Accessibility of the high-mannose glycans of glycoprotein gp120 from human immunodeficiency virus type 1 probed by in vitro interaction with mannose-binding lectins.
The direct interaction of mannose-specific plant lectins with gp120 of HIV-1 was studied by surface plasmon resonance. Inhibition experiments indicated that exposed high mannose type glycans play a key role in the interaction. Most of the lectins specifically accommodate outer alpha1,2-, alpha1,3-, or alpha1,6-linked di- or trimannosides, and especially legume lectins, also interact with the trimannoside core of the complex type glycans. The unexpected affinity of some lectins towards gp120 presumably results from conformational differences in their binding sites. These results demonstrate that mannose-specific plant lectins are powerful tools to study the accessibility and elucidate the function of the gp120 glycans in the recognition and infection of the host cells by HIV-1.
Astoul
C H
CH
Institut de Pharmacologie et Biologie Structurale, UMR-CNRS 5089, 205 Route de Narbonne, Toulouse Cedex 4, 31077, France.
Peumans
W J
WJ
Van Damme
E J
EJ
Roug
D001665:Binding Sites; D015374:Biosensing Techniques; D004305:Dose-Response Relationship, Drug; D015699:HIV Envelope Protein gp120 / Q000737:chemistry*; D015497:HIV-1 / Q000737:chemistry*; D037102:Lectins / Q000737:chemistry* / Q000494:pharmacology; D008358:Mannose / Q000737:chemistry*; D008958:Models, Molecular; D011134:Polysaccharides / Q000737:chemistry*; D011485:Protein Binding / Q000187:drug effects / Q000502:physiology; D013379:Substrate Specificity; D020349:Surface Plasmon Resonance
D015699:HIV Envelope Protein gp120; D037102:Lectins; D011134:Polysaccharides; D008358:Mannose