PMID: 9538156May 9, 1998Paper

Differential transcriptional activation by the N-terminal region of BRCA1 splice variants BRCA1a and BRCA1b

Oncology Reports
J Q CuiV N Rao

Abstract

The breast and ovarian cancer susceptibility gene BRCA1, is a nuclear phosphoprotein which functions as a tumor suppressor in human breast cancer cells. BRCA1 protein contains an amino-terminal zinc finger motif and a carboxy-terminal acidic region. Recently, the carboxy-terminal region of BRCA1 and the amino-terminal region of BRCA2 proteins were shown to function as transactivation domains when fused to GAL4 DNA binding domain. We have recently isolated and characterized two new naturally occurring variants of BRCA1 (BRCA1a/p110 and BRCA1b/p100) which are phosphoproteins containing phosphotyrosine that associate with E2F transcriptional factors, cyclins and cyclin dependent kinases indicating a role for BRCA1 proteins in cell-cycle regulation. Here we show for the first time that the amino-terminal region of BRCA1a (BNT) but not BRCA1b can also function as a transcriptional activator when fused to GAL4 DNA binding domain. Thus, BRCA1/1a proteins contain two autonomous transcriptional activation domains, one at the amino-terminal region (BNT) and the other at the carboxy-terminal region (BCT). BRCA1b retains only the BCT domain since it has lost part of the potential BNT domain as a result of alternative splicing. Our results ...Continue Reading

Citations

Sep 7, 2011·Biochemical and Biophysical Research Communications·Naoko OkumuraSatoru Matsuda
May 28, 2003·Biochemical and Biophysical Research Communications·Jiyun KimJoonho Choe
Apr 12, 2002·Endocrine Reviews·Cynthia A Heinlein, Chawnshang Chang

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