Homoserine transacetylase MetX from Mycobacterium abscessus

Experimental Data Snapshot

  • Resolution: 1.69 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.159 

wwPDB Validation   3D Report Full Report

This is version 1.5 of the entry. See complete history


Structural analysis of mycobacterial homoserine transacetylases central to methionine biosynthesis reveals druggable active site.

Chaton, C.T.Rodriguez, E.S.Reed, R.W.Li, J.Kenner, C.W.Korotkov, K.V.

(2019) Sci Rep 9: 20267-20267

  • DOI: https://doi.org/10.1038/s41598-019-56722-2
  • Primary Citation of Related Structures:  
    5W8O, 5W8P, 6PUX

  • PubMed Abstract: 

    Mycobacterium tuberculosis is the cause of the world's most deadly infectious disease. Efforts are underway to target the methionine biosynthesis pathway, as it is not part of the host metabolism. The homoserine transacetylase MetX converts L-homoserine to O-acetyl-L-homoserine at the committed step of this pathway. In order to facilitate structure-based drug design, we determined the high-resolution crystal structures of three MetX proteins, including M. tuberculosis (MtMetX), Mycolicibacterium abscessus (MaMetX), and Mycolicibacterium hassiacum (MhMetX). A comparison of homoserine transacetylases from other bacterial and fungal species reveals a high degree of structural conservation amongst the enzymes. Utilizing homologous structures with bound cofactors, we analyzed the potential ligandability of MetX. The deep active-site tunnel surrounding the catalytic serine yielded many consensus clusters during mapping, suggesting that MtMetX is highly druggable.

  • Organizational Affiliation

    Department of Molecular & Cellular Biochemistry and the Center for Structural Biology, University of Kentucky, Lexington, KY, 40536, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Homoserine O-acetyltransferase
A, B
370Mycobacteroides abscessus ATCC 19977Mutation(s): 0 
Gene Names: metXMAB_3688
Find proteins for B1MG17 (Mycobacteroides abscessus (strain ATCC 19977 / DSM 44196 / CCUG 20993 / CIP 104536 / JCM 13569 / NCTC 13031 / TMC 1543 / L948))
Explore B1MG17 
Go to UniProtKB:  B1MG17
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB1MG17
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PO4

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
G [auth A]
H [auth A]
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
K [auth B]
O4 P
Query on GOL

Download Ideal Coordinates CCD File 
I [auth A],
L [auth B]
C3 H8 O3
Query on K

Download Ideal Coordinates CCD File 
C [auth A],
J [auth B]
Experimental Data & Validation

Experimental Data

  • Resolution: 1.69 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.159 
  • Space Group: P 65
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 197.92α = 90
b = 197.92β = 90
c = 51.3γ = 120
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesP20GM103486
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesP30GM110787

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-12
    Type: Initial release
  • Version 1.1: 2017-09-27
    Changes: Author supporting evidence
  • Version 1.2: 2019-11-27
    Changes: Database references, Structure summary
  • Version 1.3: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.4: 2020-01-15
    Changes: Database references
  • Version 1.5: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description