Abstract:
:CREB binding protein (CBP) plays a central role in cell differentiation and proliferation, interacting with a large number of nuclear factors. To find novel nuclear factors associating with CBP, we have carried out yeast two-hybrid screening of human chondrocyte cDNA library using the C/H3 region of CBP as a bait and cloned CDK4 binding protein p34SEI-1, the recently found cell cycle regulator. The association of p34SEI-1 with CBP was confirmed in vitro by GST pull-down assay and in vivo by coimmunoprecipitation. Results of the immunofluorescence assay also supported the association of p34SEI-1 and CBP. In reporter assay using CRE promoter, p34SEI-1 strongly suppressed CREB-mediated transcription, and this suppression was overcome by excess amount of CBP, but not by CBPDeltaCH3. It is suggested that the association of p34SEI-1 and CBP is not only involved in cell cycle regulation by CBP, but also have some effect on other CBP-dependent transcription.
journal_name
Int J Mol Medjournal_title
International journal of molecular medicineauthors
Hirose T,Fujii R,Nakamura H,Aratani S,Fujita H,Nakazawa M,Nakamura K,Nishioka K,Nakajima Tsubject
Has Abstractpub_date
2003-06-01 00:00:00pages
705-12issue
6eissn
1107-3756issn
1791-244Xjournal_volume
11pub_type
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