5H3H

Esterase (EaEST) from Exiguobacterium antarcticum


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.184 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Crystal Structure and Functional Characterization of an Esterase (EaEST) from Exiguobacterium antarcticum.

Lee, C.W.Kwon, S.Park, S.H.Kim, B.Y.Yoo, W.Ryu, B.H.Kim, H.W.Shin, S.C.Kim, S.Park, H.Kim, T.D.Lee, J.H.

(2017) PLoS One 12: e0169540-e0169540

  • DOI: 10.1371/journal.pone.0169540
  • Primary Citation of Related Structures:  
    5H3H

  • PubMed Abstract: 
  • A novel microbial esterase, EaEST, from a psychrophilic bacterium Exiguobacterium antarcticum B7, was identified and characterized. To our knowledge, this is the first report describing structural analysis and biochemical characterization of an esterase isolated from the genus Exiguobacterium ...

    A novel microbial esterase, EaEST, from a psychrophilic bacterium Exiguobacterium antarcticum B7, was identified and characterized. To our knowledge, this is the first report describing structural analysis and biochemical characterization of an esterase isolated from the genus Exiguobacterium. Crystal structure of EaEST, determined at a resolution of 1.9 Å, showed that the enzyme has a canonical α/β hydrolase fold with an α-helical cap domain and a catalytic triad consisting of Ser96, Asp220, and His248. Interestingly, the active site of the structure of EaEST is occupied by a peracetate molecule, which is the product of perhydrolysis of acetate. This result suggests that EaEST may have perhydrolase activity. The activity assay showed that EaEST has significant perhydrolase and esterase activity with respect to short-chain p-nitrophenyl esters (≤C8), naphthyl derivatives, phenyl acetate, and glyceryl tributyrate. However, the S96A single mutant had low esterase and perhydrolase activity. Moreover, the L27A mutant showed low levels of protein expression and solubility as well as preference for different substrates. On conducting an enantioselectivity analysis using R- and S-methyl-3-hydroxy-2-methylpropionate, a preference for R-enantiomers was observed. Surprisingly, immobilized EaEST was found to not only retain 200% of its initial activity after incubation for 1 h at 80°C, but also retained more than 60% of its initial activity after 20 cycles of reutilization. This research will serve as basis for future engineering of this esterase for biotechnological and industrial applications.


    Organizational Affiliation

    Department of Polar Sciences, University of Science and Technology, Incheon, Republic of Korea.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Abhydrolase domain-containing proteinA, B272Exiguobacterium antarcticum B7Mutation(s): 0 
Gene Names: Eab7_1456
UniProt
Find proteins for K0ACL0 (Exiguobacterium antarcticum (strain B7))
Explore K0ACL0 
Go to UniProtKB:  K0ACL0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupK0ACL0
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
F50
Query on F50

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
ETHANEPEROXOIC ACID
C2 H4 O3
KFSLWBXXFJQRDL-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.184 
  • Space Group: P 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.765α = 90
b = 76.765β = 90
c = 68.161γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data processing
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-01-11
    Type: Initial release
  • Version 1.1: 2022-10-19
    Changes: Database references