Crystal Structure of Domain-Swapped OSR1 kinase domain

Experimental Data Snapshot

  • Resolution: 2.25 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.199 

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Crystal structure of domain-swapped STE20 OSR1 kinase domain.

Lee, S.J.Cobb, M.H.Goldsmith, E.J.

(2008) Protein Sci 18: 304-313

  • DOI: https://doi.org/10.1002/pro.27
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    OSR1 (oxidative stress-responsive-1) and SPAK (Ste20/Sps1-related proline/alanine-rich kinase) belong to the GCK-VI subfamily of Ste20 group kinases. OSR1 and SPAK are key regulators of NKCCs (Na(+)/K(+)/2Cl(-) cotransporters) and activated by WNK family members (with-no-lysine kinase), mutations of which are known to cause Gordon syndrome, an autosomal dominant form of inherited hypertension. The crystal structure of OSR1 kinase domain has been solved at 2.25 A. OSR1 forms a domain-swapped dimer in an inactive conformation, in which P+1 loop and alphaEF helix are swapped between dimer-related monomers. Structural alignment with nonswapped Ste20 TAO2 kinase indicates that the integrity of chemical interactions in the kinase domain is well preserved in the domain-swapped interfaces. The OSR1 kinase domain has now been added to a growing list of domain-swapped protein kinases recently reported, suggesting that the domain-swapping event provides an additional layer of complexity in regulating protein kinase activity.

  • Organizational Affiliation

    Department of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, 75390-9041, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Serine/threonine-protein kinase OSR1
A, B, C, D
290Homo sapiensMutation(s): 0 
Gene Names: OXSR1KIAA1101OSR1
UniProt & NIH Common Fund Data Resources
Find proteins for O95747 (Homo sapiens)
Explore O95747 
Go to UniProtKB:  O95747
PHAROS:  O95747
GTEx:  ENSG00000172939 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO95747
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.25 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.208α = 90
b = 104.484β = 90
c = 162.903γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-02-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-25
    Changes: Refinement description
  • Version 1.3: 2018-01-24
    Changes: Structure summary
  • Version 1.4: 2024-02-21
    Changes: Data collection, Database references, Derived calculations