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.

Macromolecule Content

• Total Structure Weight: 35251.78 
• Atom Count: 2419 
• Residue Count: 298 
• Unique protein chains: 1

1T48

Allosteric Inhibition of Protein Tyrosine Phosphatase 1B

• DOI: 10.2210/pdb1T48/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2004-04-28 Released: 2004-07-20 
• Deposition Author(s): Wiesmann, C., Barr, K.J., Kung, J., Zhu, J., Shen, W., Fahr, B.J., Zhong, M., Erlanson, D.A., Taylor, L., Randal, M., McDowell, R.S., Hansen, S.K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.255 
• R-Value Work: 0.211 

Literature

Allosteric inhibition of protein tyrosine phosphatase 1B

Wiesmann, C., Barr, K.J., Kung, J., Zhu, J., Erlanson, D.A., Shen, W., Fahr, B.J., Zhong, M., Taylor, L., Randal, M., McDowell, R.S., Hansen, S.K.

(2004) Nat.Struct.Mol.Biol. 11: 730-737

• PubMed: 15258570 
• DOI: 10.1038/nsmb803
• Primary Citation of Related Structures:  
  1T4J, 1T49


• PubMed Abstract: 
  

Obesity and type II diabetes are closely linked metabolic syndromes that afflict >100 million people worldwide. Although protein tyrosine phosphatase 1B (PTP1B) has emerged as a promising target for the treatment of both syndromes, the discovery of pharmaceutically acceptable inhibitors that bind at the active site remains a substantial challenge. Here we describe the discovery of an allosteric site in PTP1B. Crystal structures of PTP1B in complex with allosteric inhibitors reveal a novel site located approximately 20 A from the catalytic site. We show that allosteric inhibitors prevent formation of the active form of the enzyme by blocking mobility of the catalytic loop, thereby exploiting a general mechanism used by tyrosine phosphatases. Notably, these inhibitors exhibit selectivity for PTP1B and enhance insulin signaling in cells. Allosteric inhibition is a promising strategy for targeting PTP1B and constitutes a mechanism that may be applicable to other tyrosine phosphatases.

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Organizational Affiliation: 

Sunesis Pharmaceuticals, 341 Oyster Point Boulevard, South San Francisco, California 94080, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Protein-tyrosine phosphatase, non-receptor type 1	A	298	Homo sapiens	Mutation(s): 0  Gene Names: PTPN1 (PTP1B) EC: 3.1.3.48
Find proteins for P18031 (Homo sapiens) Go to Gene View: PTPN1 Go to UniProtKB:  P18031

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
BB3	A	3-(3,5-DIBROMO-4-HYDROXY-BENZOYL)-2-ETHYL-BENZOFURAN-6-SULFONIC ACID DIMETHYLAMIDE C19 H17 Br2 N O5 S FEYGJZKVMASWJB-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
BB3	IC50: 350000 nM BINDINGMOAD
BB3	IC50: 350000 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.255 
• R-Value Work: 0.211 
• Space Group: P 3₁ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 88.941	α = 90.00
b = 88.941	β = 90.00
c = 104.837	γ = 120.00

Software Package:

Software Name	Purpose
d*TREK	data reduction
d*TREK	data scaling
AMoRE	phasing
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-04-28 
• Released Date: 2004-07-20 
• Deposition Author(s): Wiesmann, C., Barr, K.J., Kung, J., Zhu, J., Shen, W., Fahr, B.J., Zhong, M., Erlanson, D.A., Taylor, L., Randal, M., McDowell, R.S., Hansen, S.K.

Revision History 

• Version 1.0: 2004-07-20
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance