Molecular structures of trimeric HIV-1 Env in complex with small antibody derivatives

Joel R. Meyerson, Erin E H Tran, Oleg Kuybeda, Weizao Chen, Dimiter S. Dimitrov, Andrea Gorlani, Theo Verrips, Jeffrey D. Lifson, Sriram Subramaniam

Research output: Contribution to journalArticle

Abstract

The extensive carbohydrate coat, the variability of protein structural features on HIV-1 envelope glycoproteins (Env), and the steric constraints of the virus-cell interface during infection, present challenges to the elicitation of effective full-length (∼150 kDa), neutralizing antibodies against HIV. These hurdles have motivated the engineering of smaller antibody derivatives that can bind Env and neutralize the virus. To further understand the mechanisms by which these proteins neutralize HIV-1, we carried out cryoelectron tomography of native HIV-1 BaL virions complexed separately to two small (∼15 kDa) HIV-neutralizing proteins: A12, which binds the CD4-binding site on Env, and m36, whose binding to Env is enhanced by CD4 binding. We show that despite their small size, the presence of these proteins and their effects on the quaternary conformation of trimeric Env can be visualized in molecular structures derived by cryoelectron tomography combined with subvolume averaging. Binding of Env to A12 results in a conformational change that is comparable to changes observed upon its binding to the CD4-binding site antibody, b12. In contrast, binding of Env to m36 results in an "open" quaternary conformation similar to that seen with binding of soluble CD4 or the CD4i antibody, 17b. Because these small neutralizing proteins are less sterically hindered than full-length antibodies at zones of virus-cell contact, the finding that their binding has the same structural consequences as that of other broadly neutralizing antibodies highlights their potential for use in therapeutic applications.

Original languageEnglish (US)
Pages (from-to)513-518
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume110
Issue number2
DOIs
StatePublished - Jan 8 2013
Externally publishedYes

Fingerprint

Molecular Structure
HIV-1
compound A 12
Viruses
Neutralizing Antibodies
Antibodies
Tomography
env Gene Products
Antibody Binding Sites
Human Immunodeficiency Virus Proteins
Proteins
Capsid Proteins
Therapeutic Uses
Virion
Binding Sites
Carbohydrates
HIV
Infection

Keywords

  • AIDS vaccine
  • Cryoelectron microscopy
  • gp120
  • gp41
  • Virus entry

ASJC Scopus subject areas

  • General

Cite this

Molecular structures of trimeric HIV-1 Env in complex with small antibody derivatives. / Meyerson, Joel R.; Tran, Erin E H; Kuybeda, Oleg; Chen, Weizao; Dimitrov, Dimiter S.; Gorlani, Andrea; Verrips, Theo; Lifson, Jeffrey D.; Subramaniam, Sriram.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 110, No. 2, 08.01.2013, p. 513-518.

Research output: Contribution to journalArticle

Meyerson, JR, Tran, EEH, Kuybeda, O, Chen, W, Dimitrov, DS, Gorlani, A, Verrips, T, Lifson, JD & Subramaniam, S 2013, 'Molecular structures of trimeric HIV-1 Env in complex with small antibody derivatives', Proceedings of the National Academy of Sciences of the United States of America, vol. 110, no. 2, pp. 513-518. https://doi.org/10.1073/pnas.1214810110
Meyerson, Joel R. ; Tran, Erin E H ; Kuybeda, Oleg ; Chen, Weizao ; Dimitrov, Dimiter S. ; Gorlani, Andrea ; Verrips, Theo ; Lifson, Jeffrey D. ; Subramaniam, Sriram. / Molecular structures of trimeric HIV-1 Env in complex with small antibody derivatives. In: Proceedings of the National Academy of Sciences of the United States of America. 2013 ; Vol. 110, No. 2. pp. 513-518.
@article{ee414b2f690941c3a14afdb6db6ed246,
title = "Molecular structures of trimeric HIV-1 Env in complex with small antibody derivatives",
abstract = "The extensive carbohydrate coat, the variability of protein structural features on HIV-1 envelope glycoproteins (Env), and the steric constraints of the virus-cell interface during infection, present challenges to the elicitation of effective full-length (∼150 kDa), neutralizing antibodies against HIV. These hurdles have motivated the engineering of smaller antibody derivatives that can bind Env and neutralize the virus. To further understand the mechanisms by which these proteins neutralize HIV-1, we carried out cryoelectron tomography of native HIV-1 BaL virions complexed separately to two small (∼15 kDa) HIV-neutralizing proteins: A12, which binds the CD4-binding site on Env, and m36, whose binding to Env is enhanced by CD4 binding. We show that despite their small size, the presence of these proteins and their effects on the quaternary conformation of trimeric Env can be visualized in molecular structures derived by cryoelectron tomography combined with subvolume averaging. Binding of Env to A12 results in a conformational change that is comparable to changes observed upon its binding to the CD4-binding site antibody, b12. In contrast, binding of Env to m36 results in an {"}open{"} quaternary conformation similar to that seen with binding of soluble CD4 or the CD4i antibody, 17b. Because these small neutralizing proteins are less sterically hindered than full-length antibodies at zones of virus-cell contact, the finding that their binding has the same structural consequences as that of other broadly neutralizing antibodies highlights their potential for use in therapeutic applications.",
keywords = "AIDS vaccine, Cryoelectron microscopy, gp120, gp41, Virus entry",
author = "Meyerson, {Joel R.} and Tran, {Erin E H} and Oleg Kuybeda and Weizao Chen and Dimitrov, {Dimiter S.} and Andrea Gorlani and Theo Verrips and Lifson, {Jeffrey D.} and Sriram Subramaniam",
year = "2013",
month = "1",
day = "8",
doi = "10.1073/pnas.1214810110",
language = "English (US)",
volume = "110",
pages = "513--518",
journal = "Proceedings of the National Academy of Sciences of the United States of America",
issn = "0027-8424",
number = "2",

}

TY - JOUR

T1 - Molecular structures of trimeric HIV-1 Env in complex with small antibody derivatives

AU - Meyerson, Joel R.

AU - Tran, Erin E H

AU - Kuybeda, Oleg

AU - Chen, Weizao

AU - Dimitrov, Dimiter S.

AU - Gorlani, Andrea

AU - Verrips, Theo

AU - Lifson, Jeffrey D.

AU - Subramaniam, Sriram

PY - 2013/1/8

Y1 - 2013/1/8

N2 - The extensive carbohydrate coat, the variability of protein structural features on HIV-1 envelope glycoproteins (Env), and the steric constraints of the virus-cell interface during infection, present challenges to the elicitation of effective full-length (∼150 kDa), neutralizing antibodies against HIV. These hurdles have motivated the engineering of smaller antibody derivatives that can bind Env and neutralize the virus. To further understand the mechanisms by which these proteins neutralize HIV-1, we carried out cryoelectron tomography of native HIV-1 BaL virions complexed separately to two small (∼15 kDa) HIV-neutralizing proteins: A12, which binds the CD4-binding site on Env, and m36, whose binding to Env is enhanced by CD4 binding. We show that despite their small size, the presence of these proteins and their effects on the quaternary conformation of trimeric Env can be visualized in molecular structures derived by cryoelectron tomography combined with subvolume averaging. Binding of Env to A12 results in a conformational change that is comparable to changes observed upon its binding to the CD4-binding site antibody, b12. In contrast, binding of Env to m36 results in an "open" quaternary conformation similar to that seen with binding of soluble CD4 or the CD4i antibody, 17b. Because these small neutralizing proteins are less sterically hindered than full-length antibodies at zones of virus-cell contact, the finding that their binding has the same structural consequences as that of other broadly neutralizing antibodies highlights their potential for use in therapeutic applications.

AB - The extensive carbohydrate coat, the variability of protein structural features on HIV-1 envelope glycoproteins (Env), and the steric constraints of the virus-cell interface during infection, present challenges to the elicitation of effective full-length (∼150 kDa), neutralizing antibodies against HIV. These hurdles have motivated the engineering of smaller antibody derivatives that can bind Env and neutralize the virus. To further understand the mechanisms by which these proteins neutralize HIV-1, we carried out cryoelectron tomography of native HIV-1 BaL virions complexed separately to two small (∼15 kDa) HIV-neutralizing proteins: A12, which binds the CD4-binding site on Env, and m36, whose binding to Env is enhanced by CD4 binding. We show that despite their small size, the presence of these proteins and their effects on the quaternary conformation of trimeric Env can be visualized in molecular structures derived by cryoelectron tomography combined with subvolume averaging. Binding of Env to A12 results in a conformational change that is comparable to changes observed upon its binding to the CD4-binding site antibody, b12. In contrast, binding of Env to m36 results in an "open" quaternary conformation similar to that seen with binding of soluble CD4 or the CD4i antibody, 17b. Because these small neutralizing proteins are less sterically hindered than full-length antibodies at zones of virus-cell contact, the finding that their binding has the same structural consequences as that of other broadly neutralizing antibodies highlights their potential for use in therapeutic applications.

KW - AIDS vaccine

KW - Cryoelectron microscopy

KW - gp120

KW - gp41

KW - Virus entry

UR - http://www.scopus.com/inward/record.url?scp=84872189908&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84872189908&partnerID=8YFLogxK

U2 - 10.1073/pnas.1214810110

DO - 10.1073/pnas.1214810110

M3 - Article

C2 - 23267106

AN - SCOPUS:84872189908

VL - 110

SP - 513

EP - 518

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

SN - 0027-8424

IS - 2

ER -