Hiv env proteins

spinqualitylabelsall models Structure of HMG-CoA reductase (PDB entry 1dq8) Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Introduction Human Immunodeficiency Virus (HIV) is a retrovirus/lentivirus that expresses a spike protein on its viral envelope (Env). "The envelope protein is synthesized as a precursor, gp160, which trimerizes and undergoes cleavage into two noncovalently associated fragments, the receptor-binding fragment gp120 and the fusion fragment gp41" . Thus, Env is a heterodimer consisting of gp120 and gp41 and forms trimers on the surface of the viral membrane. As "the sole antigen on the virion surface," an understanding of Env (gp 120 & 41) and the conformational changes that occur in gp120 and gp41 during binding and fusion, respectively, is necessary in developing new fusion inhibitors and possible vaccines . The protein structure shown on the right is the gp120 portion of Env in its unbound trimer state . Env Structure The viral Env protein, as mentioned above, is composed of gp120 and gp41 that forms trimers on the viral membrane surface. File:HIV-1 Spike with b12- Fab.png gp120 Binding gp120 is responsible for the binding of HIV to CD4 cells. "Binding of gp120 to the primary receptor CD4 and coreceptor (for example, CCR5 and CXCR4) induces large conformational changes, which then trigger dissociation of gp120 and a cascade of refolding events in gp41" .

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Nicholas Flores, Michal Harel, Alexander Berchansky