2AI6

Solution structure of human phosphohistidine phosphatase 1


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with favorable non-bond energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solution structure and catalytic mechanism of human protein histidine phosphatase 1.

Gong, W.Li, Y.Cui, G.Hu, J.Fang, H.Jin, C.Xia, B.

(2009) Biochem.J. 418: 337-344

  • DOI: 10.1042/BJ20081571
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Protein histidine phosphorylation exists widely in vertebrates, and it plays important roles in signal transduction and other cellular functions. However, knowledge about eukaryotic PHPT (protein histidine phosphatase) is still very limited. To date, ...

    Protein histidine phosphorylation exists widely in vertebrates, and it plays important roles in signal transduction and other cellular functions. However, knowledge about eukaryotic PHPT (protein histidine phosphatase) is still very limited. To date, only one vertebrate PHPT has been discovered, and two crystal structures of hPHPT1 (human PHPT1) have been solved. However, these two structures gave different ligand-binding sites and co-ordination patterns. In the present paper, we have solved the solution structures of hPHPT1 in both P(i)-free and P(i)-bound states. Through comparison of the structures, along with a mutagenesis study, we have determined the active site of hPHPT1. In contrast with previous results, our results indicate that the active site is located between helix alpha1 and loop L5. His(53) was identified to be the catalytic residue, and the NH groups of residues His(53), Ala(54) and Ala(96) and the OH group of Ser(94) should act as anchors of P(i) or substrate by forming H-bonds with P(i). On the basis of our results, a catalytic mechanism is proposed for hPHPT1: the imidazole ring of His(53) serves as a general base to activate a water molecule, and the activated water would attack the substrate as a nucleophile in the catalysis; the positively charged side chain of Lys(21) can help stabilize the transition state. No similar catalytic mechanism can be found in the EzCatDB database.


    Organizational Affiliation

    Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing 100871, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
14 kDa phosphohistidine phosphatase
A
125Homo sapiensMutation(s): 0 
Gene Names: PHPT1 (PHP14)
EC: 3.9.1.3
Find proteins for Q9NRX4 (Homo sapiens)
Go to Gene View: PHPT1
Go to UniProtKB:  Q9NRX4
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 21 
  • Selection Criteria: structures with favorable non-bond energy 
  • Olderado: 2AI6 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-10-17
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance