NMR solution structure of apo-MptpA

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

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This is version 1.3 of the entry. See complete history


The Apo-structure of the Low Molecular Weight Protein-tyrosine Phosphatase A (MptpA) from Mycobacterium tuberculosis Allows for Better Target-specific Drug Development.

Stehle, T.Sreeramulu, S.Lohr, F.Richter, C.Saxena, K.Jonker, H.R.Schwalbe, H.

(2012) J Biol Chem 287: 34569-34582

  • DOI: https://doi.org/10.1074/jbc.M112.399261
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Protein-tyrosine phosphatases (PTPs) and protein-tyrosine kinases co-regulate cellular processes. In pathogenic bacteria, they are frequently exploited to act as key virulence factors for human diseases. Mycobacterium tuberculosis, the causative organism of tuberculosis, secretes a low molecular weight PTP (LMW-PTP), MptpA, which is required for its survival upon infection of host macrophages. Although there is otherwise no sequence similarity of LMW-PTPs to other classes of PTPs, the phosphate binding loop (P-loop) CX(5)R and the loop containing a critical aspartic acid residue (D-loop), required for the catalytic activity, are well conserved. In most high molecular weight PTPs, ligand binding to the P-loop triggers a large conformational reorientation of the D-loop, in which it moves ∼10 Å, from an "open" to a "closed" conformation. Until now, there have been no ligand-free structures of LMW-PTPs described, and hence the dynamics of the D-loop have remained largely unknown for these PTPs. Here, we present a high resolution solution NMR structure of the free form of the MptpA LMW-PTP. In the absence of ligand and phosphate ions, the D-loop adopts an open conformation. Furthermore, we characterized the binding site of phosphate, a competitive inhibitor of LMW-PTPs, on MptpA and elucidated the involvement of both the P- and D-loop in phosphate binding. Notably, in LMW-PTPs, the phosphorylation status of two well conserved tyrosine residues, typically located in the D-loop, regulates the enzyme activity. PtkA, the kinase complementary to MptpA, phosphorylates these two tyrosine residues in MptpA. We characterized the MptpA-PtkA interaction by NMR spectroscopy to show that both the P- and D-loop form part of the binding interface.

  • Organizational Affiliation

    Institute for Organic Chemistry and Chemical Biology, ohann Wolfgang Goethe University, Max-von-Laue-Strasse 7, D-60438 Frankfurt am Main, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
LOW MOLECULAR WEIGHT PROTEIN-TYROSINE-PHOSPHATASE A164Mycobacterium tuberculosisMutation(s): 0 
Gene Names: ptpARv2234MT2293MTCY427.15
Find proteins for P9WIA1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WIA1 
Go to UniProtKB:  P9WIA1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WIA1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-08-15
    Type: Initial release
  • Version 1.1: 2012-08-29
    Changes: Database references
  • Version 1.2: 2012-10-24
    Changes: Database references
  • Version 1.3: 2023-06-14
    Changes: Data collection, Database references, Other