Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 35396.15 
• Atom Count: 2499 
• Residue Count: 302 
• Unique protein chains: 1

2F6F

The structure of the S295F mutant of human PTP1B

• DOI: 10.2210/pdb2F6F/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): 1 


• Deposited: 2005-11-29 Released: 2005-12-06 
• Deposition Author(s): Montalibet, J., Skorey, K., McKay, D., Scapin, G., Asante-Appiah, E., Kennedy, B.P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.203 
• R-Value Work: 0.183 

Literature

Residues distant from the active site influence protein-tyrosine phosphatase 1B inhibitor binding.

Montalibet, J., Skorey, K., McKay, D., Scapin, G., Asante-Appiah, E., Kennedy, B.P.

(2006) J.Biol.Chem. 281: 5258-5266

• PubMed: 16332678 
• DOI: 10.1074/jbc.M511546200


• PubMed Abstract: 
  

Regions of protein-tyrosine phosphatase (PTP) 1B that are distant from the active site yet affect inhibitor binding were identified by a novel library screen. This screen was based on the observation that expression of v-Src in yeast leads to lethality, which can be rescued by the coexpression of PTP1B. However, this rescue is lost when yeast are grown in the presence of PTP1B inhibitors. To identify regions of PTP1B (amino acids 1-400, catalytic domain plus 80-amino acid C-terminal tail) that can affect the binding of the difluoromethyl phosphonate (DFMP) inhibitor 7-bromo-6-difluoromethylphosphonate 3-naphthalenenitrile, a library coexpressing PTP1B mutants and v-Src was generated, and the ability of yeast to grow in the presence of the inhibitor was evaluated. PTP1B inhibitor-resistant mutations were found to concentrate on helix alpha7 and its surrounding region, but not in the active site. No resistant amino acid substitutions were found to occur in the C-terminal tail, suggesting that this region has little effect on active-site inhibitor binding. An in-depth characterization of a resistant substitution localizing to region alpha7 (S295F) revealed that this change minimally affected enzyme catalytic activity, but significantly reduced the potency of a panel of structurally diverse DFMP PTP1B inhibitors. This loss of inhibitor potency was found to be due to the difluoro moiety of these inhibitors because only the difluoro inhibitors were shifted. For example, the inhibitor potency of a monofluorinated or non-fluorinated analog of one of these DFMP inhibitors was only minimally affected. Using this type of library screen, which can scan the nearly full-length PTP1B sequence (catalytic domain and C-terminal tail) for effects on inhibitor binding, we have been able to identify novel regions of PTP1B that specifically affect the binding of DFMP inhibitors.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, Merck Frosst Center for Therapeutic Research, Pointe-Claire, Quebec H9R 4P8, Canada.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Tyrosine-protein phosphatase, non-receptor type 1	A	302	Homo sapiens	Mutation(s): 1  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 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CL	A	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG	A	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.203 
• R-Value Work: 0.183 
• Space Group: P 3₁ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 88.330	α = 90.00
b = 88.330	β = 90.00
c = 104.180	γ = 120.00

Software Package:

Software Name	Purpose
CCP4	data scaling
MOSFLM	data reduction
SCALA	data scaling
CNX	refinement
CNX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-11-29 
• Released Date: 2005-12-06 
• Deposition Author(s): Montalibet, J., Skorey, K., McKay, D., Scapin, G., Asante-Appiah, E., Kennedy, B.P.

Revision History 

• Version 1.0: 2005-12-06
  Type: Initial release
• Version 1.1: 2008-05-01
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance