1U4N

Crystal Structure Analysis of the M211S/R215L EST2 mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Crystal Structure of an EST2 Mutant Unveils Structural Insights on the H Group of the Carboxylesterase/Lipase Family.

De Simone, G.Menchise, V.Alterio, V.Mandrich, L.Rossi, M.Manco, G.Pedone, C.

(2004) J.Mol.Biol. 343: 137-146

  • DOI: 10.1016/j.jmb.2004.08.014

  • PubMed Abstract: 
  • Esterase 2 (EST2) from the thermophilic eubacterium Alicyclobacillus acidocaldarius is a thermostable serine hydrolase belonging to the H group of the esterase/lipase family. This enzyme hydrolyzes monoacylesters of different acyl-chain length and va ...

    Esterase 2 (EST2) from the thermophilic eubacterium Alicyclobacillus acidocaldarius is a thermostable serine hydrolase belonging to the H group of the esterase/lipase family. This enzyme hydrolyzes monoacylesters of different acyl-chain length and various compounds with industrial interest. EST2 displays an optimal temperature at 70 degrees C and maximal activity with pNP-esters having acyl-chain bearing from six to eight carbon atoms. EST2 mutants with different substrate specificity were also designed, generated by site-directed mutagenesis, and biochemically characterized. To better define at structural level the enzyme reaction mechanism, a crystallographic analysis of one of these mutants, namely M211S/R215L, was undertaken. Here we report its three-dimensional structure at 2.10A resolution. Structural analysis of the enzyme revealed an unexpected dimer formation as a consequence of a domain-swapping event involving its N-terminal region. This phenomenon was absent in the case of the enzyme bound to an irreversible inhibitor having optimal substrate structural features. A detailed comparison of the enzyme structures before and following binding to this molecule showed a movement of the N-terminal helices resulting from a trans-cis isomerization of the F37-P38 peptide bond. These findings suggest that this carboxylesterase presents two distinct structural arrangements reminiscent of the open and closed forms already reported for lipases. Potential biological implications associated with the observed quaternary reorganization are here discussed in light of the biochemical properties of other lipolytic members of the H group.


    Related Citations: 
    • A Snapshot of the Transition State Analogue of a Novel Thermophilic Esterase Belonging to the Subfamily of Mammalian Hormone-Sensitive Lipase
      De Simone, G.,Galdiero, S.,Manco, G.,Lang, D.,Rossi, M.,Pedone, C.
      (2000) J.Mol.Biol. 303: 761
    • A Substrate-Induced Switch in the Reaction Mechanism of a Thermophilic Esterase: Kinetic Evidences and Structural Basis.
      De Simone, G.,Mandrich, L.,Menchise, V.,Giordano, V.,Febbraio, F.,Rossi, M.,Pedone, C.,Manco, G.
      (2004) J.Biol.Chem. 279: 6815


    Organizational Affiliation

    Dipartimento di Chimica Biologica-Sezione Biostrutture, University of Naples Federico II, via Mezzocannone 16, 80134, Italy. gmg@chemistry.unina.it




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CARBOXYLESTERASE EST2
A
310Alicyclobacillus acidocaldariusMutation(s): 2 
Find proteins for Q7SIG1 (Alicyclobacillus acidocaldarius)
Go to UniProtKB:  Q7SIG1
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.179 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 63.200α = 90.00
b = 83.080β = 90.00
c = 54.030γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-10-05
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2019-02-06
    Type: Advisory, Data collection, Database references, Source and taxonomy, Structure summary