2QLU

Crystal structure of Activin receptor type II kinase domain from human


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.216 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of activin receptor type IIB kinase domain from human at 2.0 Angstrom resolution

Han, S.Loulakis, P.Griffor, M.Xie, Z.

(2007) Protein Sci 16: 2272-2277

  • DOI: https://doi.org/10.1110/ps.073068407
  • Primary Citation of Related Structures:  
    2QLU

  • PubMed Abstract: 

    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.


  • Organizational Affiliation

    Pfizer, Inc., Pfizer Global Research and Development, Groton, Connecticut 06340, USA. seungil.han@pfizer.com


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Activin receptor type IIB314Homo sapiensMutation(s): 0 
EC: 2.7.11.30
UniProt & NIH Common Fund Data Resources
Find proteins for Q13705 (Homo sapiens)
Explore Q13705 
Go to UniProtKB:  Q13705
PHAROS:  Q13705
GTEx:  ENSG00000114739 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ13705
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.216 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 98.217α = 90
b = 98.217β = 90
c = 71.345γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
AMoREphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Released Date: 2007-11-20 
  • Deposition Author(s): Han, S.

Revision History  (Full details and data files)

  • Version 1.0: 2007-11-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-02-21
    Changes: Data collection, Database references, Derived calculations