Vaccine-elicited primate antibodies use a distinct approach to the HIV-1 primary receptor binding site informing vaccine redesign

HIV-1 neutralization requires Ab accessibility to the functional envelope glycoprotein (Env) spike. We recently reported the isolation of previously unidentified vaccine-elicited, CD4 binding site (CD4bs)-directed mAbs from rhesus macaques immunized with soluble Env trimers, indicating that this reg...

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Veröffentlicht in:Proc. Natl. Acad. Sci. USA 2014-02, Vol.111 (7), p.E738-E747
Hauptverfasser: Tran, Karen, Poulsen, Christian, Guenaga, Javier, de Val, Natalia, de Val Alda, Natalia, Wilson, Richard, Sundling, Christopher, Li, Yuxing, Stanfield, Robyn L, Wilson, Ian A, Ward, Andrew B, Karlsson Hedestam, Gunilla B, Wyatt, Richard T
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container_end_page E747
container_issue 7
container_start_page E738
container_title Proc. Natl. Acad. Sci. USA
container_volume 111
creator Tran, Karen
Poulsen, Christian
Guenaga, Javier
de Val, Natalia
de Val Alda, Natalia
Wilson, Richard
Sundling, Christopher
Li, Yuxing
Stanfield, Robyn L
Wilson, Ian A
Ward, Andrew B
Karlsson Hedestam, Gunilla B
Wyatt, Richard T
description HIV-1 neutralization requires Ab accessibility to the functional envelope glycoprotein (Env) spike. We recently reported the isolation of previously unidentified vaccine-elicited, CD4 binding site (CD4bs)-directed mAbs from rhesus macaques immunized with soluble Env trimers, indicating that this region is immunogenic in the context of subunit vaccination. To elucidate the interaction of the trimer-elicited mAbs with gp120 and their insufficient interaction with the HIV-1 primary isolate spike, we crystallized the Fab fragments of two mAbs, GE136 and GE148. Alanine scanning of their complementarity-determining regions, coupled with epitope scanning of their epitopes on gp120, revealed putative contact residues at the Ab/gp120 interface. Docking of the GE136 and GE148 Fabs to gp120, coupled with EM reconstructions of these nonbroadly neutralizing mAbs (non-bNAbs) binding to gp120 monomers and EM modeling to well-ordered trimers, suggested Ab approach to the CD4bs by a vertical angle of access relative to the more lateral mode of interaction used by the CD4bs-directed bNAbs VRC01 and PGV04. Fitting the structures into the available cryo-EM native spike density indicated clashes between these two vaccine-elicited mAbs and the topside variable region spike cap, whereas the bNAbs duck under this quaternary shield to access the CD4bs effectively on primary HIV isolates. These results provide a structural basis for the limited neutralizing breadth observed by current vaccine-induced, CD4bs-directed Abs and highlight the need for better ordered trimer immunogens. The analysis presented here therefore provides valuable information to guide HIV-1 vaccine immunogen redesign.
doi_str_mv 10.1073/pnas.1319512111
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(ANL), Argonne, IL (United States). Advanced Photon Source (APS)</creatorcontrib><description>HIV-1 neutralization requires Ab accessibility to the functional envelope glycoprotein (Env) spike. We recently reported the isolation of previously unidentified vaccine-elicited, CD4 binding site (CD4bs)-directed mAbs from rhesus macaques immunized with soluble Env trimers, indicating that this region is immunogenic in the context of subunit vaccination. To elucidate the interaction of the trimer-elicited mAbs with gp120 and their insufficient interaction with the HIV-1 primary isolate spike, we crystallized the Fab fragments of two mAbs, GE136 and GE148. Alanine scanning of their complementarity-determining regions, coupled with epitope scanning of their epitopes on gp120, revealed putative contact residues at the Ab/gp120 interface. Docking of the GE136 and GE148 Fabs to gp120, coupled with EM reconstructions of these nonbroadly neutralizing mAbs (non-bNAbs) binding to gp120 monomers and EM modeling to well-ordered trimers, suggested Ab approach to the CD4bs by a vertical angle of access relative to the more lateral mode of interaction used by the CD4bs-directed bNAbs VRC01 and PGV04. Fitting the structures into the available cryo-EM native spike density indicated clashes between these two vaccine-elicited mAbs and the topside variable region spike cap, whereas the bNAbs duck under this quaternary shield to access the CD4bs effectively on primary HIV isolates. These results provide a structural basis for the limited neutralizing breadth observed by current vaccine-induced, CD4bs-directed Abs and highlight the need for better ordered trimer immunogens. 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(ANL), Argonne, IL (United States). Advanced Photon Source (APS)</creatorcontrib><title>Vaccine-elicited primate antibodies use a distinct approach to the HIV-1 primary receptor binding site informing vaccine redesign</title><title>Proc. Natl. Acad. Sci. USA</title><addtitle>Proc Natl Acad Sci U S A</addtitle><description>HIV-1 neutralization requires Ab accessibility to the functional envelope glycoprotein (Env) spike. We recently reported the isolation of previously unidentified vaccine-elicited, CD4 binding site (CD4bs)-directed mAbs from rhesus macaques immunized with soluble Env trimers, indicating that this region is immunogenic in the context of subunit vaccination. To elucidate the interaction of the trimer-elicited mAbs with gp120 and their insufficient interaction with the HIV-1 primary isolate spike, we crystallized the Fab fragments of two mAbs, GE136 and GE148. Alanine scanning of their complementarity-determining regions, coupled with epitope scanning of their epitopes on gp120, revealed putative contact residues at the Ab/gp120 interface. Docking of the GE136 and GE148 Fabs to gp120, coupled with EM reconstructions of these nonbroadly neutralizing mAbs (non-bNAbs) binding to gp120 monomers and EM modeling to well-ordered trimers, suggested Ab approach to the CD4bs by a vertical angle of access relative to the more lateral mode of interaction used by the CD4bs-directed bNAbs VRC01 and PGV04. Fitting the structures into the available cryo-EM native spike density indicated clashes between these two vaccine-elicited mAbs and the topside variable region spike cap, whereas the bNAbs duck under this quaternary shield to access the CD4bs effectively on primary HIV isolates. 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Natl. Acad. Sci. USA</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Tran, Karen</au><au>Poulsen, Christian</au><au>Guenaga, Javier</au><au>de Val, Natalia</au><au>de Val Alda, Natalia</au><au>Wilson, Richard</au><au>Sundling, Christopher</au><au>Li, Yuxing</au><au>Stanfield, Robyn L</au><au>Wilson, Ian A</au><au>Ward, Andrew B</au><au>Karlsson Hedestam, Gunilla B</au><au>Wyatt, Richard T</au><aucorp>Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)</aucorp><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Vaccine-elicited primate antibodies use a distinct approach to the HIV-1 primary receptor binding site informing vaccine redesign</atitle><jtitle>Proc. Natl. Acad. Sci. USA</jtitle><addtitle>Proc Natl Acad Sci U S A</addtitle><date>2014-02-18</date><risdate>2014</risdate><volume>111</volume><issue>7</issue><spage>E738</spage><epage>E747</epage><pages>E738-E747</pages><issn>0027-8424</issn><eissn>1091-6490</eissn><abstract>HIV-1 neutralization requires Ab accessibility to the functional envelope glycoprotein (Env) spike. We recently reported the isolation of previously unidentified vaccine-elicited, CD4 binding site (CD4bs)-directed mAbs from rhesus macaques immunized with soluble Env trimers, indicating that this region is immunogenic in the context of subunit vaccination. To elucidate the interaction of the trimer-elicited mAbs with gp120 and their insufficient interaction with the HIV-1 primary isolate spike, we crystallized the Fab fragments of two mAbs, GE136 and GE148. Alanine scanning of their complementarity-determining regions, coupled with epitope scanning of their epitopes on gp120, revealed putative contact residues at the Ab/gp120 interface. Docking of the GE136 and GE148 Fabs to gp120, coupled with EM reconstructions of these nonbroadly neutralizing mAbs (non-bNAbs) binding to gp120 monomers and EM modeling to well-ordered trimers, suggested Ab approach to the CD4bs by a vertical angle of access relative to the more lateral mode of interaction used by the CD4bs-directed bNAbs VRC01 and PGV04. Fitting the structures into the available cryo-EM native spike density indicated clashes between these two vaccine-elicited mAbs and the topside variable region spike cap, whereas the bNAbs duck under this quaternary shield to access the CD4bs effectively on primary HIV isolates. 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subjects AIDS Vaccines - biosynthesis
AIDS Vaccines - immunology
alanine
Animals
antibodies
Antibodies, Monoclonal - biosynthesis
Antibodies, Monoclonal - chemistry
Antibodies, Monoclonal - immunology
Antibodies, Neutralizing - biosynthesis
Antibodies, Neutralizing - chemistry
Antibodies, Neutralizing - immunology
Binding sites
Binding Sites - genetics
Biological Sciences
CD4 Antigens - genetics
CD4 Antigens - metabolism
Crystallization
Drug Design
ducks
env Gene Products, Human Immunodeficiency Virus - genetics
epitopes
Glycoproteins
HIV
HIV-1 - immunology
Human immunodeficiency virus
Human immunodeficiency virus 1
Humans
Immunization
Immunoglobulin Fab Fragments - genetics
Immunoglobulin Fab Fragments - metabolism
Macaca mulatta
Macaca mulatta - immunology
Microscopy, Interference
Models, Molecular
Monkeys & apes
neutralization
Neutralization Tests
PNAS Plus
Primates
Protein Conformation
vaccination
Vaccines
title Vaccine-elicited primate antibodies use a distinct approach to the HIV-1 primary receptor binding site informing vaccine redesign
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