Analysis of the DNA joining repertoire of Chlorella virus DNA ligase and a new crystal structure of the ligase-adenylate intermediate.

ABSTRACT: Chlorella virus DNA ligase is the smallest eukaryotic ATP-dependent DNA ligase known; it suffices for yeast cell growth in lieu of the essential yeast DNA ligase Cdc9. The Chlorella virus ligase-adenylate intermediate has an intrinsic nick sensing function and its DNA footprint extends 8-9 nt on the 3'-hydroxyl (3'-OH) side of the nick and 11-12 nt on the 5'-phosphate (5'-PO4) side. Here we establish the minimal length requirements for ligatable 3'-OH and 5'-PO4 strands at the nick (6 nt) and describe a new crystal structure of the ligase-adenylate in a state construed to reflect the configuration of the active site prior to nick recognition. Comparison with a previous structure of the ligase-adenylate bound to sulfate (a mimetic of the nick 5'-PO4) suggests how the positions and contacts

SUBMITTER: Odell M 

PROVIDER: S-EPMC212790 | biostudies-literature | 2003 Sep

REPOSITORIES: biostudies-literature