1gcb

Publication Abstract from PubMed

Bleomycin hydrolase is a cysteine protease that hydrolyzes the anticancer drug bleomycin. The homolog in yeast, Gal6, has recently been identified and found to bind DNA and to act as a repressor in the Gal4 regulatory system. The crystal structure of Gal6 at 2.2 A resolution reveals a hexameric structure with a prominent central channel. The papain-like active sites are situated within the central channel, in a manner resembling the organization of active sites in the proteasome. The Gal6 channel is lined with 60 lysine residues from the six subunits, suggesting a role in DNA binding. The carboxyl-terminal arm of Gal6 extends into the active site cleft and may serve a regulatory function. Rather than each residing in distinct, separable domains, the protease and DNA-binding activities appear structurally intertwined in the hexamer, implying a coupling of these two activities.

Crystal structure of a conserved protease that binds DNA: the bleomycin hydrolase, Gal6.,Joshua-Tor L, Xu HE, Johnston SA, Rees DC Science. 1995 Aug 18;269(5226):945-50. PMID:7638617^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.