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Nucleic Acids Research, Vol 26, Issue 15 3536-3541, Copyright © 1998 by Oxford University Press

ARTICLES

Specificity and fidelity of strand joining by Chlorella virus DNA ligase

V Sriskanda and S Shuman
Molecular Biology Program, Sloan-Kettering Institute, New York, NY 10021, USA.

Chlorella virus PBCV-1 DNA ligase seals nicked duplex DNA substrates consisting of a 5'-phosphate-terminated strand and a 3'-hydroxyl- terminated strand annealed to a bridging template strand, but cannot ligate a nicked duplex composed of two DNAs annealed on an RNA template. Whereas PBCV-1 ligase efficiently joins a 3'-OH RNA to a 5'- phosphate DNA, it is unable to join a 3'-OH DNA to a 5'-phosphate RNA. The ligase discriminates at the substrate binding step between nicked duplexes containing 5'-phosphate DNA versus 5'-phosphate RNA strands. PBCV-1 ligase readily seals a nicked duplex DNA containing a single ribonucleotide substitution at the reactive 5'-phosphate end. These results suggest a requirement for a B-form helical conformation of the polynucleotide on the 5'-phosphate side of the nick. Single base mismatches at the nick exert disparate effects on DNA ligation efficiency. PBCV-1 ligase tolerates mismatches involving the 5'- phosphate nucleotide, with the exception of 5'-A:G and 5'-G:A mispairs, which reduce ligase activity by two orders of magnitude. Inhibitory configurations at the 3'-OH nucleotide include 3'-G:A, 3'-G:T, 3'-T:T, 3'-A:G, 3'-G:G, 3'-A:C and 3'-C:C. Our findings indicate that Chlorella virus DNA ligase has the potential to affect genome integrity by embedding ribonucleotides in viral DNA and by sealing nicked molecules with mispaired ends, thereby generating missense mutations.
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