Name: a "plug-and-display" nanoparticle vaccine platform based on outer membrane vesicles displaying sars-cov-2 receptor-binding domain
Uploaded: 2022-07-25T14:30:00
Description: Watch this Scientific Journal Video about A "Plug-And-Display" Nanoparticle Vaccine Platform Based on Outer Membrane Vesicles Displaying SARS-CoV-2 Receptor-Binding Domain at JoVE.com

This work was supported by the Key Program of Chongqing Natural Science Foundation (No. cstc2020jcyj-zdxmX0027) and the Chinese National Natural Science Foundation Project (No. 31670936, 82041045).

1. Plasmid construction
<ol>
	<li>Insert DNA encoding SpyCatcher sequence (Supplementary File 1) into an ampicillin-resistant pThioHisA-ClyA plasmid (see Table of Materials) between the BamH I and Sal I sites to construct the plasmid pThioHisA ClyA-SC following a previously published report20.</li>
	<li>Ligate the synthesized SpyTag-RBD-Histag fusion gene (Supplementary File 1) into a pcDNA3.1 plasmid (see Table...

<ol>
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A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Outer+membrane+vesicle+vaccines.">Outer membrane vesicle vaccines.</a> Seminars in Immunology. 50, 101433 (2020).</li><li>Toyofuku, M., Nomura, N., Eberl, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Types+and+origins+of+bacterial+membrane+vesicles.">Types and origins of bacterial membrane vesicles.</a> Nature Reviews Microbiology. 17 (1), 13-24 (2019).</li><li>Sartorio, M. G., Pardue, E. J., Feldman, M. F., Haurat, M. 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Q., Peng, Q. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bacterial+outer+membrane+vesicles+as+potential+biological+nanomaterials+for+antibacterial+therapy.">Bacterial outer membrane vesicles as potential biological nanomaterials for antibacterial therapy.</a> Acta Biomaterialia. 140, 102-115 (2022).</li><li>Hoffmann, M., 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=SARS-CoV-2+cell+entry+depends+on+ACE2+and+TMPRSS2+and+is+blocked+by+a+clinically+proven+protease+inhibitor.">SARS-CoV-2 cell entry depends on ACE2 and TMPRSS2 and is blocked by a clinically proven protease inhibitor.</a> Cell. 181 (2), 271-280 (2020).</li><li>Robbiani, D. F., 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=Convergent+antibody+responses+to+SARS-CoV-2+in+convalescent+individuals.">Convergent antibody responses to SARS-CoV-2 in convalescent individuals.</a> Nature. 584 (7821), 437-442 (2020).</li><li>Wang, M. Y., 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=SARS-CoV-2:+Structure,+Biology,+and+Structure-Based+Therapeutics+Development.">SARS-CoV-2: Structure, Biology, and Structure-Based Therapeutics Development.</a> Frontiers in Cellular and Infection Microbiology. 10, 587269 (2020).</li><li>Yang, 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=Safety+and+immunogenicity+of+a+recombinant+tandem-repeat+dimeric+RBD-based+protein+subunit+vaccine+(ZF2001)+against+COVID-19+in+adults:+Two+randomised,+double-blind,+placebo-controlled,+phase+1+and+2+trials.">Safety and immunogenicity of a recombinant tandem-repeat dimeric RBD-based protein subunit vaccine (ZF2001) against COVID-19 in adults: Two randomised, double-blind, placebo-controlled, phase 1 and 2 trials.</a> The Lancet Infectious Disease. 21 (8), 1107-1119 (2021).</li><li>Wang, Z., 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=mRNA+vaccine-elicited+antibodies+to+SARS-CoV-2+and+circulating+variants.">mRNA vaccine-elicited antibodies to SARS-CoV-2 and circulating variants.</a> Nature. 592 (7855), 616-622 (2021).</li><li>Amanat, F., 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=SARS-CoV-2+mRNA+vaccination+induces+functionally+diverse+antibodies+to+NTD,+RBD,+and+S2.">SARS-CoV-2 mRNA vaccination induces functionally diverse antibodies to NTD, RBD, and S2.</a> Cell. 184 (15), 3936-3948 (2021).</li><li>Tan, H. X., 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=Immunogenicity+of+prime-boost+protein+subunit+vaccine+strategies+against+SARS-CoV-2+in+mice+and+macaques.">Immunogenicity of prime-boost protein subunit vaccine strategies against SARS-CoV-2 in mice and macaques.</a> Nature Communication. 12 (1), 1403 (2021).</li><li>Thapa, H. B., Mueller, A. M., Camilli, A., Schild, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+intranasal+vaccine+based+on+outer+membrane+vesicles+against+SARS-CoV-2.">An intranasal vaccine based on outer membrane vesicles against SARS-CoV-2.</a> Frontiers in Microbiology. 12, 752739 (2021).</li><li>Ma, X., 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=Nanoparticle+vaccines+based+on+the+receptor+binding+domain+(RBD)+and+heptad+repeat+(HR)+of+SARS-CoV-2+elicit+robust+protective+immune+responses.">Nanoparticle vaccines based on the receptor binding domain (RBD) and heptad repeat (HR) of SARS-CoV-2 elicit robust protective immune responses.</a> Immunity. 53 (6), 1315-1330 (2020).</li><li>Yang, Z., 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=RBD-modified+bacterial+vesicles+elicited+potential+protective+immunity+against+SARS-CoV-2.">RBD-modified bacterial vesicles elicited potential protective immunity against SARS-CoV-2.</a> Nano Letters. 21 (14), 5920-5930 (2021).</li><li>Rhinesmith, T., Killinger, B. A., Sharma, A., Moszczynska, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Multimer-PAGE:+A+method+for+capturing+and+resolving+protein+complexes+in+biological+samples.">Multimer-PAGE: A method for capturing and resolving protein complexes in biological samples.</a> Journal of Visualized Experiments. (123), e55341 (2017).</li><li>Arslan, A., 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=Determining+total+protein+and+bioactive+protein+concentrations+in+bovine+colostrum.">Determining total protein and bioactive protein concentrations in bovine colostrum.</a> Journal of Visualized Experiments. (178), e63001 (2021).</li><li>Alves, N. J., Turner, K. B., Walper, S. 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O., 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=Neutralizing+antibody+vaccine+for+pandemic+and+pre-emergent+coronaviruses.">Neutralizing antibody vaccine for pandemic and pre-emergent coronaviruses.</a> Nature. 594, 553-559 (2021).</li><li>van Saparoea, H. B. V., Houben, D., Kuijl, C., Luirink, J., Jong, W. S. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Combining+protein+ligation+systems+to+expand+the+functionality+of+semi-synthetic+outer+membrane+vesicle+nanoparticles.">Combining protein ligation systems to expand the functionality of semi-synthetic outer membrane vesicle nanoparticles.</a> Frontiers in Microbiology. 11, 890 (2020).</li><li>Needham, B. 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=Modulating+the+innate+immune+response+by+combinatorial+engineering+of+endotoxin.">Modulating the innate immune response by combinatorial engineering of endotoxin.</a> Proceedings of the National Academy of Sciences of the United States of America. 110 (4), 1464-1469 (2013).</li><li>Zanella, I., 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=Proteome-minimized+outer+membrane+vesicles+from+Escherichia+coli+as+a+generalized+vaccine+platform.">Proteome-minimized outer membrane vesicles from Escherichia coli as a generalized vaccine platform.</a> Journal of Extracellular Vesicles. 10 (4), 12066 (2021).</li><li>Wang, J. 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To create a &#34;Plug-and-Display&#34; nanoparticle vaccine platform, SC-fused ClyA was expressed in BL21(DE3) strains, which is one of the most widely used models for recombinant protein production because of its advantages in protein expression24, so that there would be enough SC fragment displaying on the surface of the OMVs during the process of bacteria proliferation. At the same time, an ST-fused target antigen was prepared for the chemical coupling between the antigens and OMVs. This experi...

As a potential vaccine platform, outer membrane vesicles (OMVs) have attracted more and more attention in recent years1,2. OMVs, mainly secreted naturally by gram-negative bacteria3, are spherical nanoscale particles composed of a lipid bilayer, usually in the size of 20-300 nm4. OMVs contain various parental bacterial components, including bacterial antigens and pathogen-associated molecular patterns (PAMPs), which serve as solid immune potentiators5. Benefiting from their unique components, natural vesicle structure, and great genetic engineering modification sites, OMVs have been developed for use in many biomedical fields, including bacterial vaccines6, adjuvants7, cancer immunotherapy drugs8, drug delivery vectors9, and anti-bacterial adhesives10.
The SARS-CoV-2 pandemic, which has spread worldwide since 2020, has taken a heavy toll on global society. The receptor-binding domain (RBD) in spike protein (S protein) can bind with human angiotensin-converting enzyme 2 (ACE2), which then mediates the entry of the virus into the cell11,12,13. Thus, RBD seems to be a prime target for vaccine discovery14,15,16. However, monomeric RBD is poorly immunogenic, and its small molecular weight makes it difficult for the immune system to recognize, so adjuvants are often required17.
In order to increase the immunogenicity of RBD, OMVs displaying polyvalent RBDs were constructed. Existing studies using OMV to display RBD usually fuse RBD with OMV to be expressed in bacteria18. However, RBD is a virus-derived protein, and prokaryotic expression is likely to affect its activity. To solve this problem, the SpyTag (ST)/SpyCatcher (SC) system, derived from Streptococcus pyogenes, was used to form a covalent isopeptide with OMV and RBD in a conventional buffer system19. The SC domain was expressed with Cytolysin A (ClyA) as a fusion protein by bioengineered Escherichia coli, and ST was expressed with RBD via the HEK293F cellular expression system. OMV-SC and RBD-ST were mixed and incubated overnight. After purification by ultracentrifugation or size-exclusion chromatography (SEC), OMV-RBD was obtained.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>Ampicillin sodium</td>
			<td>Sangon Biotech</td>
			<td>A610028</td>
			<td></td>
		</tr>
		<tr>
			<td>Automated cell counter</td>
			<td>Countstar</td>
			<td>BioTech</td>
			<td></td>
		</tr>
		<tr>
			<td>BCA protein quantification Kit</td>
			<td>cwbio</td>
			<td>cw0014s</td>
			<td></td>
		</tr>
		<tr>
			<td>ChemiDoc Touching Imaging System</td>
			<td>Bio-rad</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Danamic Light Scattering</td>
			<td>Malvern</td>
			<td>Zetasizer Nano S90</td>
			<td></td>
		</tr>
		<tr>
			<td>Electrophoresis apparatus</td>
			<td>Cavoy</td>
			<td>Power BV</td>
			<td></td>
		</tr>
		<tr>
			<td>EZ-Buffers H 10X TBST Buffer</td>
			<td>Sangon Biotech</td>
			<td>C520009</td>
			<td></td>
		</tr>
		<tr>
			<td>Goat pAb to mouse IgG1</td>
			<td>Abcam</td>
			<td>ab97240</td>
			<td></td>
		</tr>
		<tr>
			<td>High speed freezing centrifuge</td>
			<td>Bioridge</td>
			<td>H2500R</td>
			<td></td>
		</tr>
		<tr>
			<td>His-Tag mouse mAb</td>
			<td>Cell signaling technology</td>
			<td>2366s</td>
			<td></td>
		</tr>
		<tr>
			<td>Imidazole</td>
			<td>Sangon Biotech</td>
			<td>A600277</td>
			<td></td>
		</tr>
		<tr>
			<td>Isopropyl beta-D-thiogalactopyranoside</td>
			<td>Sangon Biotech</td>
			<td>A600118</td>
			<td></td>
		</tr>
		<tr>
			<td>Ni-NTA His-Bind Superflow</td>
			<td>Qiagen</td>
			<td>70691</td>
			<td></td>
		</tr>
		<tr>
			<td>Non-fat powdered milk</td>
			<td>Sangon Biotech</td>
			<td>A600669</td>
			<td></td>
		</tr>
		<tr>
			<td>OPM-293 cell culture medium</td>
			<td>Opm biosciences</td>
			<td>81075-001</td>
			<td></td>
		</tr>
		<tr>
			<td>pcDNA3.1 RBD-ST plasmid</td>
			<td>Wuhan genecreat biological techenology</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Phosphate buffer saline</td>
			<td>ZSGB-bio</td>
			<td>ZLI-9061</td>
			<td></td>
		</tr>
		<tr>
			<td>Polyethylenimine Linear</td>
			<td>Polysciences</td>
			<td>23966-1</td>
			<td></td>
		</tr>
		<tr>
			<td>Prestained protein ladder</td>
			<td>Thermo</td>
			<td>26616</td>
			<td></td>
		</tr>
		<tr>
			<td>pThioHisA ClyA-SC plasmid</td>
			<td>Wuhan genecreat biological techenology</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>PVDF Western Blotting Membranes</td>
			<td>Roche</td>
			<td>03010040001</td>
			<td></td>
		</tr>
		<tr>
			<td>Quixstand benchtop systems (100 kD hollow fiber column)</td>
			<td>GE healthcare</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>SDS-PAGE loading buffer (5x)</td>
			<td>Beyotime</td>
			<td>P0015</td>
			<td></td>
		</tr>
		<tr>
			<td>Sodium chloride</td>
			<td>Sangon Biotech</td>
			<td>A100241</td>
			<td></td>
		</tr>
		<tr>
			<td>Supersignal west pico PLUS (enhanced chemiluminescence solution)</td>
			<td>Thermo</td>
			<td>34577</td>
			<td></td>
		</tr>
		<tr>
			<td>Suspension instrument</td>
			<td>Life Technology</td>
			<td>Hula Mixer</td>
			<td></td>
		</tr>
		<tr>
			<td>Transmission Electron Microscope</td>
			<td>Hitachi</td>
			<td>HT7800</td>
			<td></td>
		</tr>
		<tr>
			<td>Tryptone</td>
			<td>Oxoid</td>
			<td>LP0042B</td>
			<td></td>
		</tr>
		<tr>
			<td>Ultracentrifuge</td>
			<td>Beckman coulter</td>
			<td>XPN-100</td>
			<td></td>
		</tr>
		<tr>
			<td>Ultraviolet spectrophotometer</td>
			<td>Hitachi</td>
			<td>U-3900</td>
			<td></td>
		</tr>
		<tr>
			<td>Yeast extract</td>
			<td>Sangon Biotech</td>
			<td>A610961</td>
			<td></td>
		</tr>
	</tbody>
</table>

a "plug-and-display" nanoparticle vaccine platform based on outer membrane vesicles displaying sars-cov-2 receptor-binding domain

Biomimetic nanoparticles obtained from bacteria or viruses have attracted substantial interest in vaccine research and development. Outer membrane vesicles (OMVs) are mainly secreted by gram-negative bacteria during average growth, with a nano-sized diameter and self-adjuvant activity, which may be ideal for vaccine delivery. OMVs have functioned as a multifaceted delivery system for proteins, nucleic acids, and small molecules. To take full advantage of the biological characteristics of OMVs, bioengineered Escherichia coli-derived&#160;OMVs were utilized as a carrier and SARS-CoV-2 receptor-binding domain (RBD) as an antigen to construct a &#34;Plug-and-Display&#34; vaccine platform. The SpyCatcher (SC) and SpyTag (ST) domains in Streptococcus pyogenes were applied to conjugate OMVs and RBD. The Cytolysin A (ClyA) gene was translated with the SC gene as a fusion protein after plasmid transfection, leaving a reactive site on the surface of the OMVs. After mixing RBD-ST in a conventional buffer system overnight, covalent binding was formed between the OMVs and RBD. Thus, a multivalent-displaying OMV vaccine was achieved. By replacing with diverse antigens, the OMVs vaccine platform can efficiently display a variety of heterogeneous antigens, thereby potentially rapidly preventing infectious disease epidemics. This protocol describes a precise method for constructing the OMV vaccine platform, including production, purification, bioconjugation, and characterization.

The flowchart for this protocol is shown in Figure 1. This protocol could be a general approach to utilizing OMVs as a vaccine platform; one only needs to choose the appropriate expression systems based on the type of antigens.
Figure 2&#160;provides a feasible plasmid design scheme. The SC gene is connected with the ClyA gene via a flexible linker, while ST connects to the 5&#39; terminal of the RBD gene with a His-tag gene for purif...

Watch this Scientific Journal Video about A "Plug-And-Display" Nanoparticle Vaccine Platform Based on Outer Membrane Vesicles Displaying SARS-CoV-2 Receptor-Binding Domain at JoVE.com

A "Plug-And-Display" Nanoparticle Vaccine Platform Based on Outer Membrane Vesicles Displaying SARS-CoV-2 Receptor-Binding Domain

The present protocol describes the bioengineering of outer membrane vesicles to be a "Plug-and-Display" vaccine platform, including production, purification, bioconjugation, and characterization.

Biomimetic nanoparticles obtained from bacteria or viruses have attracted substantial interest in vaccine research and development. Outer membrane ...

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