title: RASSF6; the Putative Tumor Suppressor of the RASSF Family.
abstract: Humans have 10 genes that belong to the Ras association (RA) domain family (RASSF). Among them, RASSF7 to RASSF10 have the RA domain in the N-terminal region and are called the N-RASSF proteins. In contradistinction to them, RASSF1 to RASSF6 are referred to as the C-RASSF proteins. The C-RASSF proteins have the RA domain in the middle region and the Salvador/RASSF/Hippo domain in the C-terminal region. RASSF6 additionally harbors the PSD-95/Discs large/ZO-1 (PDZ)-binding motif. Expression of RASSF6 is epigenetically suppressed in human cancers and is generally regarded as a tumor suppressor. RASSF6 induces caspase-dependent and -independent apoptosis. RASSF6 interacts with mammalian Ste20-like kinases (homologs of Drosophila Hippo) and cross-talks with the Hippo pathway. RASSF6 binds MDM2 and regulates p53 expression. The interactions with Ras and Modulator of apoptosis 1 (MOAP1) are also suggested by heterologous protein-protein interaction experiments. RASSF6 regulates apoptosis and cell cycle through these protein-protein interactions, and is implicated in the NF-κB and JNK signaling pathways. We summarize our current knowledge about RASSF6 and discuss what common and different properties RASSF6 and the other C-RASSF proteins have.
authors.affiliation: Department of Medical Biochemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8510, Japan. hiwammch@tmd.ac.jp.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Iwasa
authors.affiliation: Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo 113-8510, Japan. jiangxinliang.mbc@tmd.ac.jp.
authors.forename: Xinliang
authors.initials: X
authors.lastname: Jiang
authors.affiliation: Department of Medical Biochemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo 113-8510, Japan. yuhammch@tmd.ac.jp.|Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo 113-8510, Japan. yuhammch@tmd.ac.jp.
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Hata
keywords: Hippo pathway; MDM2; Ras; apoptosis; cell cycle; p53; tumor suppressor