Mechanism for the transcriptional repression by c-Myc on PDGF beta-receptor - PubMed (original) (raw)
. 2001 Apr;114(Pt 8):1533-44.
doi: 10.1242/jcs.114.8.1533.
Affiliations
- PMID: 11282029
- DOI: 10.1242/jcs.114.8.1533
Mechanism for the transcriptional repression by c-Myc on PDGF beta-receptor
H Izumi et al. J Cell Sci. 2001 Apr.
Abstract
c-Myc plays a key role in the cell cycle dependent control of the PDGF beta-receptor mRNA. The mouse platelet-derived growth factor (PDGF) beta-receptor promoter contains a CCAAT motif, and NF-Y plays an essential role in its transcription. Coexpression of c-Myc represses PDGF beta-receptor luciferase reporter activity, and the CCAAT motif in the promoter is indispensable for this repression. Here we show that c-Myc binds NF-Y subunits, YB and YC, by immunoprecipitation from cotransfected COS-1 cells. The in vitro-translated c-Myc also binds the glutathione S-transferase (GST)-NF-YB fusion protein and GST-NF-YC, but not GST-NF-YA. The most C-terminal region of HAP domains of NF-YB and NF-YC, and the Myc homology boxes, but not the C-terminal bHLHZip domain, are indispensable for the coimmunoprecipitation, and also for the repression of PDGF beta-receptor. c-Myc binds NF-Y complex without affecting the efficiency of NF-Y binding to DNA. However, the expression of Myc represses the transcriptional activation of NF-YC when fused to the GAL4 DNA binding domain. Furthermore, this repression was seen only when Myc homology boxes are present, and NF-YC contains the c-Myc binding region.
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