3H8E

Low pH native structure of leucine aminopeptidase from Pseudomonas putida


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the leucine aminopeptidase from Pseudomonas putida reveals the molecular basis for its enantioselectivity and broad substrate specificity.

Kale, A.Pijning, T.Sonke, T.Dijkstra, B.W.Thunnissen, A.M.

(2010) J.Mol.Biol. 398: 703-714

  • DOI: 10.1016/j.jmb.2010.03.042
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The zinc-dependent leucine aminopeptidase from Pseudomonas putida (ppLAP) is an important enzyme for the industrial production of enantiomerically pure amino acids. To provide a better understanding of its structure-function relationships, the enzyme ...

    The zinc-dependent leucine aminopeptidase from Pseudomonas putida (ppLAP) is an important enzyme for the industrial production of enantiomerically pure amino acids. To provide a better understanding of its structure-function relationships, the enzyme was studied by X-ray crystallography. Crystal structures of native ppLAP at pH 9.5 and pH 5.2, and in complex with the inhibitor bestatin, show that the overall folding and hexameric organization of ppLAP are very similar to those of the closely related di-zinc leucine aminopeptidases (LAPs) from bovine lens and Escherichia coli. At pH 9.5, the active site contains two metal ions, one identified as Mn(2+) or Zn(2+) (site 1), and the other as Zn(2+) (site 2). By using a metal-dependent activity assay it was shown that site 1 in heterologously expressed ppLAP is occupied mainly by Mn(2+). Moreover, it was shown that Mn(2+) has a significant activation effect when bound to site 1 of ppLAP. At pH 5.2, the active site of ppLAP is highly disordered and the two metal ions are absent, most probably due to full protonation of one of the metal-interacting residues, Lys267, explaining why ppLAP is inactive at low pH. A structural comparison of the ppLAP-bestatin complex with inhibitor-bound complexes of bovine lens LAP, along with substrate modelling, gave clear and new insights into its substrate specificity and high level of enantioselectivity.


    Organizational Affiliation

    Laboratory of Biophysical Chemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytosol aminopeptidase
A, B
497Pseudomonas putidaMutation(s): 0 
Gene Names: pepA
EC: 3.4.11.1
Find proteins for O86436 (Pseudomonas putida)
Go to UniProtKB:  O86436
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.212 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 116.946α = 90.00
b = 116.946β = 90.00
c = 137.899γ = 120.00
Software Package:
Software NamePurpose
SCALAdata scaling
PDB_EXTRACTdata extraction
CNSrefinement
PHASERphasing
ADSCdata collection
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-04-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2018-01-24
    Type: Structure summary