5JGK

Crystal structure of GtmA in complex with SAH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.33 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.139 

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 <i>Aspergillus fumigatus </i> Self-resistance against gl ...

    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 Δ gliT ::Δ gtmA 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

    Institute of Biochemistry, Biotechnology and Bioinformatics, Technische Universität Braunschweig, Spielmannstrasse 7, 38106 Braunschweig, Germany.,Department of Biology, Maynooth University, Maynooth, Co. Kildare, Ireland sean.doyle@nuim.ie.,Helmholtz Centre for Infection Research, Structure and Function of Proteins, Inhoffenstraße 7, 38124 Braunschweig, Germany.,Department of Biology, Maynooth University, Maynooth, Co. Kildare, Ireland.,Helmholtz Centre for Infection Research, Structure and Function of Proteins, Inhoffenstraße 7, 38124 Braunschweig, Germany wulf.blankenfeldt@helmholtz-hzi.de.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
UbiE/COQ5 family methyltransferase, putative
A, B
289Aspergillus fumigatus Z5Mutation(s): 0 
Find proteins for A0A0J5Q3C4 (Aspergillus fumigatus Z5)
Go to UniProtKB:  A0A0J5Q3C4
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
SAH
Query on SAH

Download SDF File 
Download CCD File 
A, B
S-ADENOSYL-L-HOMOCYSTEINE
C14 H20 N6 O5 S
ZJUKTBDSGOFHSH-WFMPWKQPSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
SAHKd: 12600 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.33 Å
  • R-Value Free: 0.166 
  • R-Value Work: 0.139 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 48.748α = 90.00
b = 109.301β = 112.25
c = 59.856γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
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