title: Cyclin D3 interacts with human activating transcription factor 5 and potentiates its transcription activity.
abstract: The Cyclin D3 protein is a member of the D-type cyclins. Besides serving as cell cycle regulators, D-type cyclins have been reported to be able to interact with several transcription factors and modulate their transcriptional activations. Here we report that human activating transcription factor 5 (hATF5) is a new interacting partner of Cyclin D3. The interaction was confirmed by in vivo coimmunoprecipitation and in vitro binding analysis. Neither interaction between Cyclin D1 and hATF5 nor interaction between Cyclin D2 and hATF5 was observed. Confocal microscopy analysis showed that Cyclin D3 could colocalize with hATF5 in the nuclear region. Cyclin D3 could potentiate hATF5 transcriptional activity independently of its Cdk4 partner. But Cyclin D1 and Cyclin D2 had no effect on hATF5 transcriptional activity. These data provide a new clue to understand the new role of Cyclin D3 as a transcriptional regulator.
authors.affiliation: State Key Laboratory of Genetic Engineering and Gene Research Center, Shanghai Medical College of Fudan University, Shanghai 200032, People's Republic of China.
authors.forename: Wenjin
authors.initials: W
authors.lastname: Liu
authors.forename: Maoyun
authors.initials: M
authors.lastname: Sun
authors.forename: Jianhai
authors.initials: J
authors.lastname: Jiang
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Shen
authors.forename: Qing
authors.initials: Q
authors.lastname: Sun
authors.forename: Weicheng
authors.initials: W
authors.lastname: Liu
authors.forename: Hailian
authors.initials: H
authors.lastname: Shen
authors.forename: Jianxin
authors.initials: J
authors.lastname: Gu
mesh_terms: D000818:Animals; D001483:Base Sequence; D019556:COS Cells; D019938:Cyclin D1 / Q000235:genetics / Q000378:metabolism; D056742:Cyclin D2; D056743:Cyclin D3; D051358:Cyclin-Dependent Kinase 4; D018844:Cyclin-Dependent Kinases / Q000235:genetics / Q000378:metabolism; D016213:Cyclins / Q000235:genetics / Q000378:metabolism*; D018076:DNA, Complementary / Q000235:genetics; D006367:HeLa Cells; D006801:Humans; D066298:In Vitro Techniques; D051379:Mice; D018613:Microscopy, Confocal; D041681:NIH 3T3 Cells; D011518:Proto-Oncogene Proteins; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism*; D014158:Transcription, Genetic; D014162:Transfection; D020798:Two-Hybrid System Techniques
chemical_list: C080336:CCND2 protein, human; C534696:CCND3 protein, human; C486196:Ccnd2 protein, mouse; C534697:Ccnd3 protein, mouse; D056742:Cyclin D2; D056743:Cyclin D3; D016213:Cyclins; D018076:DNA, Complementary; D011518:Proto-Oncogene Proteins; D011994:Recombinant Proteins; D014157:Transcription Factors; D019938:Cyclin D1; C495900:CDK4 protein, human; C495902:Cdk4 protein, mouse; D051358:Cyclin-Dependent Kinase 4; D018844:Cyclin-Dependent Kinases