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  • Title: The budding yeast HRR25 gene product is a casein kinase I isoform.
    Author: DeMaggio AJ, Lindberg RA, Hunter T, Hoekstra MF.
    Journal: Proc Natl Acad Sci U S A; 1992 Aug 01; 89(15):7008-12. PubMed ID: 1495994.
    Abstract:
    The Saccharomyces cerevisiae HRR25 gene was identified as a regulator of DNA strand-break repair. HRR25 encodes a protein kinase that is closely related to bovine casein kinase I (CKI). CKI is a ubiquitous multipotential protein kinase. Rabbit polyclonal antibodies that recognize and immunoprecipitate Hrr25p have been generated and an immune complex protein kinase assay has been developed. The reaction depends upon HRR25 and shows that Hrr25p uses casein as a substrate. The identity between Hrr25p and bovine CKI suggests that Hrr25p is a yeast isoform of the CKI family and that CKIs may play a role in regulating DNA metabolism.
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