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MAb ID	AH48
HXB2 Location	Env	Env Epitope Map
Author Location	gp120 (V3)
Epitope
Ab Type
Neutralizing
Species (Isotype)	human
Patient
Immunogen	HIV-1 infection
Keywords	antibody binding site, antibody interactions, binding affinity, neutralization, variant cross-reactivity

Notes

Showing 3 of 3 notes.

AH48: The study compared Ab neutralization against the JR-FL primary isolate and trimer binding affinities judged by native PAGE. There was direct quantitative relationship between monovalent Fab-trimer binding and neutralization, implying that neutralization begins as each trimer is occupied by one Ab. In BN-PAGE, neutralizing Fabs and sCD4 were able to shift JR-FL trimers, In contrast, most non-neutralizing Fabs, AH48 in particular, bound to monomer, but their epitopes were conformationally occluded on trimers, confirming the exclusive relationship of trimer binding and neutralization. Crooks2008 (antibody binding site, neutralization, binding affinity)
AH48: This Ab was shown not to react with C clade gp140 (97CN54). Sheppard2007a (variant cross-reactivity)
AH-48: scFv 4KG5 reacts with a conformational epitope that is formed by the V1V2 and V3 loops and the bridging sheet (C4) region of gp120 and is influenced by carbohydrates. Of a panel of MAbs tested, only NAb b12 enhanced 4KG5 binding to gp120 JRFL. MAbs to the following regions diminished 4KG5 binding: V2 loop, V3 loop, V3-C4 region, CD4BS. MAbs directed against C1, CD4i, C5 regions didn't impact 4KG5 binding. These results suggest that the orientation or dynamics of the V1/V2 and V3 loops restricts CD4BS access on the envelope spike, and IgG1b12 can uniquely remain unaffected by these loops. AH48 is a novel anti-V3 Fab first used in this study. Zwick2003a (antibody interactions)

References

Showing 3 of 3 references.

Zwick2003a Michael B. Zwick, Robert Kelleher, Richard Jensen, Aran F. Labrijn, Meng Wang, Gerald V. Quinnan, Jr., Paul W. H. I. Parren, and Dennis R. Burton. A Novel Human Antibody against Human Immunodeficiency Virus Type 1 gp120 Is V1, V2, and V3 Loop Dependent and Helps Delimit the Epitope of the Broadly Neutralizing Antibody Immunoglobulin G1 b12. J. Virol., 77(12):6965-6978, Jun 2003. PubMed ID: 12768015. Show all entries for this paper.

Sheppard2007a Neil C. Sheppard, Sarah L. Davies, Simon A. Jeffs, Sueli M. Vieira, and Quentin J. Sattentau. Production and Characterization of High-Affinity Human Monoclonal Antibodies to Human Immunodeficiency Virus Type 1 Envelope Glycoproteins in a Mouse Model Expressing Human Immunoglobulins. Clin. Vaccine Immunol., 14(2):157-167, Feb 2007. PubMed ID: 17167037. Show all entries for this paper.

Crooks2008 Emma T. Crooks, Pengfei Jiang, Michael Franti, Sharon Wong, Michael B. Zwick, James A. Hoxie, James E. Robinson, Penny L. Moore, and James M. Binley. Relationship of HIV-1 and SIV Envelope Glycoprotein Trimer Occupation and Neutralization. Virology, 377(2):364-378, 1 Aug 2008. PubMed ID: 18539308. Show all entries for this paper.