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Activation of CHEK1 at resected DNA DSBs

Stable Identifier
Homo sapiens
Locations in the PathwayBrowser

CHEK1 (Chk1) is a checkpoint kinase activated during genotoxic stress. CHEK1 activation at resected DNA double strand breaks (DSBs) involves ATR-mediated phosphorylation of CHEK1 serine residues S317 and S345 in the presence of claspin (CLSPN), TOPBP1, RAD17:RFC complex, RAD9:HUS1:RAD1 complex, TIMELESS:TIPIN complex, RPA complex and RHNO1 (Liu et al. 2000, Zhao and Piwnica-Worms 2001, Kumagai and Dunphy 2003, Sorensen et al. 2004, Wang et al. 2006, Kemp et al. 2010, Cotta-Ramusino et al. 2011, Liu et al. 2012). Following phosphorylation, CHEK1 dissociates from chromatin and phosphorylates target proteins involved in S/G2 checkpoint activation and/or homologous recombination repair (Smits et al. 2006). CLSPN needs to interact with chromatin only transiently in order to facilitate CHEK1 activation (Lee et al. 2005).

Participant Of
Event Information
Go Biological Process
Catalyst Activity
Catalyst Activity
protein serine/threonine kinase activity of ATR:ATRIP:p-RPA:3' overhanging ssDNA-DSBs:p-MRN:p-S1981,Ac-K3016-ATM:KAT5:BRCA1-C complex:EXO1,DNA2:BLM,WRN:p-S990,Ac-K1249-BRIP1:RAD17:RFC:RAD9:HUS1:RAD1:RHNO1:TOPBP1:TIMELESS:TIPIN:p-T916,S945-CLSPN:CHEK1 [nucleoplasm]
Physical Entity
Orthologous Events