TesA a major thioesterase from Mycobacterium tuberculosis

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.237 

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Biochemical and Structural Characterization of TesA, a Major Thioesterase Required for Outer-Envelope Lipid Biosynthesis in Mycobacterium tuberculosis.

Nguyen, P.C.Nguyen, V.S.Martin, B.P.Fourquet, P.Camoin, L.Spilling, C.D.Cavalier, J.F.Cambillau, C.Canaan, S.

(2018) J Mol Biol 430: 5120-5136

  • DOI: https://doi.org/10.1016/j.jmb.2018.09.017
  • Primary Citation of Related Structures:  
    6FVJ, 6FW5

  • PubMed Abstract: 

    With the high number of patients infected by tuberculosis and the sharp increase of drug-resistant tuberculosis cases, developing new drugs to fight this disease has become increasingly urgent. In this context, analogs of the naturally occurring enolphosphates Cyclipostins and Cyclophostin (CyC analogs) offer new therapeutic opportunities. The CyC analogs display potent activity both in vitro and in infected macrophages against several pathogenic mycobacteria including Mycobacterium tuberculosis and Mycobacterium abscessus. Interestingly, these CyC inhibitors target several enzymes with active-site serine or cysteine residues that play key roles in mycobacterial lipid and cell wall metabolism. Among them, TesA, a putative thioesterase involved in the synthesis of phthiocerol dimycocerosates (PDIMs) and phenolic glycolipids (PGLs), has been identified. These two lipids (PDIM and PGL) are non-covalently bound to the outer cell wall in several human pathogenic mycobacteria and are important virulence factors. Herein, we used biochemical and structural approaches to validate TesA as an effective pharmacological target of the CyC analogs. We confirmed both thioesterase and esterase activities of TesA, and showed that the most active inhibitor CyC 17 binds covalently to the catalytic Ser104 residue leading to a total loss of enzyme activity. These data were supported by the X-ray structure, obtained at a 2.6-Å resolution, of a complex in which CyC 17 is bound to TesA. Our study provides evidence that CyC 17 inhibits the activity of TesA, thus paving the way to a new strategy for impairing the PDIM and PGL biosynthesis, potentially decreasing the virulence of associated mycobacterial species.

  • Organizational Affiliation

    Aix-Marseille University, CNRS, LISM, IMM FR3479, Marseille, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F, G, H
261Mycobacterium tuberculosisMutation(s): 0 
Gene Names: mbtB_1mbtB_2
EC: 6.3.2
Find proteins for P9WQD5 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WQD5 
Go to UniProtKB:  P9WQD5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WQD5
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on E9H

Download Ideal Coordinates CCD File 
BA [auth G]
DA [auth H]
I [auth A]
M [auth B]
P [auth C]
BA [auth G],
DA [auth H],
I [auth A],
M [auth B],
P [auth C],
T [auth D],
W [auth E],
Y [auth F]
hexadecyl dihydrogen phosphate
C16 H35 O4 P
Query on MPD

Download Ideal Coordinates CCD File 
AA [auth F]
CA [auth G]
J [auth A]
K [auth A]
N [auth B]
AA [auth F],
CA [auth G],
J [auth A],
K [auth A],
N [auth B],
O [auth B],
R [auth C],
S [auth C],
U [auth D],
V [auth D],
X [auth E],
Z [auth F]
C6 H14 O2
Query on CA

Download Ideal Coordinates CCD File 
L [auth A],
Q [auth C]
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.237 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.07α = 90
b = 224.58β = 90
c = 222.21γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-24
    Type: Initial release
  • Version 1.1: 2018-12-19
    Changes: Data collection, Database references