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A phospho-proteomic screen identifies substrates of the checkpoint kinase Chk1.

Abstract：

BACKGROUND:The cell-cycle checkpoint kinase Chk1 is essential in mammalian cells due to its roles in controlling processes such as DNA replication, mitosis and DNA-damage responses. Despite its paramount importance, how Chk1 controls these functions remains unclear, mainly because very few Chk1 substrates have hitherto been identified. RESULTS:Here, we combine a chemical genetics approach with high-resolution mass spectrometry to identify novel Chk1 substrates and their phosphorylation sites. The list of targets produced reveals the potential impact of Chk1 function not only on processes where Chk1 was already known to be involved, but also on other key cellular events such as transcription, RNA splicing and cell fate determination. In addition, we validate and explore the phosphorylation of transcriptional co-repressor KAP1 Ser473 as a novel DNA-damage-induced Chk1 site. CONCLUSIONS:By providing a substantial set of potential Chk1 substrates, we present opportunities for studying unanticipated functions for Chk1 in controlling a wide range of cellular processes. We also refine the Chk1 consensus sequence, facilitating the future prediction of Chk1 target sites. In addition, our identification of KAP1 Ser473 phosphorylation as a robust readout for Chk1 activity could be used to explore the in vivo effects of Chk1 inhibitors that are being developed for clinical evaluation.

journal_name

Genome Biol

journal_title

Genome biology

authors

Blasius M,Forment JV,Thakkar N,Wagner SA,Choudhary C,Jackson SP

doi

10.1186/gb-2011-12-8-r78

subject

Has Abstract

pub_date

2011-08-18 00:00:00

pages

R78

issue

8

eissn

1474-7596

issn

1474-760X

pii

gb-2011-12-8-r78

journal_volume

12

pub_type

杂志文章

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