Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

Global Symmetry: Cyclic - C3  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 90.61 kDa 
• Atom Count: 6694 
• Modelled Residue Count: 824 
• Deposited Residue Count: 828 
• Unique protein chains: 1

1ZOI

Crystal Structure of a Stereoselective Esterase from Pseudomonas putida IFO12996

• PDB DOI: 10.2210/pdb1ZOI/pdb

• Classification: HYDROLASE
• Organism(s): Pseudomonas putida
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2005-05-13 Released: 2006-05-02 
• Deposition Author(s): Elmi, F., Lee, H.T., Huang, J.Y., Hsieh, Y.C., Wang, Y.L., Chen, Y.J., Shaw, S.Y., Chen, C.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.239 
• R-Value Work: 0.220 
• R-Value Observed: 0.220 

Literature

Stereoselective esterase from Pseudomonas putida IFO12996 reveals alpha/beta hydrolase folds for D-beta-acetylthioisobutyric acid synthesis

Elmi, F., Lee, H.T., Huang, J.Y., Hsieh, Y.C., Wang, Y.L., Chen, Y.J., Shaw, S.Y., Chen, C.J.

(2005) J Bacteriol 187: 8470-8476

• PubMed: 16321951 
• DOI: 10.1128/JB.187.24.8470-8476.2005
• Primary Citation of Related Structures:  
  1ZOI


• PubMed Abstract: 
  

Esterase (EST) from Pseudomonas putida IFO12996 catalyzes the stereoselective hydrolysis of methyl dl-beta-acetylthioisobutyrate (dl-MATI) to produce d-beta-acetylthioisobutyric acid (DAT), serving as a key intermediate for the synthesis of angiotensin-converting enzyme inhibitors. The EST gene was cloned and expressed in Escherichia coli; the recombinant protein is a non-disulfide-linked homotrimer with a monomer molecular weight of 33,000 in both solution and crystalline states, indicating that these ESTs function as trimers. EST hydrolyzed dl-MATI to produce DAT with a degree of conversion of 49.5% and an enantiomeric excess value of 97.2% at an optimum pH of about 8 to 10 and an optimum temperature of about 57 to 67 degrees C. The crystal structure of EST has been determined by X-ray diffraction to a resolution of 1.6 A, confirming that EST is a member of the alpha/beta hydrolase fold superfamily of enzymes and includes a catalytic triad of Ser97, Asp227, and His256. The active site is located approximately in the middle of the molecule at the end of a pocket approximately 12 A deep. EST can hydrolyze the methyl ester group without affecting the acetylthiol ester moiety in dl-MATI. The examination of substrate specificity of EST toward other linear esters revealed that the enzyme showed specific activity toward methyl esters and that it recognized the configuration at C-2.

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Organizational Affiliation: 

Life Science Group, National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
esterase	A, B, C	276	Pseudomonas putida	Mutation(s): 0  EC: 3.1
UniProt
Find proteins for Q3HWU8 (Pseudomonas putida) Explore Q3HWU8  Go to UniProtKB:  Q3HWU8

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.239 
• R-Value Work: 0.220 
• R-Value Observed: 0.220 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 50.556	α = 90
b = 98.108	β = 90
c = 153.63	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
SCALA	data scaling
CNS	refinement
HKL-2000	data reduction
CCP4	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-05-13 
• Released Date: 2006-05-02 
Deposition Author(s): Elmi, F., Lee, H.T., Huang, J.Y., Hsieh, Y.C., Wang, Y.L., Chen, Y.J., Shaw, S.Y., Chen, C.J.

Revision History  

• Version 1.0: 2006-05-02
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance