Download MendeleyCrystal structure of a conserved protease that binds DNA: the bleomycin hydrolase, Gal6.
Joshua-Tor, L., Xu, H.E., Johnston, S.A., Rees, D.C.(1995) Science 269: 945-950
- PubMed: 7638617
- DOI: https://doi.org/10.1126/science.7638617
- Primary Citation of Related Structures:
1GCB - PubMed Abstract:
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.
Organizational Affiliation:
Divison of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena 91125, USA.
