PMID: 9539976Apr 16, 1998Paper

Structure and function of mammalian DNA ligases

Mutation Research
Alan E Tomkinson, Z B Mackey

Abstract

DNA joining events are required for the completion of DNA replication, DNA excision repair and genetic recombination. Five DNA ligase activities, I-V, have been purified from mammalian cell extracts and three mammalian LIG genes, LIG1 LIG3 and LIG4, have been cloned. During DNA replication, the joining of Okazaki fragments by the LIG1 gene product appears to be mediated by an interaction with proliferating cell nuclear antigen (PCNA). This interaction may also occur during the completion of mismatch, nucleotide excision and base excision repair (BER). In addition, DNA ligase I participates in a second BER pathway that is carried out by a multiprotein complex in which DNA ligase I interacts directly with DNA polymerase beta. DNA ligase III alpha and DNA ligase III beta, which are generated by alternative splicing of the LIG3 gene, can be distinguished by their ability to bind to the DNA repair protein, XRCC1. The interaction between DNA ligase III alpha and XRCC1, which occurs through BRCT motifs in the C-termini of these polypeptides, implicates this isoform of DNA ligase III in the repair of DNA single-strand breaks and BER. DNA ligase II appears to be a proteolytic fragment of DNA ligase III alpha. The restricted expression o...Continue Reading

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