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. 1997 Jul 1;16(13):3912–3923. doi: 10.1093/emboj/16.13.3912

A kinase subdomain of transforming growth factor-beta (TGF-beta) type I receptor determines the TGF-beta intracellular signaling specificity.

X H Feng 1, R Derynck 1
PMCID: PMC1170015  PMID: 9233801

Abstract

Transforming growth factor-beta (TGF-beta) signals through a heteromeric complex of related type I and type II serine/threonine kinase receptors. In Mv1Lu cells the type I receptor TbetaRI mediates TGF-beta-induced gene expression and growth inhibition, while the closely related type I receptors Tsk7L and TSR1 are inactive in these responses. Using chimeras between TbetaRI and Tsk7L or TSR1, we have defined the structural requirements for TGF-beta signaling by TbetaRI. The extracellular/transmembrane or cytoplasmic domains of TbetaRI and Tsk7L were functionally not equivalent. The juxtamembrane domain, including the GS motif, and most regions in the kinase domain can functionally substitute for each other, but the alphaC-beta4-beta5 region from kinase subdomains III to V conferred a distinct signaling ability. Replacement of this sequence in TbetaRI by the corresponding domain of Tsk7L inactivated TGF-beta signaling, whereas its introduction into Tsk7L conferred TGF-beta signaling. The differential signaling associated with this region was narrowed down to a sequence of eight amino acids, the L45 loop, which is exposed in the three-dimensional kinase structure and diverges highly between TbetaRI and Tsk7L or TSR1. Replacement of the L45 sequence in Tsk7L with that of TbetaRI conferred TGF-beta responsiveness to the Tsk7L cytoplasmic domain in Mv1Lu cells. Thus, the L45 sequence between kinase subdomains IV and V specifies TGF-beta responsiveness of the type I receptor.

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Selected References

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