tailieunhanh - Báo cáo khoa học: Akt-dependent phosphorylation negatively regulates the transcriptional activity of dHAND by inhibiting the DNA binding activity

Tham khảo luận văn - đề án 'báo cáo khoa học: akt-dependent phosphorylation negatively regulates the transcriptional activity of dhand by inhibiting the dna binding activity', luận văn - báo cáo, báo cáo khoa học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Eur. J. Biochem. 271 3330-3339 2004 FEBS 2004 doi Akt-dependent phosphorylation negatively regulates the transcriptional activity of dHAND by inhibiting the DNA binding activity Masao Murakami1 2 Keiichiro Kataoka1 Shigetomo Fukuhara1 Osamu Nakagawa2 and Hiroki Kurihara1 3 Division of Integrative Cell Biology Department of Embryogenesis Institute of Molecular Embryology and Genetics Kumamoto University Japan 2Department of Molecular Biology The University of Texas Southwestern Medical Center at Dallas TX USA 3Department of Physiological Chemistry and Metabolism The University of Tokyo Graduate School of Medicine Japan HAND2 dHAND is a basic helix-loop-helix transcription factor expressed in the heart and neural crest derivatives during embryogenesis. Although dHAND is essential for branchial arch cardiovascular and limb development its target genes have not been identified. The regulatory mechanisms of dHAND function also remain relatively unknown. Here we report that Akt PKB a serine threonine protein kinase involved in cell survival growth and differentiation phosphorylates dHAND and inhibits dHAND-mediated transcription. AU5-dHAND expressed in 293T cells became phosphorylated possibly at its Akt phosphorylation motif in the absence of kinase inhibitors whereas the phosphatidylinositol 3-kinase inhibitor wort-mannin and the Akt inhibitor NL-71-101 but not the p70 S6 kinase inhibitor rapamycin significantly reduced dHAND phosphorylation. Coexpression of HA-Akt augmented dHAND phosphorylation at multiple serine and threonine residues mainly located in the bHLH domain and as a result decreased the transcriptional activity of dHAND. Consistently alanine mutation mimicking the nonphosphorylation state abolished the inhibitory effect of Akt on dHAND whereas aspartate mutation mimicking the phosphorylation state resulted in a loss of dHAND transcriptional activity. These changes in dHAND transcriptional activity were in parallel with .

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