1s4y

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|GENE= ACVR2B ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 Mus musculus]), INHBA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])
|GENE= ACVR2B ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 Mus musculus]), INHBA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])
|DOMAIN=<span class='plainlinks'>[http://www.ncbi.nlm.nih.gov/Structure/cdd/cddsrv.cgi?uid=pfam01064 Activin_recp], [http://www.ncbi.nlm.nih.gov/Structure/cdd/cddsrv.cgi?uid=pfam00019 TGF_beta]</span>
|DOMAIN=<span class='plainlinks'>[http://www.ncbi.nlm.nih.gov/Structure/cdd/cddsrv.cgi?uid=pfam01064 Activin_recp], [http://www.ncbi.nlm.nih.gov/Structure/cdd/cddsrv.cgi?uid=pfam00019 TGF_beta]</span>
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1s4y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1s4y OCA], [http://www.ebi.ac.uk/pdbsum/1s4y PDBsum], [http://www.fli-leibniz.de/cgi-bin/ImgLib.pl?CODE=1kfv JenaLib], [http://www.rcsb.org/pdb/explore.do?structureId=1s4y RCSB]</span>
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|RELATEDENTRY=
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1s4y FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1s4y OCA], [http://www.ebi.ac.uk/pdbsum/1s4y PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1s4y RCSB]</span>
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}}
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[[Category: transferase]]
[[Category: transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Mar 25 23:25:42 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:37:23 2008''

Revision as of 20:37, 30 March 2008

Image:1s4y.gif


PDB ID 1s4y

Drag the structure with the mouse to rotate
, resolution 2.30Å
Gene: ACVR2B (Mus musculus), INHBA (Homo sapiens)
Activity: Non-specific serine/threonine protein kinase, with EC number 2.7.11.1
Domains: Activin_recp, TGF_beta
Resources: FirstGlance, OCA, PDBsum, RCSB
Coordinates: save as pdb, mmCIF, xml



Crystal structure of the activin/actrIIb extracellular domain


Overview

A new crystal structure of activin in complex with the extracellular domain of its type II receptor (ActRIIb-ECD) shows that the ligand exhibits an unexpected flexibility. The motion in the activin dimer disrupts its type I receptor interface, which may account for the disparity in its affinity for type I versus type II receptors. We have measured the affinities of activin and its antagonist inhibin for ActRIIb-ECD and found that the affinity of the 2-fold symmetric homodimer activin for ActRIIb-ECD depends on the availability of two spatially coupled ActRIIb-ECD molecules, whereas the affinity of the heterodimer inhibin does not. Our results indicate that activin's affinity for its two receptor types is greatly influenced by their membrane-restricted setting. We propose that activin affinity is modulated by the ligand flexibility and that cooperativity is achieved by binding to two ActRII chains that immobilize activin in a type I binding-competent orientation.

About this Structure

1S4Y is a Protein complex structure of sequences from Homo sapiens and Mus musculus. Full crystallographic information is available from OCA.

Reference

A flexible activin explains the membrane-dependent cooperative assembly of TGF-beta family receptors., Greenwald J, Vega ME, Allendorph GP, Fischer WH, Vale W, Choe S, Mol Cell. 2004 Aug 13;15(3):485-9. PMID:15304227

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