2e1f
From Proteopedia
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'''Crystal structure of the HRDC Domain of Human Werner Syndrome Protein, WRN''' | '''Crystal structure of the HRDC Domain of Human Werner Syndrome Protein, WRN''' | ||
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[[Category: Kitano, K.]] | [[Category: Kitano, K.]] | ||
[[Category: Yoshihara, N.]] | [[Category: Yoshihara, N.]] | ||
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Revision as of 22:45, 3 May 2008
Crystal structure of the HRDC Domain of Human Werner Syndrome Protein, WRN
Overview
Werner syndrome is a human premature aging disorder characterized by chromosomal instability. The disease is caused by the functional loss of WRN, a member of the RecQ-helicase family that plays an important role in DNA metabolic pathways. WRN contains four structurally folded domains comprising an exonuclease, a helicase, a winged-helix, and a helicase-and-ribonuclease D/C-terminal (HRDC) domain. In contrast to the accumulated knowledge pertaining to the biochemical functions of the three N-terminal domains, the function of C-terminal HRDC remains unknown. In this study, the crystal structure of the human WRN HRDC domain has been determined. The domain forms a bundle of alpha-helices similar to those of Saccharomyces cerevisiae Sgs1 and Escherichia coli RecQ. Surprisingly, the extra ten residues at each of the N and C termini of the domain were found to participate in the domain architecture by forming an extended portion of the first helix alpha1, and a novel looping motif that traverses straight along the domain surface, respectively. The motifs combine to increase the domain surface of WRN HRDC, which is larger than that of Sgs1 and E. coli.In WRN HRDC, neither of the proposed DNA-binding surfaces in Sgs1 or E. coli is conserved, and the domain was shown to lack DNA-binding ability in vitro. Moreover, the domain was shown to be thermostable and resistant to protease digestion, implying independent domain evolution in WRN. Coupled with the unique long linker region in WRN, the WRN HRDC may be adapted to play a distinct function in WRN that involves protein-protein interactions.
About this Structure
2E1F is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Crystal structure of the HRDC domain of human Werner syndrome protein, WRN., Kitano K, Yoshihara N, Hakoshima T, J Biol Chem. 2007 Jan 26;282(4):2717-28. Epub 2006 Dec 4. PMID:17148451 Page seeded by OCA on Sun May 4 01:45:08 2008
