Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 111146.04 
• Atom Count: 6826 
• Residue Count: 966 
• Unique protein chains: 1

2CHZ

A pharmacological map of the PI3-K family defines a role for p110alpha in signaling: The structure of complex of phosphoinositide 3-kinase gamma with inhibitor PIK-93

• DOI: 10.2210/pdb2CHZ/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda


• Deposited: 2006-03-16 Released: 2006-05-22 
• Deposition Author(s): Knight, Z.A., Gonzalez, B., Feldman, M.E., Zunder, E.R., Goldenberg, D.D., Williams, O., Loewith, R., Stokoe, D., Balla, A., Toth, B., Balla, T., Weiss, W.A., Williams, R.L., Shokat, K.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.6 Å
• R-Value Free: 0.302 
• R-Value Work: 0.244 

Literature

A Pharmacological Map of the Pi3-K Family Defines a Role for P110Alpha in Signaling

Knight, Z.A., Gonzalez, B., Feldman, M.E., Zunder, E.R., Goldenberg, D.D., Williams, O., Loewith, R., Stokoe, D., Balla, A., Toth, B., Balla, T., Weiss, W.A., Williams, R.L., Shokat, K.M.

(2006) Cell 125: 733

• PubMed: 16647110 
• DOI: 10.1016/j.cell.2006.03.035
• Primary Citation of Related Structures:  
  2CHX, 2CHW


• PubMed Abstract: 
  

Phosphoinositide 3-kinases (PI3-Ks) are an important emerging class of drug targets, but the unique roles of PI3-K isoforms remain poorly defined. We describe here an approach to pharmacologically interrogate the PI3-K family. A chemically diverse panel of PI3-K inhibitors was synthesized, and their target selectivity was biochemically enumerated, revealing cryptic homologies across targets and chemotypes. Crystal structures of three inhibitors bound to p110gamma identify a conformationally mobile region that is uniquely exploited by selective compounds. This chemical array was then used to define the PI3-K isoforms required for insulin signaling. We find that p110alpha is the primary insulin-responsive PI3-K in cultured cells, whereas p110beta is dispensable but sets a phenotypic threshold for p110alpha activity. Compounds targeting p110alpha block the acute effects of insulin treatment in vivo, whereas a p110beta inhibitor has no effect. These results illustrate systematic target validation using a matrix of inhibitors that span a protein family.

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Organizational Affiliation: 

Department of Cellular and Molecular Pharmacology, Howard Hughes Medical Institute, University of California, San Francisco, CA 94143, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PHOSPHATIDYLINOSITOL-4,5-BISPHOSPHATE 3-KINASE CATALYTIC SUBUNIT GAMMA ISOFORM	A	966	Homo sapiens	Mutation(s): 0  Gene Names: PIK3CG EC: 2.7.1.153
Find proteins for P48736 (Homo sapiens) Go to Gene View: PIK3CG Go to UniProtKB:  P48736

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
093	A	N-(5-(4-CHLORO-3-(2-HYDROXY-ETHYLSULFAMOYL)- PHENYLTHIAZOLE-2-YL)-ACETAMIDE PIK-93; N-[(2Z)-5-(4-CHLORO-3-{[(2-HYDROXYETHYL)AMINO]SULFONYL}PHENYL)-4-METHYL-1,3-THIAZOL-2(3H)-YLIDENE]ACETAMIDE C14 H16 Cl N3 O4 S2 JFVNFXCESCXMBC-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
093	Ki: 7 nM (99) BINDINGDB
093	IC50: 16 - 17 nM (99) BINDINGDB
93	IC50: 16 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.6 Å
• R-Value Free: 0.302 
• R-Value Work: 0.244 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 144.025	α = 90.00
b = 68.114	β = 95.21
c = 106.351	γ = 90.00

Software Package:

Software Name	Purpose
REFMAC	refinement
SCALA	data scaling
TRUNCATE	data scaling
AMoRE	phasing
MOSFLM	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-03-16 
• Released Date: 2006-05-22 
• Deposition Author(s): Knight, Z.A., Gonzalez, B., Feldman, M.E., Zunder, E.R., Goldenberg, D.D., Williams, O., Loewith, R., Stokoe, D., Balla, A., Toth, B., Balla, T., Weiss, W.A., Williams, R.L., Shokat, K.M.

Revision History 

• Version 1.0: 2006-05-22
  Type: Initial release
• Version 1.1: 2011-05-08
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance