5JGJ

Crystal structure of GtmA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural, mechanistic and functional insight into gliotoxinbis-thiomethylation inAspergillus fumigatus.

Dolan, S.K.Bock, T.Hering, V.Owens, R.A.Jones, G.W.Blankenfeldt, W.Doyle, S.

(2017) Open Biol 7: --

  • DOI: 10.1098/rsob.160292
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Gliotoxin is an epipolythiodioxopiperazine (ETP) class toxin, contains a disulfide bridge that mediates its toxic effects via redox cycling and is produced by the opportunistic fungal pathogen Aspergillus fumigatus Self-resistance against gliotoxin i ...

    Gliotoxin is an epipolythiodioxopiperazine (ETP) class toxin, contains a disulfide bridge that mediates its toxic effects via redox cycling and is produced by the opportunistic fungal pathogen Aspergillus fumigatus Self-resistance against gliotoxin is effected by the gliotoxin oxidase GliT, and attenuation of gliotoxin biosynthesis is catalysed by gliotoxin S-methyltransferase GtmA. Here we describe the X-ray crystal structures of GtmA-apo (1.66 Å), GtmA complexed to S-adenosylhomocysteine (1.33 Å) and GtmA complexed to S-adenosylmethionine (2.28 Å), providing mechanistic insights into this important biotransformation. We further reveal that simultaneous elimination of the ability of A. fumigatus to dissipate highly reactive dithiol gliotoxin, via deletion of GliT and GtmA, results in the most significant hypersensitivity to exogenous gliotoxin observed to date. Indeed, quantitative proteomic analysis of ΔgliT::ΔgtmA reveals an uncontrolled over-activation of the gli-cluster upon gliotoxin exposure. The data presented herein reveal, for the first time, the extreme risk associated with intracellular dithiol gliotoxin biosynthesis-in the absence of an efficient dismutation capacity. Significantly, a previously concealed protective role for GtmA and functionality of ETP bis-thiomethylation as an ancestral protection strategy against dithiol compounds is now evident.


    Organizational Affiliation

    Department of Biology, Maynooth University, Maynooth, Co. Kildare, Ireland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
UbiE/COQ5 family methyltransferase, putative
A
289Aspergillus fumigatus Z5Mutation(s): 0 
Find proteins for A0A0J5Q3C4 (Aspergillus fumigatus Z5)
Go to UniProtKB:  A0A0J5Q3C4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.66 Å
  • R-Value Free: 0.186 
  • R-Value Work: 0.168 
  • Space Group: P 62
Unit Cell:
Length (Å)Angle (°)
a = 94.729α = 90.00
b = 94.729β = 90.00
c = 52.729γ = 120.00
Software Package:
Software NamePurpose
XDSdata reduction
PDB_EXTRACTdata extraction
PHENIXrefinement
SHELXDEphasing
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-03-01
    Type: Initial release
  • Version 1.1: 2018-02-21
    Type: Database references
  • Version 1.2: 2018-03-28
    Type: Data collection, Database references