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- W2064592510 abstract "The Bloom (BLM) and Werner's (WRN) syndrome proteins may regulate recombination and DNA repair. Using a novel polyclonal antibody to human BLM, we detected the 170-kda BLM antigen in wild-type but not Bloom syndrome cells. BLM was localized to punctate nuclear structures. The level of BLM but not WRN was 3.6 fold-higher in G(1)/S-synchronized fibroblasts than in G(0)-synchronized fibroblasts. BLM-positive cells invariably expressed topoisomerase IIalpha, whereas topoisomerase IIbeta was expressed constitutively. Transfections of BLM deletion mutants demonstrated that the C-terminal domain of BLM mediated nuclear entry and the central helicase domain was necessary for producing the punctate pattern. By subcellular fractionation, BLM was found primarily in high-salt extracts of the nucleoplasm and the nuclear matrix and was enriched in G(1)/S-synchronized cells compared with G(0)-synchronized cells. There was no interaction between BLM and WRN or topoisomerases IIalpha and IIbeta in fibroblasts. These results demonstrate that BLM is targeted to specific nuclear structures and that its expression is enhanced during cell growth. The known nucleolar localization of WRN, its invariant expression during the cell cycle, and the lack of interaction between BLM and WRN suggest distinct roles for BLM and WRN in processes such as DNA repair and recombination." @default.
- W2064592510 created "2016-06-24" @default.
- W2064592510 creator A5038334592 @default.
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- W2064592510 date "1999-12-01" @default.
- W2064592510 modified "2023-10-18" @default.
- W2064592510 title "Localization of the bloom syndrome helicase to punctate nuclear structures and the nuclear matrix and regulation during the cell cycle: Comparison with the werner's syndrome helicase" @default.
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- W2064592510 doi "https://doi.org/10.1002/(sici)1098-2744(199912)26:4<261::aid-mc5>3.0.co;2-a" @default.
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