Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 78.35 kDa 
• Atom Count: 4843 
• Residue Count: 568 
• Unique protein chains: 1

3RIP

Crystal Structure of human gamma-tubulin complex protein 4 (GCP4)

• DOI: 10.2210/pdb3RIP/pdb

• Classification: STRUCTURAL PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2011-04-14 Released: 2011-07-06 
• Deposition Author(s): Gregory-Pauron, L., Guillet, V., Mourey, L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.260 
• R-Value Work: 0.227 
• R-Value Observed: 0.228 

Literature

Crystal structure of gamma-tubulin complex protein GCP4 provides insight into microtubule nucleation.

Guillet, V., Knibiehler, M., Gregory-Pauron, L., Remy, M.H., Chemin, C., Raynaud-Messina, B., Bon, C., Kollman, J.M., Agard, D.A., Merdes, A., Mourey, L.

(2011) Nat Struct Mol Biol 18: 915-919

• PubMed: 21725292 
• DOI: 10.1038/nsmb.2083
• Primary Citation of Related Structures:  
  3RIP


• PubMed Abstract: 
  

Microtubule nucleation in all eukaryotes involves γ-tubulin small complexes (γTuSCs) that comprise two molecules of γ-tubulin bound to γ-tubulin complex proteins (GCPs) GCP2 and GCP3. In many eukaryotes, multiple γTuSCs associate with GCP4, GCP5 and GCP6 into large γ-tubulin ring complexes (γTuRCs). Recent cryo-EM studies indicate that a scaffold similar to γTuRCs is formed by lateral association of γTuSCs, with the C-terminal regions of GCP2 and GCP3 binding γ-tubulin molecules. However, the exact role of GCPs in microtubule nucleation remains unknown. Here we report the crystal structure of human GCP4 and show that its C-terminal domain binds directly to γ-tubulin. The human GCP4 structure is the prototype for all GCPs, as it can be precisely positioned within the γTuSC envelope, revealing the nature of protein-protein interactions and conformational changes regulating nucleation activity.

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Organizational Affiliation: 

Institut de Pharmacologie et de Biologie Structurale, Centre National de la Recherche Scientifique, Toulouse, France.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Gamma-tubulin complex component 4	A	677	Homo sapiens	Mutation(s): 0  Gene Names: TUBGCP4, 76P, GCP4
Find proteins for Q9UGJ1 (Homo sapiens) Explore Q9UGJ1  Go to UniProtKB:  Q9UGJ1
NIH Common Fund Data Resources
PHAROS:  Q9UGJ1 GTEx:  ENSG00000137822

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MRD	A	(4R)-2-METHYLPENTANE-2,4-DIOL C6 H14 O2 SVTBMSDMJJWYQN-RXMQYKEDSA-N
GOL	A	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.260 
• R-Value Work: 0.227 
• R-Value Observed: 0.228 
• Space Group: P 6₃ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 214.95	α = 90
b = 214.95	β = 90
c = 128.66	γ = 120

Software Package:

Software Name	Purpose
ADSC	data collection
PHASER	phasing
REFMAC	refinement
XDS	data reduction
XSCALE	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-04-14 
• Released Date: 2011-07-06 
Deposition Author(s): Gregory-Pauron, L., Guillet, V., Mourey, L.

Revision History 

• Version 1.0: 2011-07-06
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2013-07-03
  Changes: Database references