title: N-linked glycosylation in C2 region of HIV-1 envelope reduces sensitivity to neutralizing antibodies.
abstract: N-linked glycosylation at specific sites on human immunodeficiency virus (HIV)--1 gp120 envelope glycoprotein is believed to act as a glycan shield to protect the viral neutralizing epitopes. Various glycosylation sites have been shown to affect the sensitivity to antibody-mediated neutralization. These include sites on V1V2, C2, base of V3, V5 and C5. Among these, the sites around the base of V3 loop have been most consistently found to associate with neutralization sensitivity in subtype B viruses. In contrast, we found that N-linked glycosylation sites at the junction of V2--C2 and in the middle of C2 were responsible for the neutralization resistance in CRF01_A/E, whereas sites at the base of V3 loop and in V1 and V5 did not affect the neutralization phenotype.
authors.affiliation: Department of Microbiology, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand.
authors.forename: Sirilak
authors.initials: S
authors.lastname: Teeraputon
authors.forename: Suda
authors.initials: S
authors.lastname: Louisirirojchanakul
authors.forename: Prasert
authors.initials: P
authors.lastname: Auewarakul
mesh_terms: D000595:Amino Acid Sequence; D002460:Cell Line; D005260:Female; D006031:Glycosylation; D015483:HIV Antibodies / Q000276:immunology*; D015699:HIV Envelope Protein gp120 / Q000737:chemistry / Q000276:immunology* / Q000378:metabolism*; D015658:HIV Infections / Q000821:virology*; D015497:HIV-1 / Q000145:classification / Q000235:genetics / Q000276:immunology* / Q000302:isolation & purification; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009500:Neutralization Tests; D010446:Peptide Fragments / Q000737:chemistry / Q000276:immunology / Q000378:metabolism; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000821:virology*
chemical_list: D015483:HIV Antibodies; D015699:HIV Envelope Protein gp120; C059762:HIV envelope protein gp120 (305-321); D010446:Peptide Fragments