1TQH

Covalent Reaction intermediate Revealed in Crystal Structure of the Geobacillus stearothermophilus Carboxylesterase Est30


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.168 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Covalent reaction intermediate revealed in crystal structure of the Geobacillus stearothermophilus carboxylesterase Est30.

Liu, P.Wang, Y.F.Ewis, H.E.Abdelal, A.T.Lu, C.D.Harrison, R.W.Weber, I.T.

(2004) J Mol Biol 342: 551-561

  • DOI: 10.1016/j.jmb.2004.06.069
  • Primary Citation of Related Structures:  
    1TQH

  • PubMed Abstract: 
  • Est30 is a thermophilic carboxylesterase cloned from Geobacillus stearothermophilus that showed optimal hydrolysis of esters with short acyl chains at 70 degrees C. Est30 is a member of a new family of carboxylesterases with representatives in other ...

    Est30 is a thermophilic carboxylesterase cloned from Geobacillus stearothermophilus that showed optimal hydrolysis of esters with short acyl chains at 70 degrees C. Est30 is a member of a new family of carboxylesterases with representatives in other Gram-positive bacteria. The crystal structure has been determined at 1.63A resolution using multiple anomalous dispersion data. The two-domain crystal structure showed a large domain with a modified alpha/beta hydrolase core including a seven, rather than an eight-stranded beta sheet, and a smaller cap domain comprising three alpha helices. The catalytic triad consists of residues Ser94, Asp193, and His223. A 100Da tetrahedral ligand was observed to be covalently bound to the side-chain of Ser94. The propyl acetate ligand represents the first tetrahedral intermediate in the reaction mechanism. Therefore, this Est30 crystal structure will help understand the mode of action of all enzymes in the serine hydrolase superfamily.


    Organizational Affiliation

    Department of Biology, Molecular Basis of Disease Program, Georgia State University, Atlanta, GA 30303, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Carboxylesterase precursorA247Geobacillus stearothermophilusMutation(s): 0 
Gene Names: estest30
EC: 3.1.1.1
Find proteins for Q06174 (Geobacillus stearothermophilus)
Explore Q06174 
Go to UniProtKB:  Q06174
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
4PA
Query on 4PA

Download CCD File 
A
PROPYL ACETATE
C5 H10 O2
YKYONYBAUNKHLG-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.168 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.654α = 90
b = 58.205β = 90
c = 179.045γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
SOLVEphasing
RESOLVEmodel building
ARP/wARPmodel building
SHELXL-97refinement
MAR345data collection
HKL-2000data scaling
RESOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-09-28
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2014-04-30
    Changes: Data collection
  • Version 1.4: 2017-10-11
    Changes: Refinement description