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Journal of Virology, November 2001, p. 10892-10905, Vol. 75, No. 22
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.22.10892-10905.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Broadly Neutralizing Antibodies Targeted to the Membrane-Proximal
External Region of Human Immunodeficiency Virus Type 1 Glycoprotein gp41
Michael B.
Zwick,1
Aran F.
Labrijn,1
Meng
Wang,1
Catherine
Spenlehauer,2
Erica Ollmann
Saphire,1
James M.
Binley,2,
John P.
Moore,2
Gabriela
Stiegler,3
Hermann
Katinger,3
Dennis R.
Burton,1,* and
Paul
W. H. I.
Parren1,*
Departments of Immunology and Molecular Biology, The
Scripps Research Institute, La Jolla,
California1; Department of Microbiology
and Immunology, Weill Medical College of Cornell University, New York,
New York2; and Institute for Applied
Microbiology, University of Agriculture, Vienna,
Austria3
Received 9 May 2001/Accepted 30 July 2001
The identification and epitope mapping of broadly neutralizing
anti-human immunodeficiency virus type 1 (HIV-1) antibodies (Abs) is
important for vaccine design, but, despite much effort, very few such
Abs have been forthcoming. Only one broadly neutralizing anti-gp41
monoclonal Ab (MAb), 2F5, has been described. Here we report on two
MAbs that recognize a region immediately C-terminal of the 2F5 epitope.
Both MAbs were generated from HIV-1-seropositive donors, one (Z13) from
an antibody phage display library, and one (4E10) as a hybridoma. Both
MAbs recognize a predominantly linear and relatively conserved epitope,
compete with each other for binding to synthetic peptide derived from
gp41, and bind to HIV-1MN virions. By flow cytometry, these
MAbs appear to bind relatively weakly to infected cells and this
binding is not perturbed by pretreatment of the infected cells with
soluble CD4. Despite the apparent linear nature of the epitopes of Z13
and 4E10, denaturation of recombinant envelope protein reduces the
binding of these MAbs, suggesting some conformational requirements for
full epitope expression. Most significantly, Z13 and 4E10 are able to
neutralize selected primary isolates from diverse subtypes of HIV-1
(e.g., subtypes B, C, and E). The results suggest that a rather
extensive region of gp41 close to the transmembrane domain is
accessible to neutralizing Abs and could form a useful target for
vaccine design.
*
Corresponding authors. Mailing address for Paul W. H. I. Parren: Department of Immunology (IMM-2), The Scripps Research
Institute 10550 North Torrey Pines Rd., La Jolla, CA 92037. Phone:
(858) 784-8602. Fax: (858) 784-8360. E-mail:
parren{at}scripps.edu. Phone for Dennis R. Burton: (858)
784-9298. Fax: (858) 784-8360. E-mail: burton{at}scripps.edu.

Present address: Department of Immunology, The Scripps Research
Institute, La Jolla, CA
92037.
Journal of Virology, November 2001, p. 10892-10905, Vol. 75, No. 22
0022-538X/01/$04.00+0 DOI: 10.1128/JVI.75.22.10892-10905.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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Schulke, N., Vesanen, M. S., Sanders, R. W., Zhu, P., Lu, M., Anselma, D. J., Villa, A. R., Parren, P. W. H. I., Binley, J. M., Roux, K. H., Maddon, P. J., Moore, J. P., Olson, W. C.
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