2r53
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(New page: 200px<br /><applet load="2r53" size="350" color="white" frame="true" align="right" spinBox="true" caption="2r53, resolution 2.1Å" /> '''Crystal structure ana...)
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Revision as of 09:08, 23 January 2008
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Crystal structure analysis of Bone Morphogenetic Protein-6 variant B2 (B2-BMP-6)
Overview
Bone morphogenetic proteins (BMPs), together with transforming growth, factor (TGF)-beta and activins/inhibins, constitute the TGF-beta, superfamily of ligands. This superfamily is formed by more than 30, structurally related secreted proteins. The crystal structure of human, BMP-6 was determined to a resolution of 2.1 A; the overall structure is, similar to that of other TGF-beta superfamily ligands, e.g. BMP-7. The, asymmetric unit contains the full dimeric BMP-6, indicating possible, asymmetry between the two monomeric subunits. Indeed, the conformation of, several loops differs between both monomers. In particular, the prehelix, loop, which plays a crucial role in the type I receptor interactions of, BMP-2, adopts two rather different conformations in BMP-6, indicating, possible dynamic flexibility of the prehelix loop in its unbound, conformation. Flexibility of this loop segment has been discussed as an, important feature required for promiscuous binding of different type I, receptors to BMPs. Further studies investigating the interaction of BMP-6, with different ectodomains of type I receptors revealed that, N-glycosylation at Asn73 of BMP-6 in the wrist epitope is crucial for, recognition by the activin receptor type I. In the absence of the, carbohydrate moiety, activin receptor type I-mediated signaling of BMP-6, is totally diminished. Thus, flexibility within the binding epitope of, BMP-6 and an unusual recognition motif, i.e. an N-glycosylation motif, possibly play an important role in type I receptor specificity of BMP-6.
About this Structure
2R53 is a Single protein structure of sequence from Homo sapiens with as ligand. Full crystallographic information is available from OCA.
Reference
Type I receptor binding of bone morphogenetic protein 6 is dependent on N-glycosylation of the ligand., Saremba S, Nickel J, Seher A, Kotzsch A, Sebald W, Mueller TD, FEBS J. 2007 Dec;275(1):172-83. Epub 2007 Dec 6. PMID:18070108
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