BRCA1-associated protein (BRAP)

BRCA1-associated protein (BRAP) is a cytoplasmic RING-type E3 ubiquitin ligase identified for its ability to bind the nuclear localization signal of BRCA1 and other proteins. BRAP regulates nuclear targeting by retaining proteins bearing nuclear localization signals in the cytoplasm, thus modulating their nuclear transport and function. It plays a critical role in signal transduction pathways such as MAPK cascades by restricting Raf/MEK complex formation, mainly through KSR1 scaffold inactivation. Upon Ras activation, BRAP undergoes auto-polyubiquitination, relieving its inhibitory effect on MAPK signaling. The dysregulation or mutation of BRAP is implicated in the pathogenesis of several cancers and may also affect cell proliferation and migration via TGF-beta/PI3K/AKT/mTOR signaling pathways. Although it is considered a potential therapeutic target due to its signaling roles, there are currently no known drugs directly targeting BRAP.

Other names

IMPBRAP2RNF52RING finger protein 52RING-type E3 ubiquitin transferase BRAP2impedes mitogenic signal propagationrenal carcinoma antigen NY-REN-63galectin-2-binding protein

Drugs theoretically targeting BRAP would modulate its ubiquitin ligase activity, disrupt its scaffold inhibition (affecting MAPK signaling), or impact its ability to retain proteins in the cytoplasm. (No approved agents; mechanistic inference based on protein function.)