SrasV1, 2020, Analysis, bibRecord, 000A79

Antibody-mediated synergy and interference in the neutralization of SARS-CoV at an epitope cluster on the spike protein.

Identifieur interne : 000A79 ( 2020/Analysis ); précédent : 000A78; suivant : 000A80

Antibody-mediated synergy and interference in the neutralization of SARS-CoV at an epitope cluster on the spike protein.

Auteurs : Lilin Zhong [États-Unis] ; Lia Haynes ; Evi Budo Struble ; Azaibi Tamin ; Maria Luisa Virata-Theimer ; Pei Zhang

Source :

Biochemical and biophysical research communications [ 1090-2104 ] ; 2009.

RBID : pubmed:19861118

Descripteurs français

English descriptors

KwdEn :
- Amino Acid Sequence, Antibodies, Neutralizing (immunology), Antibodies, Viral (immunology), Epitope Mapping, Epitopes (chemistry), Epitopes (immunology), Humans, Membrane Glycoproteins (immunology), Neutralization Tests, SARS Virus (immunology), Severe Acute Respiratory Syndrome (immunology), Severe Acute Respiratory Syndrome (virology), Spike Glycoprotein, Coronavirus, Viral Envelope Proteins (immunology).
MESH :
- chemical , chemistry : Epitopes.
- chemical , immunology : Antibodies, Neutralizing, Antibodies, Viral, Epitopes, Membrane Glycoproteins, Viral Envelope Proteins.
- immunology : SARS Virus, Severe Acute Respiratory Syndrome.
- virology : Severe Acute Respiratory Syndrome.
- Amino Acid Sequence, Epitope Mapping, Humans, Neutralization Tests, Spike Glycoprotein, Coronavirus.

Abstract

Incomplete neutralization of virus, especially when it occurs in the presence of excess neutralizing antibody, represents a biological phenomenon that impacts greatly on antibody-mediated immune prophylaxis of viral infection and on successful vaccine design. To understand the mechanism by which a virus escapes from antibody-mediated neutralization, we have investigated the interactions of non-neutralizing and neutralizing antibodies at an epitope cluster on the spike protein of severe acute respiratory syndrome coronavirus (SARS-CoV). The epitope cluster was mapped at the C-terminus of the spike protein; it consists of structurally intertwined epitopes recognized by two neutralizing monoclonal antibodies (mAbs), 341C and 540C, and a non-neutralizing mAb, 240C. While mAb 341C binds to a mostly linear epitope composed of residues (507)PAT(509) and V(349), mAb 240C binds to an epitope that partially overlaps the former by at least two residues (P(507) and A(508)). The epitope corresponding to mAb 540C is a conformational one, involving residues L(504) and N(505). In neutralization assays, non-neutralizing 240C disrupted virus neutralization by mAb 341C and/or mAb 540C, whereas a combination of mAbs 341C and 540C blocked virus infectivity synergistically. These findings indicate that the epitope cluster on the spike protein may serve as an evolutionarily conserved platform at which a dynamic interplay between neutralizing and non-neutralizing antibodies occurs, thereby determining the outcome of SARS-CoV infection.

DOI: 10.1016/j.bbrc.2009.10.115
PubMed: 19861118

Affiliations:

Links to Exploration step

pubmed:19861118

Le document en format XML

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<front><div type="abstract" xml:lang="en">Incomplete neutralization of virus, especially when it occurs in the presence of excess neutralizing antibody, represents a biological phenomenon that impacts greatly on antibody-mediated immune prophylaxis of viral infection and on successful vaccine design. To understand the mechanism by which a virus escapes from antibody-mediated neutralization, we have investigated the interactions of non-neutralizing and neutralizing antibodies at an epitope cluster on the spike protein of severe acute respiratory syndrome coronavirus (SARS-CoV). The epitope cluster was mapped at the C-terminus of the spike protein; it consists of structurally intertwined epitopes recognized by two neutralizing monoclonal antibodies (mAbs), 341C and 540C, and a non-neutralizing mAb, 240C. While mAb 341C binds to a mostly linear epitope composed of residues (507)PAT(509) and V(349), mAb 240C binds to an epitope that partially overlaps the former by at least two residues (P(507) and A(508)). The epitope corresponding to mAb 540C is a conformational one, involving residues L(504) and N(505). In neutralization assays, non-neutralizing 240C disrupted virus neutralization by mAb 341C and/or mAb 540C, whereas a combination of mAbs 341C and 540C blocked virus infectivity synergistically. These findings indicate that the epitope cluster on the spike protein may serve as an evolutionarily conserved platform at which a dynamic interplay between neutralizing and non-neutralizing antibodies occurs, thereby determining the outcome of SARS-CoV infection.</div>
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Antibody-mediated synergy and interference in the neutralization of SARS-CoV at an epitope cluster on the spike protein.

Antibody-mediated synergy and interference in the neutralization of SARS-CoV at an epitope cluster on the spike protein.

Source :

Descripteurs français

English descriptors

Abstract

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

Links to Exploration step

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Pour manipuler ce document sous Unix (Dilib)

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