COBRA1 inhibits AP-1 transcriptional activity in transfected cells.

Abstract:

:Mutations in the breast cancer susceptibility gene (BRCA1) account for a significant proportion of hereditary breast and ovarian cancers. Cofactor of BRCA1 (COBRA1) was isolated as a BRCA1-interacting protein and exhibited a similar chromatin reorganizing activity to that of BRCA1. However, the biological role of COBRA1 remains largely unexplored. Here, we report that ectopic expression of COBRA1 inhibited activator protein 1 (AP-1) transcriptional activity in transfected cells in a dose-dependent manner, whereas reduction of endogenous COBRA1 with a small interfering RNA significantly enhanced AP-1-mediated transcriptional activation. COBRA1 physically interacted with the AP-1 family members, c-Jun and c-Fos, and the middle region of COBRA1 bound to c-Fos. Lack of c-Fos binding site in the COBRA1 completely abolished the COBRA1 inhibition of AP-1 trans-activation. These findings suggest that COBRA1 may directly modulate AP-1 pathway and, therefore, may play important roles in cell proliferation, differentiation, apoptosis, and oncogenesis.

authors

Zhong H,Zhu J,Zhang H,Ding L,Sun Y,Huang C,Ye Q

doi

10.1016/j.bbrc.2004.10.079

subject

Has Abstract

pub_date

2004-12-10 00:00:00

pages

568-73

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(04)02397-6

journal_volume

325

pub_type

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