Interaction and Functional Cooperation of PEBP2/CBF with Smads

作者：Jun-ichi Hanai, Lin Feng Chen, Tomohiko Kanno, Naoko Ohtani‐Fujita, Woo Young Kim, Wei-Hui Guo, Takeshi Imamura, Yasuhiro Ishidou, Minoru Fukuchi, Meng-Jiao Shi, Janet Stavnezer, Masahiro Kawabata, Kohei Miyazono, Yoshiaki Ito · 发表于：Journal of Biological Chemistry · 年份：1999 · DOI：10.1074/jbc.274.44.31577 · 被引用次数：451 · 研究领域：Cancer-related gene regulation、Connective tissue disorders research、Bone health and treatments

Smads are signal transducers for members of the transforming growth factor-beta (TGF-beta) superfamily. Upon ligand stimulation, receptor-regulated Smads (R-Smads) are phosphorylated by serine/threonine kinase receptors, form complexes with common-partner Smad, and translocate into the nucleus, where they regulate the transcription of target genes together with other transcription factors. Polyomavirus enhancer binding protein 2/core binding factor (PEBP2/CBF) is a transcription factor complex composed of alpha and beta subunits. The alpha subunits of PEBP2/CBF, which contain the highly conserved Runt domain, play essential roles in hematopoiesis and osteogenesis. Here we show that three mammalian alpha subunits of PEBP2/CBF form complexes with R-Smads that act in TGF-beta/activin pathways as well as those acting in bone morphogenetic protein (BMP) pathways. Among them, PEBP2alphaC/CBFA3/AML2 forms a complex with Smad3 and stimulates transcription of the germline Ig Calpha promoter in a cooperative manner, for which binding of both factors to their specific binding sites is essential. PEBP2 may thus be a nuclear target of TGF-beta/BMP signaling.