2FK8

Crystal structure of Hma (MmaA4) from Mycobacterium tuberculosis complexed with S-adenosylmethionine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Further insight into S-adenosylmethionine-dependent methyltransferases: structural characterization of Hma, an enzyme essential for the biosynthesis of oxygenated mycolic acids in Mycobacterium tuberculosis.

Boissier, F.Bardou, F.Guillet, V.Uttenweiler-Joseph, S.Daffe, M.Quemard, A.Mourey, L.

(2006) J.Biol.Chem. 281: 4434-4445

  • DOI: 10.1074/jbc.M510250200
  • Primary Citation of Related Structures:  2FK7

  • PubMed Abstract: 
  • Mycolic acids are major and specific components of the cell envelope of Mycobacteria that include Mycobacterium tuberculosis, the causative agent of tuberculosis. Their metabolism is the target of the most efficient antitubercular drug currently used ...

    Mycolic acids are major and specific components of the cell envelope of Mycobacteria that include Mycobacterium tuberculosis, the causative agent of tuberculosis. Their metabolism is the target of the most efficient antitubercular drug currently used in therapy, and the enzymes that are involved in the production of mycolic acids represent important targets for the development of new drugs effective against multidrug-resistant strains. Among these are the S-adenosylmethionine-dependent methyltransferases (SAM-MTs) that catalyze the introduction of key chemical modifications in defined positions of mycolic acids. Some of these subtle structural variations are known to be crucial for both the virulence of the tubercle bacillus and the permeability of the mycobacterial cell envelope. We report here the structural characterization of the enzyme Hma (MmaA4), a SAM-MT that is unique in catalyzing the introduction of a methyl branch together with an adjacent hydroxyl group essential for the formation of both keto- and methoxymycolates in M. tuberculosis. Despite the high propensity of Hma to proteolytic degradation, the enzyme was produced and crystallized, and its three-dimensional structure in the apoform and in complex with S-adenosylmethionine was solved to about 2 A. Thestructuresshowtheimportantroleplayedbythemodificationsfound within mycolic acid SAM-MTs, especially thealpha2-alpha3 motif and the chemical environment of the active site. Essential information with respect to cofactor and substrate binding, selectivity and specificity, and about the mechanism of catalytic reaction were derived.


    Organizational Affiliation

    Département Mécanismes Moléculaires des Infections Mycobactériennes, Institut de Pharmacologie et de Biologie Structurale du CNRS et de l'Université Paul Sabatier, Toulouse, France




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
methoxy mycolic acid synthase 4
A
318Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)Gene Names: mmaA4 (hma, mma4)
EC: 2.1.1.-
Find proteins for Q79FX8 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Go to UniProtKB:  Q79FX8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SAM
Query on SAM

Download SDF File 
Download CCD File 
A
S-ADENOSYLMETHIONINE
C15 H22 N6 O5 S
MEFKEPWMEQBLKI-FCKMPRQPSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.179 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 56.779α = 90.00
b = 56.779β = 90.00
c = 199.035γ = 120.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
REFMACrefinement
CCP4data scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-01-17
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Source and taxonomy, Version format compliance