BCCIP functions through p53 to regulate the expression of p21Waf1/Cip1.
The BCCIP protein is a BRCA2 and CDKN1A (p21(Waf1/Cip1)) Interacting Protein, which binds to a highly conserved domain of BRCA2, and a C-terminal domain of the CDK-inhibitor p21. We have previously reported that overexpression of BCCIP increases p21 mRNA and protein levels, and inhibits G(1) to S progression. In this report, we show that a partial shutdown of BCCIP expression by RNA interference reduces p21 levels and impairs G(1)/S checkpoint activation in response to ionizing radiation in HT1080 cells. We further show that the regulation of p21 expression by BCCIP is dependent on p53, and BCCIP regulates p53 transcription activity. These data provide a new mechanism by which BCCIP regulates p21 functions.
Meng
Xiangbing
X
University of New Mexico School of Medicine, Department of Molecular Genetics and Microbiology, Albuquerque, New Mexico 87131-000, USA.
Lu
Huimei
H
Shen
Zhiyuan
Z
D001483:Base Sequence; D002135:Calcium-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000235:genetics / Q000378:metabolism*; D016193:G1 Phase / Q000528:radiation effects; D006801:Humans; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D034622:RNA Interference; D012333:RNA, Messenger / Q000378:metabolism; D011839:Radiation, Ionizing; D016196:S Phase / Q000528:radiation effects; D014158:Transcription, Genetic; D014162:Transfection; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism*
C415366:BCCIP protein, human; C493956:CDKN1A protein, human; D002135:Calcium-Binding Proteins; D018797:Cell Cycle Proteins; D050759:Cyclin-Dependent Kinase Inhibitor p21; D009687:Nuclear Proteins; D012333:RNA, Messenger; D016159:Tumor Suppressor Protein p53