| http://purl.uniprot.org/citations/30763888 | http://www.w3.org/1999/02/22-rdf-syntax-ns#type | http://purl.uniprot.org/core/Journal_Citation |
| http://purl.uniprot.org/citations/30763888 | http://www.w3.org/2000/01/rdf-schema#comment | "There exist two major base excision DNA repair (BER) pathways, namely single-nucleotide or "short-patch" (SP-BER), and "long-patch" BER (LP-BER). Both pathways appear to be involved in the repair of small base lesions such as uracil, abasic sites and oxidized bases. In addition to DNA polymerase β (Polβ) as the main BER enzyme for repair synthesis, there is evidence for a minor role for DNA polymerase lambda (Polλ) in BER. In this study we explore the potential contribution of Polλ to both SP- and LP-BER in cell-free extracts. We measured BER activity in extracts of mouse embryonic fibroblasts using substrates with either a single uracil or the chemically stable abasic site analog tetrahydrofuran residue. The addition of purified Polλ complemented the pronounced BER deficiency of POLB-null cell extracts as efficiently as did Polβ itself. We have developed a new approach for determining the relative contributions of SP- and LP-BER pathways, exploiting mass-labeled nucleotides to distinguish single- and multinucleotide repair patches. Using this method, we found that uracil repair in wild-type and in Polβ-deficient cell extracts supplemented with Polλ was ∼80% SP-BER. The results show that recombinant Polλ can contribute to both SP- and LP-BER. However, endogenous Polλ, which is present at a level ˜50% that of Polβ in mouse embryonic fibroblasts, appears to make little contribution to BER in extracts. Thus Polλ in cells appears to be under some constraint, perhaps sequestered in a complex with other proteins, or post-translationally modified in a way that limits its ability to participate effectively in BER."xsd:string |
| http://purl.uniprot.org/citations/30763888 | http://purl.org/dc/terms/identifier | "doi:10.1016/j.dnarep.2019.02.001"xsd:string |
| http://purl.uniprot.org/citations/30763888 | http://purl.uniprot.org/core/author | "Demple B."xsd:string |
| http://purl.uniprot.org/citations/30763888 | http://purl.uniprot.org/core/author | "Thapar U."xsd:string |
| http://purl.uniprot.org/citations/30763888 | http://purl.uniprot.org/core/date | "2019"xsd:gYear |
| http://purl.uniprot.org/citations/30763888 | http://purl.uniprot.org/core/name | "DNA Repair (Amst)"xsd:string |
| http://purl.uniprot.org/citations/30763888 | http://purl.uniprot.org/core/pages | "11-19"xsd:string |
| http://purl.uniprot.org/citations/30763888 | http://purl.uniprot.org/core/title | "Deployment of DNA polymerases beta and lambda in single-nucleotide and multinucleotide pathways of mammalian base excision DNA repair."xsd:string |
| http://purl.uniprot.org/citations/30763888 | http://purl.uniprot.org/core/volume | "76"xsd:string |
| http://purl.uniprot.org/citations/30763888 | http://www.w3.org/2004/02/skos/core#exactMatch | http://purl.uniprot.org/pubmed/30763888 |
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