SNAP annotations: PDB entry 1hu0

PDB-id

1hu0; DSSR-derived features in text and JSON formats; DNAproDB

Class

hydrolase-DNA

Method

X-ray (2.35 Å)

Summary

Crystal structure of an hogg1-DNA borohydride trapped intermediate complex

Reference

Fromme JC, Bruner SD, Yang W, Karplus M, Verdine GL (2003): "Product-Assisted Catalysis in base-excision DNA Repair." Nat.Struct.Biol., 10, 204-211. doi: 10.1038/nsb902.

Abstract

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.