Volume 19, No 7, Jul 2009

ISSN: 1001-0602 
EISSN: 1748-7838 2018 
impact factor 17.848* 
(Clarivate Analytics, 2019)

Volume 19 Issue 7, July 2009: 849-863

ORIGINAL ARTICLES

Ten1p promotes the telomeric DNA-binding activity of Cdc13p: implication for its function in telomere length regulation

Wei Qian^1,2, Jianyong Wang¹, Na-Na Jin², Xiao-Hong Fu¹, Yi-Chien Lin³, Jing-Jer Lin³ and Jin-Qiu Zhou¹

¹The State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, The Graduate School of Chinese Academy of Sciences, Shanghai 200031, China


²Department of Biochemistry, School of Medicine, Nantong University, Nantong, Jiangsu 226001, China


³Institute for Biopharmaceutical Science, National Yang-Ming University, Shih-Pai, 112, Taipei, Taiwan Correspondence: Jin-Qiu Zhou,(jqzhou@sibs.ac.cn)

In Saccharomyces cerevisiae, the essential gene CDC13 encodes a telomeric single-stranded DNA-binding protein that interacts with Stn1p and Ten1p genetically and physically, and is required for telomere end protection and telomere length control. The molecular mechanism by which Ten1 participates in telomere length regulation and chromosome end protection remains elusive. In this work, we observed a weak interaction of Cdc13p and Ten1p in a gel-filtration analysis using purified recombinant Cdc13p and Ten1p. Ten1p itself exhibits a weak DNA-binding activity, but enhances the telomeric TG_1–3 DNA-binding ability of Cdc13p. Cdc13p is co-immunoprecipitated with Ten1p. In the mutant ten1-55 or ten1-66 cells, the impaired interaction between Ten1p and Cdc13p results in much longer telomeres, as well as a decreased association of Cdc13p with telomeric DNA. Consistently, the Ten1-55 and Ten1-66 mutant proteins fail to stimulate the telomeric DNA-binding activity of Cdc13p in vitro. These results suggest that Ten1p enhances the telomeric DNA-binding activity of Cdc13p to negatively regulate telomere length.

Cell Research (2009) 19:849-863. doi: 10.1038/cr.2009.67; published online 16 June 2009

FULL TEXT | PDF

Browse 1717