2b0u

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spinqualitylabelsall models 2b0u, resolution 2.800Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

The Structure of the Follistatin:Activin Complex

Contents 1 Overview 2 Disease 3 About this Structure 4 Reference

Overview

TGF-beta ligands stimulate diverse cellular differentiation and growth, responses by signaling through type I and II receptors. Ligand, antagonists, such as follistatin, block signaling and are essential, regulators of physiological responses. Here we report the structure of, activin A, a TGF-beta ligand, bound to the high-affinity antagonist, follistatin. Two follistatin molecules encircle activin, neutralizing the, ligand by burying one-third of its residues and its receptor binding, sites. Previous studies have suggested that type I receptor binding would, not be blocked by follistatin, but the crystal structure reveals that the, follistatin N-terminal domain has an unexpected fold that mimics a, universal type I receptor motif and occupies this receptor binding site., The formation of follistatin:BMP:type I receptor complexes can be, explained by the stoichiometric and geometric arrangement of the, activin:follistatin complex. The mode of ligand binding by follistatin has, important implications for its ability to neutralize homo- and, heterodimeric ligands of this growth factor family.

Disease

Known disease associated with this structure: Polycystic ovary syndrome OMIM:[136470]

About this Structure

2B0U is a Protein complex structure of sequences from Homo sapiens with IR3, MLI and MPD as ligands. Full crystallographic information is available from OCA.

Reference

The structure of the follistatin:activin complex reveals antagonism of both type I and type II receptor binding., Thompson TB, Lerch TF, Cook RW, Woodruff TK, Jardetzky TS, Dev Cell. 2005 Oct;9(4):535-43. PMID:16198295

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