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Individual Src-family tyrosine kinases direct the degradation or protection of the clock protein Timeless via differential ubiquitylation.

Abstract：

:Timeless was originally identified in Drosophila as an essential component of circadian cycle regulation, where its function is tightly controlled at the protein level by tyrosine phosphorylation and subsequent degradation. In mammals, Timeless has also been implicated in circadian rhythms as well as cell cycle control and embryonic development. Here we report that mammalian Timeless is an SH3 domain-binding protein and substrate for several members of the Src protein-tyrosine kinase family, including Fyn, Hck, c-Src and c-Yes. Co-expression of Tim with Fyn or Hck was followed by ubiquitylation and subsequent degradation in human 293T cells. While c-Src and c-Yes also promoted Tim ubiquitylation, in this case ubiquitylation correlated with Tim protein accumulation rather than degradation. Both c-Src and c-Yes selectively promoted modification of Tim through Lys63-linked polyubiquitin, which may explain the differential effects on Tim protein turnover. These data show distinct and opposing roles for individual Src-family members in the regulation of Tim protein levels, suggesting a unique mechanism for the regulation of Tim function in mammals.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

O'Reilly LP,Zhang X,Smithgall TE

doi

10.1016/j.cellsig.2012.12.009

subject

Has Abstract

pub_date

2013-04-01 00:00:00

pages

860-6

issue

4

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(12)00346-4

journal_volume

25

pub_type

杂志文章

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