Crystal structure of PTPL1 human tyrosine phosphatase mutated in colorectal cancer - evidence for a second phosphotyrosine substrate recognition pocket

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.177 

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Crystal Structure of Ptpl1/Fap-1 Human Tyrosine Phosphatase Mutated in Colorectal Cancer: Eveidence for a Second Phosphotyrosine Substrate Recognition Pocket

Villa, F.Deak, M.Bloomberg, G.B.Alessi, D.R.Van Aalten, D.M.F.

(2005) J Biol Chem 280: 8180

  • DOI: https://doi.org/10.1074/jbc.M412211200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Protein-tyrosine phosphatase-L1 (PTPL1, also known as FAP-1, PTP1E, PTP-BAS, and PTPN13) is mutated in a significant number of colorectal tumors and may play a role in down-regulating signaling responses mediated by phosphatidylinositol 3-kinase, although the precise substrates are as yet unknown. In this study, we describe a 1.8 A resolution crystal structure of a fully active fragment of PTPL1 encompassing the catalytic domain. PTPL1 adopts the standard PTP fold, albeit with an unusually positioned additional N-terminal helix, and shows an ordered phosphate in the active site. Interestingly, a positively charged pocket is located near the PTPL1 catalytic site, reminiscent of the second phosphotyrosine binding site in PTP1B, which is required to dephosphorylate peptides containing two adjacent phosphotyrosine residues (as occurs for example in the activated insulin receptor). We demonstrate that PTPL1, like PTP1B, interacts with and dephosphorylates a bis-phosphorylated insulin receptor peptide more efficiently than monophosphorylated peptides, indicating that PTPL1 may down-regulate the phosphatidylinositol 3-kinase pathway, by dephosphorylating insulin or growth factor receptors that contain tandem phosphotyrosines. The structure also reveals that four out of five PTPL1 mutations found in colorectal cancers are located on solvent-exposed regions remote from the active site, consistent with these mutants being normally active. In contrast, the fifth mutation, which changes Met-2307 to Thr, is close to the active site cysteine and decreases activity significantly. Our studies provide the first molecular description of the PTPL1 catalytic domain and give new insight into the function of PTPL1.

  • Organizational Affiliation

    Division of Biological Chemistry and Molecular Microbiology, School of Life Sciences, University of Dundee, DD1 5EH, Scotland.

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Entity ID: 1
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UniProt & NIH Common Fund Data Resources
Find proteins for Q12923 (Homo sapiens)
Explore Q12923 
Go to UniProtKB:  Q12923
PHAROS:  Q12923
Entity Groups  
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UniProt GroupQ12923
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.177 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.707α = 90
b = 59.193β = 113.05
c = 66.075γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-12-14
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-10-16
    Changes: Data collection, Experimental preparation, Other