Characterization of human monoclonal antibodies selected with a hypervariable loop-deleted recombinant HIV-1(IIIB) gp120.

Abstract:

:Recombinant gp120 of the HIV-1(IIIB) isolate (BH10 clone) has been mutated to form the PR12 protein with the first 74 C-terminal amino acids and the V1, V2 and V3 hypervariable loops deleted. A variety of studies have shown that the CD4 binding domain (CD4bd) is very well exposed in PR12 in contrast to rgp120(LAI). Using PR12 for selection of human monoclonal antibodies (MAbs) from HIV-infected individuals, five MAbs were generated with specificities to the epitopes overlapping the CD4bd (1570A,1570C,1570D,1595 and 1599). The three MAbs, 1570A, C and D, generated from one HIV-infected individual, represent one MAb as determined by sequence analysis of the V(H)3 region. Since the epitopes overlapping the CD4bd exhibit variability among HIV-1 clades, the specificity of anti-CD4bd MAbs were distinguished by differing patterns of binding to recombinant envelope proteins derived from clade A, B, C, D and E viruses. The PR12-selected MAbs were also compared with a panel of gp120-selected anti-CD4bd MAbs and showed a different range of specificities. MAb 1599 is clade B specific, MAb 1595 reacts with the A, B and D clades, while MAb 1570 recognises the most conserved epitope, as it binds to all proteins. The results show that the exposure of different epitopes in the CD4bd of the PR12 protein allows this protein to serve as an immunogen and to induce anti-CD4bd antibodies.

journal_name

Immunol Lett

journal_title

Immunology letters

authors

Jeffs SA,Gorny MK,Williams C,Revesz K,Volsky B,Burda S,Wang XH,Bandres J,Zolla-Pazner S,Holmes H

doi

10.1016/s0165-2478(01)00289-9

subject

Has Abstract

pub_date

2001-12-03 00:00:00

pages

209-13

issue

3

eissn

0165-2478

issn

1879-0542

pii

S0165247801002899

journal_volume

79

pub_type

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