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Repair of DNA strand gaps and nicks containing 3'-phosphate and 5'-hydroxyl termini by purified mammalian enzymes.

Abstract：

:A putative role for mammalian polynucleotide kinases that possess both 5'-phosphotransferase and 3'-phosphatase activity is the restoration of DNA strand breaks with 5'-hydroxyl termini or 3'-phosphate termini, or both, to a form that supports the subsequent action of DNA repair polymerases and DNA ligases, i.e. 5'-phosphate and 3'-hydroxyl termini. To further assess this possibility, we compared the activity of the 3'-phosphatase of purified calf thymus polynucleotide kinase towards a variety of substrates. The rate of removal of 3'-phosphate groups from nicked or short (1 nt) gapped sites in double-stranded DNA was observed to be similar to that of 3'-phosphate groups from single-stranded substrates. Thus this activity of polynucleotide kinase does not appear to be influenced by steric accessibility of the phosphate group. We subsequently demonstrated that the concerted reactions of polynucleotide kinase and purified human DNA ligase I could efficiently repair DNA nicks possessing 3'-phosphate and 5'-hydroxyl termini, and similarly the combination of these two enzymes together with purified rat DNA polymerase beta could seal a strand break with a 1 nt gap. With a substrate containing a nick bounded by 3'- and 5'-OH termini, the rate of gap filling by polymerase beta was significantly enhanced in the presence of polynucleotide kinase and ATP, indicating the positive influence of 5'-phosphorylation. The reaction was further enhanced by addition of DNA ligase I to the reaction mixture. This is due, at least in part, to an enhancement by DNA ligase I of the rate of 5'-phosphorylation catalyzed by polynucleotide kinase.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Karimi-Busheri F,Lee J,Tomkinson AE,Weinfeld M

doi

10.1093/nar/26.19.4395

subject

Has Abstract

pub_date

1998-10-01 00:00:00

pages

4395-400

issue

19

eissn

0305-1048

issn

1362-4962

pii

gkb722

journal_volume

26

pub_type

杂志文章

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