4FQ5

Crystal structure of the maleate isomerase Iso(C200A) from Pseudomonas putida S16 with maleate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural and computational studies of the maleate isomerase from Pseudomonas putida S16 reveal a breathing motion wrapping the substrate inside.

Chen, D.Tang, H.Lu, Y.Zhang, Z.Shen, K.Lin, K.Zhao, Y.L.Wu, G.Xu, P.

(2013) Mol Microbiol 87: 1237-1244

  • DOI: 10.1111/mmi.12163
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Nicotine is an environmental toxicant in tobacco waste, imposing a serious hazard for human health. Some bacteria including Pseudomonas spp. strains are able to metabolize nicotine to non-toxic compounds. The pyrrolidine pathway of nicotine degradation in Pseudomonas putida S16 has recently been revealed ...

    Nicotine is an environmental toxicant in tobacco waste, imposing a serious hazard for human health. Some bacteria including Pseudomonas spp. strains are able to metabolize nicotine to non-toxic compounds. The pyrrolidine pathway of nicotine degradation in Pseudomonas putida S16 has recently been revealed. The maleate isomerase (Pp-Iso) catalyses the last step in nicotine degradation of P. putida S16, the cis-trans isomerization of maleate to fumarate. In this study, we determined the crystal structures of both wild type isomerase by itself and its C200A point mutant in complex with its substrate maleate, to resolutions of 2.95 Å and 2.10 Å respectively. Our structures reveal that Asn17 and Asn169 play critical roles in recognizing the maleate by site-directed mutants' analysis. Surprisingly, our structure shows that the maleate is completely wrapped inside the isomerase. Examination of the structure prompted us to hypothesize that the β2-α2 loop and the β6-α7 loop have a breathing motion that regulates substrate/solvent entry and product departure. Our results of molecular dynamics simulation and enzymatic activity assay are fully consistent with this hypothesis. The isomerase probably uses this breathing motion to prevent the solvent from entering the active site and prohibit unproductive side reactions from happening.


    Organizational Affiliation

    State Key Laboratory of Microbial Metabolism & School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Maleate cis-trans isomeraseA, B281Pseudomonas putida S16Mutation(s): 1 
Gene Names: PPS_4060maiA
EC: 5.2.1.1
Find proteins for F8G0M3 (Pseudomonas putida (strain S16))
Explore F8G0M3 
Go to UniProtKB:  F8G0M3
Protein Feature View
 ( Mouse scroll to zoom / Hold left click to move )
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAE
Query on MAE

Download CCD File 
A, B
MALEIC ACID
C4 H4 O4
VZCYOOQTPOCHFL-UPHRSURJSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.725α = 90
b = 66.725β = 90
c = 421.606γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-07-24
    Type: Initial release
  • Version 1.1: 2016-12-21
    Changes: Structure summary
  • Version 1.2: 2017-11-15
    Changes: Refinement description