Biochem J. 2001 Jun 15;356(Pt 3):829-34.

Interaction of human thymidine kinase 1 with p21(Waf1).

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Institute of Biochemistry, National Taiwan University, College of Medicine, No. 1 Section 1 Jen-Ai Road, Taipei, Taiwan, Republic of China.

Abstract

The overexpression of the cyclin-dependent kinase (CDK) inhibitor p21(Waf1) can inhibit cell proliferation, which is mediated by direct binding to CDK and proliferating-cell nuclear antigen. In this study, we demonstrated that human cytosolic thymidine kinase 1 (TK1) polypeptide can form a complex with p21(Waf1). The C-terminal domain of p21(Waf1) appeared to interact with the TK1 polypeptide, but, despite the inhibitory function of p21(Waf1), their association did not alter TK1 functional activity. However, overexpression of TK1 overcame p21(Waf1)-mediated growth suppression and blocked the association of CDK2 with p21(Waf1), suggesting that TK1 interferes with the inhibitory function of p21(Waf1). Based on these results, we here propose that the molecular function of p21(Waf1) in cells can be perturbed through its interaction with another cellular protein, TK1.

PMID:: 11389691; [PubMed - indexed for MEDLINE]
PMCID:: PMC1221910

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Cited by 2 PubMed Central articles

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Ke PY, Chang ZF. Mol Cell Biol. 2004 Jan; 24(2):514-26.

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Interaction of human thymidine kinase 1 with p21(Waf1).
Interaction of human thymidine kinase 1 with p21(Waf1).
Biochem J. 2001 Jun 15 ;356(Pt 3):829-34.

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