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'''CRYSTAL STRUCTURE OF THE HIV-1 INTEGRASE CATALYTIC CORE DOMAIN''' | '''CRYSTAL STRUCTURE OF THE HIV-1 INTEGRASE CATALYTIC CORE DOMAIN''' | ||
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[[Category: Stroud, R M.]] | [[Category: Stroud, R M.]] | ||
[[Category: Tang, A H.]] | [[Category: Tang, A H.]] | ||
[[Category: | [[Category: Dd35e]] | ||
[[Category: | [[Category: Dna-binding protein]] | ||
[[Category: | [[Category: Hiv-1 integrase]] | ||
[[Category: | [[Category: Polynucleotidyl transferase]] | ||
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Revision as of 15:38, 2 May 2008
CRYSTAL STRUCTURE OF THE HIV-1 INTEGRASE CATALYTIC CORE DOMAIN
OverviewOverview
Insolubility of full-length HIV-1 integrase (IN) limited previous structure analyses to individual domains. By introducing five point mutations, we engineered a more soluble IN that allowed us to generate multidomain HIV-1 IN crystals. The first multidomain HIV-1 IN structure is reported. It incorporates the catalytic core and C-terminal domains (residues 52-288). The structure resolved to 2.8 A is a Y-shaped dimer. Within the dimer, the catalytic core domains form the only dimer interface, and the C-terminal domains are located 55 A apart. A 26-aa alpha-helix, alpha6, links the C-terminal domain to the catalytic core. A kink in one of the two alpha6 helices occurs near a known proteolytic site, suggesting that it may act as a flexible elbow to reorient the domains during the integration process. Two proteins that bind DNA in a sequence-independent manner are structurally homologous to the HIV-1 IN C-terminal domain, suggesting a similar protein-DNA interaction in which the IN C-terminal domain may serve to bind, bend, and orient viral DNA during integration. A strip of positively charged amino acids contributed by both monomers emerges from each active site of the dimer, suggesting a minimally dimeric platform for binding each viral DNA end. The crystal structure of the isolated catalytic core domain (residues 52-210), independently determined at 1.6-A resolution, is identical to the core domain within the two-domain 52-288 structure.
About this StructureAbout this Structure
1EXQ is a Single protein structure of sequence from Human immunodeficiency virus 1. Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of the HIV-1 integrase catalytic core and C-terminal domains: a model for viral DNA binding., Chen JC, Krucinski J, Miercke LJ, Finer-Moore JS, Tang AH, Leavitt AD, Stroud RM, Proc Natl Acad Sci U S A. 2000 Jul 18;97(15):8233-8. PMID:10890912 Page seeded by OCA on Fri May 2 15:38:51 2008