1dd9

Publication Abstract from PubMed

All cellular organisms use specialized RNA polymerases called "primases" to synthesize RNA primers for the initiation of DNA replication. The high-resolution crystal structure of a primase, comprising the catalytic core of the Escherichia coli DnaG protein, was determined. The core structure contains an active-site architecture that is unrelated to other DNA or RNA polymerase palm folds, but is instead related to the "toprim" fold. On the basis of the structure, it is likely that DnaG binds nucleic acid in a groove clustered with invariant residues and that DnaG is positioned within the replisome to accept single-stranded DNA directly from the replicative helicase.

Structure of the RNA polymerase domain of E. coli primase.,Keck JL, Roche DD, Lynch AS, Berger JM Science. 2000 Mar 31;287(5462):2482-6. PMID:10741967^[1]

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