4V2I

Biochemical characterization and structural analysis of a new cold- active and salt tolerant esterase from the marine bacterium Thalassospira sp


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.686 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.143 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Biochemical Characterization and Structural Analysis of a New Cold-Active and Salt-Tolerant Esterase from the Marine Bacterium Thalassospira Sp.

De Santi, C.Leiros, H.S.Di Scala, A.De Pascale, D.Altermark, B.Willassen, N.

(2016) Extremophiles 20: 323

  • DOI: 10.1007/s00792-016-0824-z

  • PubMed Abstract: 
  • A gene encoding an esterase, ThaEst2349, was identified in the marine psychrophilic bacterium Thalassospira sp. GB04J01. The gene was cloned and overexpressed in E. coli as a His-tagged fusion protein. The recombinant enzyme showed optimal activity a ...

    A gene encoding an esterase, ThaEst2349, was identified in the marine psychrophilic bacterium Thalassospira sp. GB04J01. The gene was cloned and overexpressed in E. coli as a His-tagged fusion protein. The recombinant enzyme showed optimal activity at 45 °C and the thermal stability displayed a retention of 75 % relative activity at 40 °C after 2 h. The optimal pH was 8.5 but the enzyme kept more than 75 % of its maximal activity between pH 8.0 and 9.5. ThaEst2349 also showed remarkable tolerance towards high concentrations of salt and it was active against short-chain p-nitrophenyl esters, displaying optimal activity with the acetate. The enzyme was tested for tolerance of organic solvents and the results are suggesting that it could function as an interesting candidate for biotechnological applications. The crystal structure of ThaEst2349 was determined to 1.69 Å revealing an asymmetric unit containing two chains, which also is the biological unit. The structure has a characteristic cap domain and a catalytic triad comprising Ser158, His285 and Asp255. To explain the cold-active nature of the enzyme, we compared it against thermophilic counterparts. Our hypothesis is that a high methionine content, less hydrogen bonds and less ion pairs render the enzyme more flexible at low temperatures.


    Organizational Affiliation

    NorStruct, Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, 9037, Tromsø, Norway.,Institute of Protein Biochemistry, National Research Council, Via P. Castellino, 111., 80131, Naples, Italy. concetta.d.santi@uit.no.,NorStruct, Department of Chemistry, Faculty of Science and Technology, UiT The Arctic University of Norway, 9037, Tromsø, Norway. concetta.d.santi@uit.no.,Institute of Protein Biochemistry, National Research Council, Via P. Castellino, 111., 80131, Naples, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ESTERASE/LIPASE
A, B
323Thalassospira sp. GB04J01Mutation(s): 0 
Gene Names: Est2349
EC: 3.1.1.1
Find proteins for A0A023T3X2 (Thalassospira sp. GB04J01)
Go to UniProtKB:  A0A023T3X2
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.686 Å
  • R-Value Free: 0.182 
  • R-Value Work: 0.143 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 73.326α = 90.00
b = 85.429β = 90.00
c = 91.747γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
PHASERphasing
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-01-13
    Type: Initial release
  • Version 1.1: 2016-07-20
    Type: Database references