2BCJ | pdb_00002bcj

Crystal Structure of G Protein-Coupled Receptor Kinase 2 in Complex with Galpha-q and Gbetagamma Subunits

• PDB DOI: https://doi.org/10.2210/pdb2BCJ/pdb

• Classification: TRANSFERASE/HYDROLASE
• Organism(s): Bos taurus, Rattus norvegicus, Mus musculus
• Expression System: Trichoplusia ni
• Mutation(s): Yes 
• Membrane Protein: Yes  OPM


• Deposited: 2005-10-19 Released: 2005-12-20 
• Deposition Author(s): Tesmer, J.J.G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.06 Å
• R-Value Free: 
  0.292 (Depositor) 
• R-Value Work: 
  0.243 (Depositor), 0.250 (DCC) 
• R-Value Observed: 
  0.236 (Depositor) 

Starting Model: experimental

Literature

Snapshot of Activated G Proteins at the Membrane: The Gq-GRK2-G Complex

Tesmer, V.M., Kawano, T., Shankaranarayanan, A., Kozasa, T., Tesmer, J.J.G.

(2005) Science 310: 1686-1690

• PubMed: 16339447 
• DOI: https://doi.org/10.1126/science.1118890
• Primary Citation of Related Structures:  
  2BCJ


• PubMed Abstract: 
  

  G protein-coupled receptor kinase 2 (GRK2) plays a key role in the desensitization of G protein-coupled receptor signaling by phosphorylating activated heptahelical receptors and by sequestering heterotrimeric G proteins. We report the atomic structure of GRK2 in complex with Galphaq and Gbetagamma, in which the activated Galpha subunit of Gq is fully dissociated from Gbetagamma and dramatically reoriented from its position in the inactive Galphabetagamma heterotrimer. Galphaq forms an effector-like interaction with the GRK2 regulator of G protein signaling (RGS) homology domain that is distinct from and does not overlap with that used to bind RGS proteins such as RGS4.

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Organizational Affiliation: 

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

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 4-mer - A1B1C1D1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 166.78 kDa 
• Atom Count: 10,878 
• Modeled Residue Count: 1,345 
• Deposited Residue Count: 1,453 
• Unique protein chains: 4

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
G-protein-coupled receptor kinase 2	A	689	Bos taurus	Mutation(s): 1  Gene Names: GRK2, ADRBK1 EC: 2.7.11.15 Membrane Entity: Yes
UniProt
Find proteins for P21146 (Bos taurus) Explore P21146  Go to UniProtKB:  P21146

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1	B	340	Bos taurus	Mutation(s): 1  Gene Names: GNB1
UniProt
Find proteins for P62871 (Bos taurus) Explore P62871  Go to UniProtKB:  P62871

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2	C [auth G]	71	Bos taurus	Mutation(s): 1  Gene Names: GNG2 Membrane Entity: Yes
UniProt
Find proteins for P63212 (Bos taurus) Explore P63212  Go to UniProtKB:  P63212

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
Guanine nucleotide-binding protein G(i) subunit alpha-1, Guanine nucleotide-binding protein G(q) subunit alpha chimera	D [auth Q]	353	Rattus norvegicus, Mus musculus This entity is chimeric	Mutation(s): 0  Gene Names: Gnai1, Gnai-1, Gnaq EC: 3.6.5 Membrane Entity: Yes
UniProt
Find proteins for P10824 (Rattus norvegicus) Explore P10824  Go to UniProtKB:  P10824
Find proteins for P21279 (Mus musculus) Explore P21279  Go to UniProtKB:  P21279
UniProt Groups	P21279P10824

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GDP	G [auth Q]	GUANOSINE-5'-DIPHOSPHATE C10 H15 N5 O11 P2 QGWNDRXFNXRZMB-UUOKFMHZSA-N
ALF	F [auth Q]	TETRAFLUOROALUMINATE ION Al F4 UYOMQIYKOOHAMK-UHFFFAOYSA-J
MG	E [auth Q]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.06 Å
• R-Value Free:  0.292 (Depositor) 
• R-Value Work:  0.243 (Depositor), 0.250 (DCC) 
• R-Value Observed: 0.236 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 64.918	α = 90
b = 129.954	β = 95.81
c = 122.764	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-2000	data reduction
SCALEPACK	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2005-12-20 
Deposition Author(s): Tesmer, J.J.G.

Revision History  

• Version 1.0: 2005-12-20
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.3: 2017-06-28
  Changes: Database references, Source and taxonomy, Structure summary
• Version 1.4: 2023-08-23
  Changes: Data collection, Database references, Derived calculations, Refinement description
• Version 1.5: 2024-10-16
  Changes: Structure summary