title: ATR and ATRIP: partners in checkpoint signaling.
abstract: The checkpoint kinases ATM (ataxia telangiectasia mutated) and ATR (ATM and Rad3 related) transduce genomic stress signals to halt cell cycle progression and promote DNA repair. We report the identification of an ATR-interacting protein (ATRIP) that is phosphorylated by ATR, regulates ATR expression, and is an essential component of the DNA damage checkpoint pathway. ATR and ATRIP both localize to intranuclear foci after DNA damage or inhibition of replication. Deletion of ATR mediated by the Cre recombinase caused the loss of ATR and ATRIP expression, loss of DNA damage checkpoint responses, and cell death. Therefore, ATR is essential for the viability of human somatic cells. Small interfering RNA directed against ATRIP caused the loss of both ATRIP and ATR expression and the loss of checkpoint responses to DNA damage. Thus, ATRIP and ATR are mutually dependent partners in cell cycle checkpoint signaling pathways.
authors.affiliation: Verna and Mars McLean Department of Biochemistry and Molecular Biology, Howard Hughes Medical Institute, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.
authors.forename: D
authors.initials: D
authors.lastname: Cortez
authors.forename: S
authors.initials: S
authors.lastname: Guntuku
authors.forename: J
authors.initials: J
authors.lastname: Qin
authors.forename: S J
authors.initials: SJ
authors.lastname: Elledge
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D000818:Animals; D064007:Ataxia Telangiectasia Mutated Proteins; D002453:Cell Cycle; D018797:Cell Cycle Proteins; D016923:Cell Death; D002460:Cell Line; D002470:Cell Survival; D017124:Conserved Sequence; D004249:DNA Damage; D004268:DNA-Binding Proteins; D005090:Exodeoxyribonucleases; D005091:Exons / Q000235:genetics; D017353:Gene Deletion; D020043:Genes, Essential / Q000235:genetics; D006367:HeLa Cells; D006801:Humans; D019426:Integrases / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation; D011233:Precipitin Tests; D011485:Protein Binding; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000378:metabolism*; D016415:Sequence Alignment; D015398:Signal Transduction; D014764:Viral Proteins / Q000235:genetics / Q000378:metabolism
chemical_list: C521194:ATRIP protein, human; D048868:Adaptor Proteins, Signal Transducing; D018797:Cell Cycle Proteins; D004268:DNA-Binding Proteins; D010750:Phosphoproteins; D014764:Viral Proteins; C576597:ATR protein, human; D064007:Ataxia Telangiectasia Mutated Proteins; D017346:Protein Serine-Threonine Kinases; C045073:Cre recombinase; D019426:Integrases; D005090:Exodeoxyribonucleases; C429526:three prime repair exonuclease 1