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Mol. Cell. Biol., 07 1995, 3479-3486, Vol 15, No. 7
F Liu, F Ventura, J Doody and J Massague
Bone morphogenic proteins (BMPs) are universal regulators of animal
development. We report the identification and cloning of the BMP type II
receptor (BMPR-II), a missing component of this receptor system in
vertebrates. BMPR-II is a transmembrane serine/threonine kinase that binds
BMP-2 and BMP-7 in association with multiple type I receptors, including
BMPR-IA/Brk1, BMPR-IB, and ActR-I, which is also an activin type I
receptor. Cloning of BMPR-II resulted from a strong interaction of its
cytoplasmic domain with diverse transforming growth factor beta family type
I receptor cytoplasmic domains in a yeast two-hybrid system. In mammalian
cells, however, the interaction of BMPR-II is restricted to BMP type I
receptors and is ligand dependent. BMPR-II binds BMP-2 and -7 on its own,
but binding is enhanced by coexpression of type I BMP receptors. BMP-2 and
BMP-7 can induce a transcriptional response when added to cells
coexpressing ActR-I and BMPR-II but not to cells expressing either receptor
alone. The kinase activity of both receptors is essential for signaling.
Thus, despite their ability to bind to type I and II receptors receptors
separately, BMPs appear to require the cooperation of these two receptors
for optimal binding and for signal transduction. The combinatorial nature
of these receptors and their capacity to crosstalk with the activin
receptor system may underlie the multifunctional nature of their ligands.
Copyright © 1995, American Society for Microbiology
Human type II receptor for bone morphogenic proteins (BMPs): extension of the two-kinase receptor model to the BMPs
Cell Biology and Genetics Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
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