Ataxia telangiectasia mutated (ATM) interacts with p400 ATPase for an efficient DNA damage response

Journal article

EP400 is an ATP-dependent chromatin remodelling enzyme that regulates DNA double-strand break repair and transcription, including cMyc-dependent gene expression. We previously showed that the N-terminal domain of EP400 increases the efficacy of chemotherapeutic drugs against cancer cells. As the EP400 N-terminal-Like (EP400NL) gene resides next to the EP400 gene locus, this prompted us to investigate whether EP400NL plays a similar role in transcriptional regulation to the full-length EP400 protein. We found that EP400NL forms a human NuA4-like chromatin remodelling complex that lacks both the TIP60 histone acetyltransferase and EP400 ATPase. However, this EP400NL complex displays H2A.Z deposition activity on a chromatin template comparable to the human NuA4 complex, suggesting another associated ATPase such as BRG1 or RuvBL1/RuvBL2 catalyses the reaction. We demonstrated that the transcriptional coactivator function of EP400NL is required for serum and IFNγ-induced PD-L1 gene activation. Furthermore, transcriptome analysis indicates that EP400NL contributes to cMyc-responsive mitochondrial biogenesis. Taken together, our studies show that EP400NL plays a role as a transcription coactivator of PD-L1 gene regulation and provides a potential target to modulate cMyc functions in cancer therapy.fals

Authors: Smith, RJ; Savoian, MS; Weber, LE; Park, JH

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer Science and Business Media LLC
• Journal: BMC molecular biology
• Volume: 17
• Issue: 1
• Pages: 22-22
• Publication date: 2016-11-04
• DOI: 10.1186/s12867-016-0075-7
• EISSN: 1471-2199
• ISSN: 1471-2199
• Language: English
• Keywords: Chromatin; Biology; Molecular biology; Genetics; DNA repair; Cell biology; DNA damage; DNA; DNA-PKcs