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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Activin receptors: cellular signalling by receptor serine kinases.

Activins are dimeric growth and differentiation factors which signal through a heteromeric complex of receptor serine kinases. Affinity labelling of activin-responsive cells with 125I-labelled activin A reveals activin-binding species of approximately 50 and 75 kDa, known as the type I and type II receptors, respectively. Molecular cloning has yielded genes encoding two type II receptors (ActRII and ActRIIB) and at least two type I receptors (ALK2 and ALK4). These receptors are members of a larger family of receptor serine kinases, which includes receptors for transforming growth factor beta ( TGF beta), bone morphogenetic proteins and the Drosophila protein, decapentaplegic. Receptors I and II form a stable complex after ligand binding, resulting in phosphorylation of receptor I by receptor II. We have begun to identify intracellular targets of these molecules by using the intracellular domains of both ActRIs and ActRIIs as probes in the two-hybrid system, a cloning strategy designed to detect interacting proteins in yeast.[1]

References

  1. Activin receptors: cellular signalling by receptor serine kinases. Zimmerman, C.M., Mathews, L.S. Biochem. Soc. Symp. (1996) [Pubmed]
 
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