Sökning: onr:"swepub:oai:DiVA.org:uu-10806" >
Chk1 regulates the ...
Chk1 regulates the S phase checkpoint by coupling the physiological turnover and ionizing radiation-induced accelerated proteolysis of Cdc25A.
-
Storgaard Sørensen, Claus (författare)
-
Syljuåsen, Randi G (författare)
-
Falck, Jacob (författare)
-
visa fler...
-
Schroeder, Tine (författare)
-
- Rönnstrand, Lars (författare)
- Ludwiginstitutet för Cancerforskning
-
Khanna, Kum Kum (författare)
-
Zhou, Bin-Bing (författare)
-
Bartek, Jiri (författare)
-
Lukas, Jiri (författare)
-
visa färre...
-
(creator_code:org_t)
- 2003
- 2003
- Engelska.
-
Ingår i: Cancer Cell. - 1535-6108. ; 3:3, s. 247-58
- Relaterad länk:
-
http://www.ncbi.nlm....
-
visa fler...
-
https://urn.kb.se/re...
-
visa färre...
Abstract
Ämnesord
Stäng
- Chk1 kinase coordinates cell cycle progression and preserves genome integrity. Here, we show that chemical or genetic ablation of human Chk1 triggered supraphysiological accumulation of the S phase-promoting Cdc25A phosphatase, prevented ionizing radiation (IR)-induced degradation of Cdc25A, and caused radioresistant DNA synthesis (RDS). The basal turnover of Cdc25A operating in unperturbed S phase required Chk1-dependent phosphorylation of serines 123, 178, 278, and 292. IR-induced acceleration of Cdc25A proteolysis correlated with increased phosphate incorporation into these residues generated by a combined action of Chk1 and Chk2 kinases. Finally, phosphorylation of Chk1 by ATM was required to fully accelerate the IR-induced degradation of Cdc25A. Our results provide evidence that the mammalian S phase checkpoint functions via amplification of physiologically operating, Chk1-dependent mechanisms.
Nyckelord
- Cell Cycle/*physiology/radiation effects
- Cell Cycle Proteins
- DNA Replication/radiation effects
- DNA-Binding Proteins
- Enzyme Activation
- Hela Cells
- Humans
- Kinetics
- Models; Biological
- Phosphorylation
- Protein Kinases/*metabolism
- Protein-Serine-Threonine Kinases/physiology
- Radiation; Ionizing
- S Phase/radiation effects
- Serine/metabolism
- Signal Transduction
- Tumor Cells; Cultured
- Tumor Suppressor Proteins
- cdc25 Phosphatase/*physiology/radiation effects
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas