期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 97, 期 25, 页码 13749-13754出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.250475697
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资金
- NIGMS NIH HHS [GM24110, T32 GM007092, R01 GM052319, R01 GM024110, GM52319, 5 T32 GM07092-26] Funding Source: Medline
The Saccharomyces cerevisiae proteins Tel1p and Mec1p are involved in telomere length regulation and cellular responses to DNA damage. The closest relative of these proteins is the human Ataxia Telangiectasia Mutated (ATM) protein, a wortmannin-sensitive protein kinase that primarily phosphorylates serines in an SQ motif. We constructed yeast strains containing functional epitopetagged Versions of Tel1p and Mec1p. We showed that immunoprecipitated Te[lp and Mec1p were capable of in vitro phosphorylation of the mammalian protein PHAS-1 (Phosphorylated Heat and Acid Stable protein). These activities are sensitive to wortmannin. Tel1p phosphorylates serine in an SQ motif in PHAS-1. Mutations in the kinase domains of Tel1p and Mec1p result in loss of in vitro kinase activity and the in vivo phenotypes associated with the null tell and mec1 mutations.
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