3F5O

Crystal Structure of hTHEM2(undecan-2-one-CoA) complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.199 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The mechanisms of human hotdog-fold thioesterase 2 (hTHEM2) substrate recognition and catalysis illuminated by a structure and function based analysis

Cao, J.Xu, H.Zhao, H.Gong, W.Dunaway-Mariano, D.

(2009) Biochemistry 48: 1293-1304

  • DOI: 10.1021/bi801879z

  • PubMed Abstract: 
  • The focus of this paper is the hotdog-fold thioesterase THEM2 from human (hTHEM2; Swiss-Prot entry Q9NPJ3 ). In an earlier communication (Cheng, Z., Song, F., Shan, X., Wei, Z., Wang, Y., Dunaway-Mariano, D., and Gong, W. (2006) Crystal structure of ...

    The focus of this paper is the hotdog-fold thioesterase THEM2 from human (hTHEM2; Swiss-Prot entry Q9NPJ3 ). In an earlier communication (Cheng, Z., Song, F., Shan, X., Wei, Z., Wang, Y., Dunaway-Mariano, D., and Gong, W. (2006) Crystal structure of human thioesterase superfamily member 2, Biochem. Biophys. Res. Commun. 349, 172-177) we reported the apo crystal structure of hTHEM2. Herein, we report the results of an extensive hTHEM2 substrate screen, the structure determination of hTHEM2 complexed with the inert substrate analogue undecan-2-one-CoA (in which OC-CH(2)-S substitutes for OC-S) and the kinetic analysis of active site mutants. The work described in this paper represents the first reported structure-function based analysis of a human hotdog-fold thioesterase. The catalytic mechanism proposed involves the Asp65/Ser83 assisted attack of a water molecule at the Gly57/Asn50 polarized thioester CO and the Asn50 assisted departure of the thiolate leaving group. Thioesterase activity was observed with acyl-CoAs but not with the human acyl-ACP or with an acyl-Cys peptide. The medium-to-long-chain fatty acyl-CoAs displayed the smallest K(m) values. The substrate specificity profile was analyzed within the context of the liganded enzyme to define the structural determinants of substrate recognition. Based on the results of this structure-function analysis we hypothesize that the physiological role of hTHEM2 involves catalysis of the hydrolysis of cytosolic medium-to-long-chain acyl-CoA thioesters.


    Organizational Affiliation

    Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Thioesterase superfamily member 2
A, B, C, D, E, F, G, H
148Homo sapiensMutation(s): 0 
Gene Names: ACOT13 (THEM2)
EC: 3.1.2.-
Find proteins for Q9NPJ3 (Homo sapiens)
Go to Gene View: ACOT13
Go to UniProtKB:  Q9NPJ3
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, C, D, E, F, G, H
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
COA
Query on COA

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
COENZYME A
C21 H36 N7 O16 P3 S
RGJOEKWQDUBAIZ-IBOSZNHHSA-N
 Ligand Interaction
P6G
Query on P6G

Download SDF File 
Download CCD File 
B, C, E, G
HEXAETHYLENE GLYCOL
POLYETHYLENE GLYCOL PEG400
C12 H26 O7
IIRDTKBZINWQAW-UHFFFAOYSA-N
 Ligand Interaction
UOC
Query on UOC

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
undecan-2-one
C11 H22 O
KYWIYKKSMDLRDC-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 91.032α = 90.00
b = 110.632β = 90.00
c = 119.819γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data collection
MOLREPphasing
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-11-04 
  • Released Date: 2009-08-18 
  • Deposition Author(s): Xu, H., Gong, W.

Revision History 

  • Version 1.0: 2009-08-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance