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The expression and antigenicity of a truncated spike-nucleocapsid fusion protein of severe acute respiratory syndrome-associated coronavirus

Identifieur interne : 002F91 ( Main/Exploration ); précédent : 002F90; suivant : 002F92

The expression and antigenicity of a truncated spike-nucleocapsid fusion protein of severe acute respiratory syndrome-associated coronavirus

Auteurs : Feng Mu [République populaire de Chine] ; Dongsheng Niu [République populaire de Chine] ; Jingsong Mu [République populaire de Chine] ; Bo He [République populaire de Chine] ; Weiguo Han [République populaire de Chine] ; Baoxing Fan [République populaire de Chine] ; Shengyong Huang [République populaire de Chine] ; Yan Qiu [République populaire de Chine] ; Bo You [République populaire de Chine] ; Weijun Chen [République populaire de Chine]

Source :

RBID : PMC:2613400

Descripteurs français

English descriptors

Abstract

Background

In the absence of effective drugs, controlling SARS relies on the rapid identification of cases and appropriate management of the close contacts, or effective vaccines for SARS. Therefore, developing specific and sensitive laboratory tests for SARS as well as effective vaccines are necessary for national authorities.

Results

Genes encoding truncated nucleocapsid (N) and spike (S) proteins of SARSCoV were cloned into the expression vector pQE30 and fusionally expressed in Escherichia coli M15. The fusion protein was analyzed for reactivity with SARS patients' sera and with anti-sera against the two human coronaviruses HCoV 229E and HCoV OC43 by ELISA, IFA and immunoblot assays. Furthermore, to evaluate the antigen-specific humoral antibody and T-cell responses in mice, the fusion protein was injected into 6-week-old BALB/c mice and a neutralization test as well as a T-cell analysis was performed. To evaluate the antiviral efficacy of immunization, BALB/c mice were challenged intranasally with SARSCoV at day 33 post injection and viral loads were determined by fluorescent quantitative RT-PCR. Serological results showed that the diagnostic sensitivity and specificity of the truncated S-N fusion protein derived the SARS virus were > 99% (457/460) and 100.00% (650/650), respectively. Furthermore there was no cross-reactivity with other two human coronaviruses. High titers of antibodies to SRASCoV appeared in the immunized mice and the neutralization test showed that antibodies to the fusion protein could inhibit SARSCoV. The T cell proliferation showed that the fusion protein could induce an antigen-specific T-cell response. Fluorescent quantitative RT-PCR showed that BALB/c mice challenged intranasally with SARSCoV at day 33 post injection were completely protected from virus replication.

Conclusion

The truncated S-N fusion protein is a suitable immunodiagnostic antigen and vaccine candidate.

Electronic supplementary material

The online version of this article (doi:10.1186/1471-2180-8-207) contains supplementary material, which is available to authorized users.


Url:
DOI: 10.1186/1471-2180-8-207
PubMed: 19038059
PubMed Central: 2613400


Affiliations:


Links toward previous steps (curation, corpus...)


Le document en format XML

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<term>Animals</term>
<term>Antibodies, Viral (immunology)</term>
<term>Antibody Formation</term>
<term>Antigens, Viral (immunology)</term>
<term>Cell Proliferation (drug effects)</term>
<term>Enzyme-Linked Immunosorbent Assay</term>
<term>Gene Expression Regulation, Viral</term>
<term>Humans</term>
<term>Immunity, Cellular</term>
<term>Membrane Glycoproteins (genetics)</term>
<term>Membrane Glycoproteins (immunology)</term>
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<term>Animaux</term>
<term>Anticorps antiviraux (immunologie)</term>
<term>Antigènes viraux (immunologie)</term>
<term>Glycoprotéine de spicule des coronavirus</term>
<term>Glycoprotéines membranaires (génétique)</term>
<term>Glycoprotéines membranaires (immunologie)</term>
<term>Humains</term>
<term>Immunité cellulaire</term>
<term>Production d'anticorps</term>
<term>Prolifération cellulaire ()</term>
<term>Protéines de fusion virale (génétique)</term>
<term>Protéines de fusion virale (immunologie)</term>
<term>Protéines de fusion virale (pharmacologie)</term>
<term>Protéines de l'enveloppe virale (génétique)</term>
<term>Protéines de l'enveloppe virale (immunologie)</term>
<term>Protéines nucléocapside (génétique)</term>
<term>Protéines nucléocapside (immunologie)</term>
<term>Rate (cytologie)</term>
<term>Régulation de l'expression des gènes viraux</term>
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<term>Sensibilité et spécificité</term>
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<term>Souris de lignée BALB C</term>
<term>Syndrome respiratoire aigu sévère ()</term>
<term>Test ELISA</term>
<term>Virus du SRAS (génétique)</term>
<term>Virus du SRAS (immunologie)</term>
<term>Virus du SRAS (physiologie)</term>
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<keywords scheme="MESH" type="chemical" qualifier="genetics" xml:lang="en">
<term>Membrane Glycoproteins</term>
<term>Nucleocapsid Proteins</term>
<term>Viral Envelope Proteins</term>
<term>Viral Fusion Proteins</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="immunology" xml:lang="en">
<term>Antibodies, Viral</term>
<term>Antigens, Viral</term>
<term>Membrane Glycoproteins</term>
<term>Nucleocapsid Proteins</term>
<term>Viral Envelope Proteins</term>
<term>Viral Fusion Proteins</term>
</keywords>
<keywords scheme="MESH" qualifier="cytologie" xml:lang="fr">
<term>Rate</term>
</keywords>
<keywords scheme="MESH" qualifier="cytology" xml:lang="en">
<term>Spleen</term>
</keywords>
<keywords scheme="MESH" qualifier="drug effects" xml:lang="en">
<term>Cell Proliferation</term>
</keywords>
<keywords scheme="MESH" qualifier="genetics" xml:lang="en">
<term>SARS Virus</term>
</keywords>
<keywords scheme="MESH" qualifier="génétique" xml:lang="fr">
<term>Glycoprotéines membranaires</term>
<term>Protéines de fusion virale</term>
<term>Protéines de l'enveloppe virale</term>
<term>Protéines nucléocapside</term>
<term>Virus du SRAS</term>
</keywords>
<keywords scheme="MESH" qualifier="immunologie" xml:lang="fr">
<term>Anticorps antiviraux</term>
<term>Antigènes viraux</term>
<term>Glycoprotéines membranaires</term>
<term>Protéines de fusion virale</term>
<term>Protéines de l'enveloppe virale</term>
<term>Protéines nucléocapside</term>
<term>Virus du SRAS</term>
</keywords>
<keywords scheme="MESH" qualifier="immunology" xml:lang="en">
<term>SARS Virus</term>
</keywords>
<keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr">
<term>Protéines de fusion virale</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en">
<term>Viral Fusion Proteins</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr">
<term>Virus du SRAS</term>
</keywords>
<keywords scheme="MESH" qualifier="physiology" xml:lang="en">
<term>SARS Virus</term>
</keywords>
<keywords scheme="MESH" qualifier="prevention & control" xml:lang="en">
<term>Severe Acute Respiratory Syndrome</term>
</keywords>
<keywords scheme="MESH" xml:lang="en">
<term>Animals</term>
<term>Antibody Formation</term>
<term>Enzyme-Linked Immunosorbent Assay</term>
<term>Gene Expression Regulation, Viral</term>
<term>Humans</term>
<term>Immunity, Cellular</term>
<term>Mice</term>
<term>Mice, Inbred BALB C</term>
<term>Sensitivity and Specificity</term>
<term>Spike Glycoprotein, Coronavirus</term>
<term>Virus Replication</term>
</keywords>
<keywords scheme="MESH" xml:lang="fr">
<term>Animaux</term>
<term>Glycoprotéine de spicule des coronavirus</term>
<term>Humains</term>
<term>Immunité cellulaire</term>
<term>Production d'anticorps</term>
<term>Prolifération cellulaire</term>
<term>Régulation de l'expression des gènes viraux</term>
<term>Réplication virale</term>
<term>Sensibilité et spécificité</term>
<term>Souris</term>
<term>Souris de lignée BALB C</term>
<term>Syndrome respiratoire aigu sévère</term>
<term>Test ELISA</term>
</keywords>
</textClass>
</profileDesc>
</teiHeader>
<front>
<div type="abstract" xml:lang="en">
<sec>
<title>Background</title>
<p>In the absence of effective drugs, controlling SARS relies on the rapid identification of cases and appropriate management of the close contacts, or effective vaccines for SARS. Therefore, developing specific and sensitive laboratory tests for SARS as well as effective vaccines are necessary for national authorities.</p>
</sec>
<sec>
<title>Results</title>
<p>Genes encoding truncated nucleocapsid (N) and spike (S) proteins of
<italic>SARSCoV</italic>
were cloned into the expression vector
<italic>pQE30</italic>
and fusionally expressed in
<italic>Escherichia coli</italic>
M15. The fusion protein was analyzed for reactivity with SARS patients' sera and with anti-sera against the two human coronaviruses
<italic>HCoV</italic>
229E and
<italic>HCoV</italic>
OC43 by ELISA, IFA and immunoblot assays. Furthermore, to evaluate the antigen-specific humoral antibody and T-cell responses in mice, the fusion protein was injected into 6-week-old BALB/c mice and a neutralization test as well as a T-cell analysis was performed. To evaluate the antiviral efficacy of immunization, BALB/c mice were challenged intranasally with
<italic>SARSCoV</italic>
at day 33 post injection and viral loads were determined by fluorescent quantitative RT-PCR. Serological results showed that the diagnostic sensitivity and specificity of the truncated S-N fusion protein derived the SARS virus were > 99% (457/460) and 100.00% (650/650), respectively. Furthermore there was no cross-reactivity with other two human coronaviruses. High titers of antibodies to
<italic>SRASCoV</italic>
appeared in the immunized mice and the neutralization test showed that antibodies to the fusion protein could inhibit
<italic>SARSCoV</italic>
. The T cell proliferation showed that the fusion protein could induce an antigen-specific T-cell response. Fluorescent quantitative RT-PCR showed that BALB/c mice challenged intranasally with
<italic>SARSCoV</italic>
at day 33 post injection were completely protected from virus replication.</p>
</sec>
<sec>
<title>Conclusion</title>
<p>The truncated S-N fusion protein is a suitable immunodiagnostic antigen and vaccine candidate.</p>
</sec>
<sec>
<title>Electronic supplementary material</title>
<p>The online version of this article (doi:10.1186/1471-2180-8-207) contains supplementary material, which is available to authorized users.</p>
</sec>
</div>
</front>
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