to allow the wash buffer to run through the column by gravity flow until the liquid level in the column is just above the resin. Collect the flow through as the wash fraction. Repeat washing with ice-cold buffer four more times to collect the additional wash fractions.Then add 15 milliliters of ice-cold 20 millimeter Tris-HCl pH 8.0, one molar sodium chloride into the column. Collect the flow through as the elution fractions as before. Repeat the elution steps four more times to collect the additional elution fractions.The effect of pH on solubility of HP-NAP in E.coli lysate are shown here. The amount of HP-NAP detected in this soluble fraction was markedly increased at pH 7.5 to 9.5. Recombinant HP-NAP was almost fully recovered in the soluble fraction upon cell lysis at pH 9.0.Here, the effect of pH on negative purification of recombinant HP-NAP expressed in E.coli by DEAE resins in batch mode are shown. At pH 8.0, only a little amount of HP-NAP was present in the elution fraction. The amount of HP-NAP present in the unbound fractions was the highest at pH 8.0.The optimized amount of proteins loaded onto the DEAE resin is 1.5 milligrams of protein per milliliter of resin for achieving maximum capacity of the resin to absorb the impurities from E.coli. At pH 8.0, very few proteins other than HP-NAP in its native form are recovered in the unbound fraction using DEAE resins in batch mode. The purity of HP-NAP was higher than 95 percent.The purified HP-NAP folds into a multimer with a secondary structure of alpha-helix as revealed by the gelifiltration chromotogram and the far UV circular dichroism spectrum. A luminal dependent chemiluminescence assay reveals that the purified HP-NAP is able to trigger the production of reactive oxygen species by neutrophiles. Once mastered, these techniques can be done within five hours if it is performed properly.After watching this video you should have a good understanding of how to purify functional HP-NAP in its native form with high yield and purity using negative mode batch chromotography with DEAE and exchange resin. While attempting this procedure, it's important to remember to use buffers at the appropriate pH in the step of sterilizes in the batch chromotography. We first had the idea for this method when we tried to apply other chromotographic approaches instead of filtration to purify HP-NAP in its native form.Though this method is designed to appeal by recombinant HP-NAP expressed in E.coli. It can also be applied to other bacterial expression systems such as per-sida sep-tidas. Visual demonstration of this measure is quick code.Plus the step of sterilizes and batch chromotography are difficult to learn. Because these steps must be carried out at the four degrees Celsius without any time delay. If a protein designed for purification is suitable for our exchange chromotography in negative mode, this procedure could also be adapted as a starting point for the development of purification process.After its development, this technique paved the way for researchers in the field of clinical research to explore the possibility of using HP-NAP in cancer therapy as well as the development of vaccines, drugs, and the diagnostics for Helicobacter pylori associated disease.

Research

JoVE Journal

Immunology and Infection

One-step Negative Chromatographic Purification of Helicobacter pylori Neutrophil-activating Protein Overexpressed in Escherichia coli in Batch Mode

Non-Invasive Model of Neuropathogenic Escherichia coli Infection in the Neonatal Rat

Non-Invasive Model of Neuropathogenic Escherichia coli Infection in the Neonatal Rat

Modèle non-invasive de neuropathogènes<em&gt; Escherichia coli</em&gt; Maladies infectieuses chez le rat nouveau-né

Investigation of the interactions between animal host and bacterial pathogen is only meaningful if the infection model employed replicates the principal ...

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Immunologie et infection

High Resolution Electron Microscopy of the Helicobacter pylori Cag Type IV Secretion System Pili Produced in Varying Conditions of Iron Availability

High Resolution Electron Microscopy of the Helicobacter pylori Cag Type IV Secretion System Pili Produced in Varying Conditions of Iron Availability

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Helicobacter pylori is a helical-shaped, gram negative bacterium that colonizes the human gastric niche of half of the human population1,2.  H. pylori is ...

Organoids as Model for Infectious Diseases: Culture of Human and Murine Stomach Organoids and Microinjection of Helicobacter Pylori

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

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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

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La surexpression et la purification de l&#39;être humain<em&gt; Cis</em&gt; -prenyltransférase dans<em&gt; Escherichia coli</em

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

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Un protocole Facile à générer des protéines relativement acétylées chez 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. ...

Dissecting Multi-protein Signaling Complexes by Bimolecular Complementation Affinity Purification (BiCAP)

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Dissection multi-signalisation Complexes protéiques par Purification d’affinité de complémentation bimoléculaire (BiCAP)

The assembly of protein complexes is a central mechanism underlying the regulation of many cell signaling pathways. A major focus of biomedical research ...

Using Enhanced Green Fluorescence Protein-expressing Escherichia Coli to Assess Mouse Peritoneal Macrophage Phagocytosis

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This manuscript describes a simple and reproducible method to perform a phagocytosis assay. The first part of this method involves building a ...

Purification of a High Molecular Mass Protein in Streptococcus mutans

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Elucidation of a gene&#39;s function typically involves comparison of phenotypic traits of wild-type strains and strains in which the gene of interest has ...