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- W3149286975 abstract "Effector kinase Chk1 is an evolutionarily conserved protein kinase. It is a key mediator linking the mechanisms that monitor DNA integrity to components of the cell cycle engine. In this study, recombinant vectors pEGFP-C1-Chk1/C 288/C 334/C 368 were constructed and transfected into HeLa cells to study the effect of the Chk1 regulatory domain on the regulation of subcellular Chk1 location in response to DNA damage. We found that DNA damage-induced nuclear accumulation is regulated by 34 amino acids (334–368) in the C-terminal regulatory domain. Recombinant vectors pXJ41-Chk1/C 288/C 334/C 368 were co-transfected with reporter plasmid pEGFP-N2 into HeLa cells to study the repair abilities of the different human Chk1 truncation mutants. In addition, recombinant vectors were transfected into HeLa cells to study the effects of the different truncation mutants on the cell cycle. Furthermore, to study the kinase activity of the different truncation mutants, Ser216 phosphorylation of Cdc25C was studied by Western blot analysis. We found that the enzymatic activity of C 368, missing the 108 C-terminal amino acids (368–476), was higher than that of full-length Chk1, and C 368 delayed the cell cycle progression. The enzymatic activity of C 334, missing the 142 C-terminal amino acids (334–476), was equivalent to that of full-length Chk1. C 288, missing the 188 C-terminal amino acids (288–476), had almost no enzymatic activity, suggesting that the regulatory domain contains both inhibitory and regulatory elements. This study provides useful information for further research on Chk1 function." @default.
- W3149286975 created "2021-04-13" @default.
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- W3149286975 date "2011-01-01" @default.
- W3149286975 modified "2023-09-23" @default.
- W3149286975 title "C-terminal domain of Chk1 regulates its subcellular location and kinase activity for DNA repair" @default.
- W3149286975 hasPublicationYear "2011" @default.
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