2siv
From Proteopedia
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SIV GP41 CORE STRUCTURE
Overview
The gp41 subunit of the envelope protein complex from human and simian, immunodeficiency viruses (HIV and SIV) mediates membrane fusion during, viral entry. The crystal structure of the HIV-1 gp41 ectodomain core in, its proposed fusion-active state is a six-helix bundle. Here we have, reconstituted the core of the SIV gp41 ectodomain with two synthetic, peptides called SIV N36 and SIV C34, which form a highly helical trimer of, heterodimers. The 2.2 A resolution crystal structure of this SIV N36/C34, complex is very similar to the analogous structure in HIV-1 gp41. In both, structures, three N36 helices form a central trimeric coiled coil. Three, C34 helices pack in an antiparallel orientation into highly conserved, hydrophobic grooves along the surface of this coiled coil. The conserved, nature of the N36-C34 interface suggests that the HIV-1 and SIV peptides, are functionally interchangeable. Indeed, a heterotypic complex between, HIV-1 N36 and SIV C34 peptides is highly helical and stable. Moreover, as, with HIV-1 C34, the SIV C34 peptide is a potent inhibitor of HIV-1, infection. These results identify conserved packing interactions between, the N and C helices of gp41 and have implications for the development of C, peptide analogs with broad inhibitory activity.
About this Structure
2SIV is a Protein complex structure of sequences from Simian immunodeficiency virus with ACE and NH2 as ligands. Full crystallographic information is available from OCA.
Reference
Crystal structure of the simian immunodeficiency virus (SIV) gp41 core: conserved helical interactions underlie the broad inhibitory activity of gp41 peptides., Malashkevich VN, Chan DC, Chutkowski CT, Kim PS, Proc Natl Acad Sci U S A. 1998 Aug 4;95(16):9134-9. PMID:9689046
Page seeded by OCA on Thu Nov 8 14:57:32 2007
