3we3 | pdb_00003we3
Structure of BLM RQC domain bound to an arsenate ion
Structural highlights
Disease[BLM_HUMAN] Bloom syndrome. The disease is caused by mutations affecting the gene represented in this entry. Function[BLM_HUMAN] Participates in DNA replication and repair. Exhibits a magnesium-dependent ATP-dependent DNA-helicase activity that unwinds single- and double-stranded DNA in a 3'-5' direction. Involved in 5'-end resection of DNA during double-strand break (DSB) repair: unwinds DNA and recruits DNA2 which mediates the cleavage of 5'-ssDNA. Negatively regulates sister chromatid exchange (SCE).[1] [2] [3] [4] Publication Abstract from PubMedBloom syndrome is a rare genetic disorder characterized by genomic instability and cancer predisposition. The disease is caused by mutations of the Bloom syndrome protein (BLM). Here we report the crystal structure of a RecQ C-terminal (RQC) domain from human BLM. The structure reveals three novel features of BLM RQC which distinguish it from the previous structures of the Werner syndrome protein (WRN) and RECQ1. First, BLM RQC lacks an aromatic residue at the tip of the beta-wing, a key element of the RecQ-family helicases used for DNA-strand separation. Second, a BLM-specific insertion between the N-terminal helices exhibits a looping-out structure that extends at right angles to the beta-wing. Deletion mutagenesis of this insertion interfered with binding to Holliday junction. Third, the C-terminal region of BLM RQC adopts an extended structure running along the domain surface, which may facilitate the spatial positioning of an HRDC domain in the full-length protein. Structure of the RecQ C-terminal Domain of Human Bloom Syndrome Protein.,Kim SY, Hakoshima T, Kitano K Sci Rep. 2013 Nov 21;3:3294. doi: 10.1038/srep03294. PMID:24257077[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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