2qlu
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Crystal structure of Activin receptor type II kinase domain from human
OverviewOverview
Activin receptor type IIB (ActRIIB), a type II TGF-beta serine/threonine, kinase receptor, is integral to the activin and myostatin signaling, pathway. Ligands such as activin and myostatin bind to activin type II, receptors (ActRIIA, ActRIIB), and the GS domains of type I receptors are, phosphorylated by type II receptors. Myostatin, a negative regulator of, skeletal muscle growth, is regarded as a potential therapeutic target and, binds to ActRIIB effectively, and to a lesser extent, to ActRIIA. The, high-resolution structure of human ActRIIB kinase domain in complex with, adenine establishes the conserved bilobal architecture consistent with all, other catalytic kinase domains. The crystal structure reveals that the, adenine has a considerably different orientation from that of the adenine, moiety of ATP observed in other kinase structures due to the lack of an, interaction by ribose-phosphate moiety and the presence of tautomers with, two different protonation states at the N9 nitrogen. Although the, Lys217-Glu230 salt bridge is absent, the unphosphorylated activation loop, of ActRIIB adopts a conformation similar to that of the fully active form., Unlike the type I TGF-beta receptor, where a partially conserved Ser280 is, a gatekeeper residue, the AcRIIB structure possesses Thr265 with a back, pocket supported by Phe247. Taken together, these structural features, provide a molecular basis for understanding the coupled activity and, recognition specificity for human ActRIIB kinase domain and for the, rational design of selective inhibitors.
About this StructureAbout this Structure
2QLU is a Single protein structure of sequence from Homo sapiens with and as ligands. Active as Receptor protein serine/threonine kinase, with EC number 2.7.11.30 Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of activin receptor type IIB kinase domain from human at 2.0 Angstrom resolution., Han S, Loulakis P, Griffor M, Xie Z, Protein Sci. 2007 Oct;16(10):2272-7. PMID:17893364
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- Homo sapiens
- Receptor protein serine/threonine kinase
- Single protein
- Han, S.
- ADE
- SO4
- Actriib
- Alternative splicing
- Atp-binding
- Disease mutation
- Glycoprotein
- Magnesium
- Manganese
- Membrane
- Metal-binding
- Nucleotide-binding
- Serine/threonine kinase receptor
- Serine/threonine-protein kinase
- Tgf-beta
- Transferase
- Transmembrane