1lww
From Proteopedia
Borohydride-trapped hOgg1 Intermediate Structure Co-Crystallized with 8-bromoguanine
Overview
Most spontaneous damage to bases in DNA is corrected through the action of the base-excision DNA repair pathway. Base excision repair is initiated by DNA glycosylases, lesion-specific enzymes that intercept aberrant bases in DNA and catalyze their excision. How such proteins accomplish the feat of catalyzing no fewer than five sequential reaction steps using a single active site has been unknown. To help answer this, we report the structure of a trapped catalytic intermediate in DNA repair by human 8-oxoguanine DNA glycosylase. This structure and supporting biochemical results reveal that the enzyme sequesters the excised lesion base and exploits it as a cofactor to participate in catalysis. To our knowledge, the present example represents the first documented case of product-assisted catalysis in an enzyme-catalyzed reaction.
About this Structure
1LWW is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Product-assisted catalysis in base-excision DNA repair., Fromme JC, Bruner SD, Yang W, Karplus M, Verdine GL, Nat Struct Biol. 2003 Mar;10(3):204-11. PMID:12592398 Page seeded by OCA on Sat May 3 00:23:01 2008
