1P8A

Solution structure of the low molecular weight protein tyrosine phosphatase from Tritrichomonas foetus


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Solution structure of the low-molecular-weight protein tyrosine phosphatase from Tritrichomonas foetus reveals a flexible phosphate binding loop.

Gustafson, C.L.Stauffacher, C.V.Hallenga, K.Van Etten, R.L.

(2005) Protein Sci 14: 2515-2525

  • DOI: 10.1110/ps.051618805
  • Primary Citation of Related Structures:  
    1P8A

  • PubMed Abstract: 
  • Eukaryotic low-molecular-weight protein tyrosine phosphatases (LMW PTPs) contain a conserved serine, a histidine with an elevated pKa, and an active site asparagine that together form a highly conserved hydrogen bonding network. This network stabilizes the active site phosphate binding loop for optimal substrate binding and catalysis ...

    Eukaryotic low-molecular-weight protein tyrosine phosphatases (LMW PTPs) contain a conserved serine, a histidine with an elevated pKa, and an active site asparagine that together form a highly conserved hydrogen bonding network. This network stabilizes the active site phosphate binding loop for optimal substrate binding and catalysis. In the phosphatase from the bovine parasite Tritrichomonas foetus (TPTP), both the conserved serine (S37) and asparagine (N14) are present, but the conserved histidine has been replaced by a glutamine residue (Q67). Site-directed mutagenesis, kinetic, and spectroscopic experiments suggest that Q67 is located near the active site and is important for optimal catalytic activity. Kinetic experiments also suggest that S37 participates in the active site/hydrogen bonding network. Nuclear magnetic resonance spectroscopy was used to determine the three-dimensional structure of the TPTP enzyme and to further examine the roles of S37 and Q67. The backbone conformation of the TPTP phosphate binding loop is nearly superimposable with that of other tyrosine phosphatases, with N14 existing in a strained, left-handed conformation that is a hallmark of the active site hydrogen bonding network in the LMW PTPs. As expected, both S37 and Q67 are located at the active site, but in the consensus structure they are not within hydrogen bonding distance of N14. The hydrogen bond interactions that are observed in X-ray structures of LMW PTPs may in fact be transient in solution. Protein dynamics within the active site hydrogen bonding network appear to be affected by the presence of substrate or bound inhibitors such as inorganic phosphate.


    Organizational Affiliation

    Department of Chemistry, Purdue University, West Lafayette, IN 47907-2084, USA.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
protein tyrosine phosphatase A146Tritrichomonas suisMutation(s): 1 
EC: 3.1.3.48 (PDB Primary Data), 3.1.3.2 (UniProt)
Find proteins for O00810 (Tritrichomonas foetus)
Explore O00810 
Go to UniProtKB:  O00810
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 1P8A Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-06-15
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance