Biological Assembly 1  

 3D View: Structure | Electron Density

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 14.55 kDa 
• Atom Count: 999 
• Residue Count: 110 
• Unique protein chains: 2

4K45

Auto-inhibition and phosphorylation-induced activation of PLC-gamma isozymes

• DOI: 10.2210/pdb4K45/pdb

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Rattus norvegicus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-04-11 Released: 2013-06-26 
• Deposition Author(s): Sondek, J., Hajicek, N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.198 
• R-Value Work: 0.173 
• R-Value Observed: 0.163 

Literature

Autoinhibition and Phosphorylation-Induced Activation of Phospholipase C-gamma Isozymes.

Hajicek, N., Charpentier, T.H., Rush, J.R., Harden, T.K., Sondek, J.

(2013) Biochemistry 52: 4810-4819

• PubMed: 23777354 
• DOI: 10.1021/bi400433b
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Multiple extracellular stimuli, such as growth factors and antigens, initiate signaling cascades through tyrosine phosphorylation and activation of phospholipase C-γ (PLC-γ) isozymes. Like most other PLCs, PLC-γ1 is basally autoinhibited by its X-Y linker, which separates the X- and Y-boxes of the catalytic core. The C-terminal SH2 (cSH2) domain within the X-Y linker is the critical determinant for autoinhibition of phospholipase activity. Release of autoinhibition requires an intramolecular interaction between the cSH2 domain and a phosphorylated tyrosine, Tyr783, also located within the X-Y linker. The molecular mechanisms that mediate autoinhibition and phosphorylation-induced activation have not been defined. Here, we describe structures of the cSH2 domain both alone and bound to a PLC-γ1 peptide encompassing phosphorylated Tyr783. The cSH2 domain remains largely unaltered by peptide engagement. Point mutations in the cSH2 domain located at the interface with the peptide were sufficient to constitutively activate PLC-γ1, suggesting that peptide engagement directly interferes with the capacity of the cSH2 domain to block the lipase active site. This idea is supported by mutations in a complementary surface of the catalytic core that also enhanced phospholipase activity.

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Organizational Affiliation: 

Department of Pharmacology and ‡Department of Biochemistry and Biophysics and Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine , Chapel Hill, North Carolina 27599-7365, United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase gamma-1	A	106	Rattus norvegicus	Mutation(s): 0  Gene Names: Plcg1 EC: 3.1.4.11
Find proteins for P10686 (Rattus norvegicus) Explore P10686  Go to UniProtKB:  P10686

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
1-phosphatidylinositol 4,5-bisphosphate phosphodiesterase gamma-1, short peptide	B	18	Rattus norvegicus	Mutation(s): 0  Gene Names: Plcg1 EC: 3.1.4.11
Find proteins for P10686 (Rattus norvegicus) Explore P10686  Go to UniProtKB:  P10686

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PTR	B	L-PEPTIDE LINKING	C9 H12 N O6 P		TYR

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 0.198 
• R-Value Work: 0.173 
• R-Value Observed: 0.163 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 29.013	α = 90
b = 54.506	β = 90
c = 59.865	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
PHASER	phasing
PHENIX	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-04-11 
• Released Date: 2013-06-26 
Deposition Author(s): Sondek, J., Hajicek, N.

Revision History 

• Version 1.0: 2013-06-26
  Type: Initial release
  
• Version 1.1: 2013-11-06
  Changes: Database references
• Version 1.2: 2014-01-22
  Changes: Database references