Esterase2 (EaEst2) from Exiguobacterium antarcticum

Experimental Data Snapshot

  • Resolution: 1.74 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 

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Structural and Biochemical Insights into Bis(2-hydroxyethyl) Terephthalate Degrading Carboxylesterase Isolated from Psychrotrophic Bacterium Exiguobacterium antarcticum.

Hwang, J.Yoo, W.Shin, S.C.Kim, K.K.Kim, H.W.Do, H.Lee, J.H.

(2023) Int J Mol Sci 24

  • DOI: https://doi.org/10.3390/ijms241512022
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    This study aimed to elucidate the crystal structure and biochemically characterize the carboxylesterase Ea Est2, a thermotolerant biocatalyst derived from Exiguobacterium antarcticum , a psychrotrophic bacterium. Sequence and phylogenetic analyses showed that Ea Est2 belongs to the Family XIII group of carboxylesterases. Ea Est2 has a broad range of substrate specificities for short-chain p -nitrophenyl ( p NP) esters, 1-naphthyl acetate (1-NA), and 1-naphthyl butyrate (1-NB). Its optimal pH is 7.0, losing its enzymatic activity at temperatures above 50 °C. Ea Est2 showed degradation activity toward bis(2-hydroxyethyl) terephthalate (BHET), a polyethylene terephthalate degradation intermediate. We determined the crystal structure of Ea Est2 at a 1.74 Å resolution in the ligand-free form to investigate BHET degradation at a molecular level. Finally, the biochemical stability and immobilization of a crosslinked enzyme aggregate (CLEA) were assessed to examine its potential for industrial application. Overall, the structural and biochemical characterization of Ea Est2 demonstrates its industrial potency as a biocatalyst.

  • Organizational Affiliation

    Research Unit of Cryogenic Novel Material, Korea Polar Research Institute, Incheon 21990, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Thermostable carboxylesterase Est30246Exiguobacterium antarcticum B7Mutation(s): 0 
Gene Names: Eab7_2224
Find proteins for K0AFS0 (Exiguobacterium antarcticum (strain B7))
Explore K0AFS0 
Go to UniProtKB:  K0AFS0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupK0AFS0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.74 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.362α = 90
b = 67.789β = 90
c = 89.617γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Research Foundation (NRF, Korea)Korea, Republic OfPM22030

Revision History  (Full details and data files)

  • Version 1.0: 2023-09-20
    Type: Initial release