2ezp
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SOLUTION NMR STRUCTURE OF ECTODOMAIN OF SIV GP41, MODELS 1-10 OF AN ENSEMBLE OF 40 SIMULATED ANNEALING STRUCTURES
OverviewOverview
The solution structure of the ectodomain of simian immunodeficiency virus, (SIV) gp41 (e-gp41), consisting of residues 27-149, has been determined by, multidimensional heteronuclear NMR spectroscopy. SIV e-gp41 is a symmetric, 44 kDa trimer with each subunit consisting of antiparallel N-terminal, (residues 30-80) and C-terminal (residues 107-147) helices connected by a, 26 residue loop (residues 81-106). The N-terminal helices of each subunit, form a parallel coiled-coil structure in the interior of the complex which, is surrounded by the C-terminal helices located on the exterior of the, complex. The loop region is ordered and displays numerous intermolecular, and non-sequential intramolecular contacts. The helical core of SIV e-gp41, is similar to recent X-ray structures of truncated constructs of the, helical core of HIV-1 e-gp41. The present structure establishes, unambiguously the connectivity of the N- and C-terminal helices in the, trimer, and characterizes the conformation of the intervening loop, which, has been implicated by mutagenesis and antibody epitope mapping to play a, key role in gp120 association. In conjunction with previous studies, the, solution structure of the SIV e-gp41 ectodomain provides insight into the, binding site of gp120 and the mechanism of cell fusion. The present, structure of SIV e-gp41 represents one of the largest protein structures, determined by NMR to date.
About this StructureAbout this Structure
2EZP is a Single protein structure of sequence from Simian immunodeficiency virus. Full crystallographic information is available from OCA.
ReferenceReference
Three-dimensional solution structure of the 44 kDa ectodomain of SIV gp41., Caffrey M, Cai M, Kaufman J, Stahl SJ, Wingfield PT, Covell DG, Gronenborn AM, Clore GM, EMBO J. 1998 Aug 17;17(16):4572-84. PMID:9707417
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