Crystal Structure of G protein coupled receptor kinase 6 bound to AMPPNP

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 

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The Structure of G Protein-coupled Receptor Kinase (GRK)-6 Defines a Second Lineage of GRKs.

Lodowski, D.T.Tesmer, V.M.Benovic, J.L.Tesmer, J.J.

(2006) J Biol Chem 281: 16785-16793

  • DOI: https://doi.org/10.1074/jbc.M601327200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    We describe the 2.6-A crystal structure of human G protein-coupled receptor kinase (GRK)-6, a key regulator of dopaminergic signaling and lymphocyte chemotaxis. GRK6 is a member of the GRK4 subfamily of GRKs, which is represented in most, if not all, metazoans. Comparison of GRK6 with GRK2 confirms that the catalytic core of all GRKs consists of intimately associated kinase and regulator of G protein signaling (RGS) homology domains. Despite being in complex with an ATP analog, the kinase domain of GRK6 remains in an open, presumably inactive conformation, suggesting that G protein-coupled receptors activate GRKs by inducing kinase domain closure. The structure reveals a putative phospholipid-binding site near the N terminus of GRK6 and structural elements within the kinase substrate channel that likely influence G protein-coupled receptor access and specificity. The crystalline GRK6 RGS homology domain forms an extensive dimer interface using conserved hydrophobic residues distinct from those in GRK2 that bind Galpha(q), although dimerization does not appear to occur in solution and is not required for receptor phosphorylation.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Institute for Cellular and Molecular Biology, University of Texas, Austin, TX 78712-0165, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
G protein-coupled receptor kinase 6
A, B
576Homo sapiensMutation(s): 3 
Gene Names: GRK6GPRK6
EC: 2.7.1
UniProt & NIH Common Fund Data Resources
Find proteins for P43250 (Homo sapiens)
Explore P43250 
Go to UniProtKB:  P43250
PHAROS:  P43250
GTEx:  ENSG00000198055 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP43250
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 120.164α = 90
b = 59.27β = 102.58
c = 221.095γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
Adxvdata processing
ELVESdata scaling
MOSFLMdata reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-25
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.5: 2023-08-23
    Changes: Data collection, Refinement description