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J Virol, January 1998, p. 585-592, Vol. 72, No. 1
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Simian Immunodeficiency Virus (SIV)
Envelope-Specific Fabs with High-Level Homologous Neutralizing
Activity: Recovery from a Long-Term-Nonprogressor SIV-Infected
Macaque
Joakim
Glamann,1
Dennis R.
Burton,2
Paul W. H. I.
Parren,2
Henrik J.
Ditzel,2
Karen A.
Kent,3
Caroline
Arnold,3
David
Montefiori,4 and
Vanessa M.
Hirsch1,*
Immunodeficiency Viruses Section, Laboratory
of Infectious Diseases, National Institute of Allergy and Infectious
Diseases, National Institutes of Health, Rockville, Maryland
208521;
Departments of Immunology and
Molecular Biology, The Scripps Research Institute, La Jolla, California
920372;
NIBSC, Potters Bar, Herts,
United Kingdom3; and
Department of
Surgery, Duke University Medical Center, Durham, North Carolina
277104
Received 22 July 1997/Accepted 19 September 1997
An antibody phage display library was constructed from RNA
extracted from lymph node cells of a simian immunodeficiency virus (SIV)-infected long-term-nonprogressor macaque. Seven gp120-reactive Fabs were obtained by selection of the library against SIV monomeric gp120. Although each of the Fabs was unique in sequence, there were two
distinct groups based on epitope recognition, neutralizing activity in
vitro, and molecular analysis. Group 1 Fabs did not neutralize SIV and
bound to a linear epitope in the V3 loop of the SIV envelope. In
contrast, two of the group 2 Fabs neutralized homologous,
neutralization-sensitive SIVsm isolates with high efficiency but failed
to neutralize heterologous SIVmac isolates. Based on competition
enzyme-linked immunosorbent assays with mouse monoclonal antibodies of
known specificity, these Fabs reacted with a conformational epitope
that includes domains V3 and V4 of the SIV envelope. These neutralizing
and nonneutralizing Fabs provide valuable standardized and renewable
reagents for studying the role of antibody in preventing or modifying
SIV infection in vivo.
*
Corresponding author. Mailing address: NIAID Twinbrook
II Facility, 12441 Parklawn Dr., Rockville, MD 20852. Phone: (301) 496- 2976. Fax: (301) 480-2618. E-mail:
vhirsch{at}atlas.niaid.nih.gov.
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