Previous Article | Next Article ![]()
Mol. Cell. Biol., 03 1995, 1573-1581, Vol 15, No. 3
J Carcamo, A Zentella and J Massague
T beta R-II (transforming growth factor beta [TGF-beta] type II receptor)
is a transmembrane serine/threonine kinase that acts as the primary
TGF-beta receptor. Ligand binding to T beta R-II leads to the recruitment
and phosphorylation of T beta R-I, a distantly related transmembrane kinase
that acts as a downstream signaling component. T beta R-I phosphorylation
by T beta R-II is shown here to be essential for signaling. A mutant T beta
R-II that binds ligand but lacks signaling activity was identified. This
mutant was identified by screening with a TGF-beta-inducible vector a
series of mink lung epithelial cell clones that have normal TGF-beta
binding activity but have lost antiproliferative and transcriptional
responses to TGF-beta. When transiently cotransfected with T beta R-II, one
of these cell lines, S-21, recovered TGF-beta responsiveness. cDNA cloning
and sequencing of T beta R-II from S-21 cells revealed a point mutation
that changes proline 525 to leucine in kinase subdomain XI. A recombinant
receptor containing this mutation, T beta R-II(P525L), is similar to
wild-type T beta R-II in its abilities to bind ligand, support ligand
binding to T beta R-I, and form a complex with T beta R- I in vivo. T beta
R-II(P525L) has autophosphorylating activity in vitro and in vivo; however,
unlike the wild-type receptor, it fails to phosphorylate an associated T
beta R-I.(ABSTRACT TRUNCATED AT 250 WORDS)
Copyright © 1995, American Society for Microbiology
Disruption of transforming growth factor beta signaling by a mutation that prevents transphosphorylation within the receptor complex
Cell Biology and Genetics Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021.
This article has been cited by other articles:
Copyright © 2009 by the American Society for Microbiology. For an alternate route to Journals.ASM.org, visit: http://intl-journals.asm.org | More Info»