5JGL

Crystal structure of GtmA in complex with S-Adenosylmethionine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 

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Ligand Structure Quality Assessment 


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:  
    5JGK, 5JGJ, 5JGL

  • 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 is effected by the gliotoxin oxidase GliT, and attenuation of gliotoxin biosynthesis is catalysed by gliotoxin S -methyltransferase GtmA ...

    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

    Department of Biology, Maynooth University, Maynooth, Co. Kildare, Ireland sean.doyle@nuim.ie.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
UbiE/COQ5 family methyltransferase, putativeA, B289Aspergillus fumigatusMutation(s): 9 
Gene Names: Y699_02735
UniProt
Find proteins for A0A0J5Q3C4 (Aspergillus fumigatus Z5)
Explore A0A0J5Q3C4 
Go to UniProtKB:  A0A0J5Q3C4
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SAM (Subject of Investigation/LOI)
Query on SAM

Download Ideal Coordinates CCD File 
C [auth A], E [auth B]S-ADENOSYLMETHIONINE
C15 H22 N6 O5 S
MEFKEPWMEQBLKI-FCKMPRQPSA-N
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
D [auth A], F [auth B]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
SAM Binding MOAD:  5JGL Kd: 1.25e+4 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.989α = 90
b = 114.142β = 104.55
c = 56.438γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

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