Vance, Keith W., Shaw, Heather M., Rodriguez, Mercedes, Ott, Sascha and Goding, Colin R. (2010) The retinoblastoma protein modulates Tbx2 functional specificity. Molecular Biology of the Cell, Vol.21 (No.15). pp. 2770-2779. doi:10.1091/mbc.E09-12-1029

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Abstract

Tbx2 is a member of a large family of transcription factors defined by homology to the T-box DNA-binding domain. Tbx2 plays a key role in embryonic development, and in cancer through its capacity to suppress senescence and promote invasiveness. Despite its importance, little is known of how Tbx2 is regulated or how it achieves target gene specificity. Here we show that Tbx2 specifically associates with active hypophosphorylated retinoblastoma protein (Rb1), a known regulator of many transcription factors involved in cell cycle progression and cellular differentiation, but not with the Rb1-related proteins p107 or p130. The interaction with Rb1 maps to a domain immediately carboxy-terminal to the T-box and enhances Tbx2 DNA binding and transcriptional repression. Microarray analysis of melanoma cells expressing inducible dominant-negative Tbx2, comprising the T-box and either an intact or mutated Rb1 interaction domain, shows that Tbx2 regulates the expression of many genes involved in cell cycle control and that a mutation which disrupts the Rb1-Tbx2 interaction also affects Tbx2 target gene selectivity. Taken together, the data show that Rb1 is an important determinant of Tbx2 functional specificity.

Item Type:	Journal Article
Subjects:	Q Science > QP Physiology
Divisions:	Faculty of Science > Life Sciences (2010- ) > Biological Sciences ( -2010) Faculty of Science > Centre for Systems Biology
Library of Congress Subject Headings (LCSH):	Transcription factors, Retinoblastoma, Gene expression
Journal or Publication Title:	Molecular Biology of the Cell
Publisher:	American Society for Cell Biology
ISSN:	1059-1524
Official Date:	1 August 2010
Dates:	Date Event 1 August 2010 Published
Volume:	Vol.21
Number:	No.15
Number of Pages:	10
Page Range:	pp. 2770-2779
DOI:	10.1091/mbc.E09-12-1029
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	Medical Research Council (Great Britain) (MRC), University of Warwick, Wellcome Trust (London, England)

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