4L3G

Crystal Structure of the E113Q-MauG/pre-Methylamine Dehydrogenase Complex Aged 120 Days


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.158 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Carboxyl Group of Glu113 Is Required for Stabilization of the Diferrous and Bis-Fe(IV) States of MauG.

Abu Tarboush, N.Yukl, E.T.Shin, S.Feng, M.Wilmot, C.M.Davidson, V.L.

(2013) Biochemistry 52: 6358-6367

  • DOI: 10.1021/bi400905s
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The diheme enzyme MauG catalyzes a six-electron oxidation required for post-translational modification of a precursor of methylamine dehydrogenase (preMADH) to complete the biosynthesis of its protein-derived tryptophan tryptophylquinone (TTQ) cofact ...

    The diheme enzyme MauG catalyzes a six-electron oxidation required for post-translational modification of a precursor of methylamine dehydrogenase (preMADH) to complete the biosynthesis of its protein-derived tryptophan tryptophylquinone (TTQ) cofactor. Crystallographic studies have implicated Glu113 in the formation of the bis-Fe(IV) state of MauG, in which one heme is Fe(IV)═O and the other is Fe(IV) with His-Tyr axial ligation. An E113Q mutation had no effect on the structure of MauG but significantly altered its redox properties. E113Q MauG could not be converted to the diferrous state by reduction with dithionite but was only reduced to a mixed valence Fe(II)/Fe(III) state, which is never observed in wild-type (WT) MauG. Addition of H2O2 to E113Q MauG generated a high valence state that formed more slowly and was less stable than the bis-Fe(IV) state of WT MauG. E113Q MauG exhibited no detectable TTQ biosynthesis activity in a steady-state assay with preMADH as the substrate. It did catalyze the steady-state oxidation of quinol MADH to the quinone, but 1000-fold less efficiently than WT MauG. Addition of H2O2 to a crystal of the E113Q MauG-preMADH complex resulted in partial synthesis of TTQ. Extended exposure of these crystals to H2O2 resulted in hydroxylation of Pro107 in the distal pocket of the high-spin heme. It is concluded that the loss of the carboxylic group of Glu113 disrupts the redox cooperativity between hemes that allows rapid formation of the diferrous state and alters the distribution of high-valence species that participate in charge-resonance stabilization of the bis-Fe(IV) redox state.


    Organizational Affiliation

    Biochemistry and Physiology Department, College of Medicine, The University of Jordan , Amman, Jordan 11942.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Methylamine utilization protein MauG
A, B
373Paracoccus denitrificans (strain Pd 1222)Mutation(s): 1 
Gene Names: mauG
EC: 1.-.-.-
Find proteins for Q51658 (Paracoccus denitrificans (strain Pd 1222))
Go to UniProtKB:  Q51658
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
methylamine dehydrogenase light chain
C, E
137Paracoccus denitrificans (strain Pd 1222)Mutation(s): 0 
EC: 1.4.9.1
Find proteins for A1BBA0 (Paracoccus denitrificans (strain Pd 1222))
Go to UniProtKB:  A1BBA0
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
methylamine dehydrogenase heavy chain
D, F
385Paracoccus denitrificans (strain Pd 1222)Mutation(s): 0 
EC: 1.4.9.1
Find proteins for A1BB97 (Paracoccus denitrificans (strain Pd 1222))
Go to UniProtKB:  A1BB97
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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C, F
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

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A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
PGE
Query on PGE

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F
TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
 Ligand Interaction
HEC
Query on HEC

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A, B
HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
TRQ
Query on TRQ
C, E
L-PEPTIDE LINKINGC11 H10 N2 O4TRP
HYP
Query on HYP
A, B
L-PEPTIDE LINKINGC5 H9 N O3PRO
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.158 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 55.530α = 109.94
b = 83.520β = 91.54
c = 107.780γ = 105.78
Software Package:
Software NamePurpose
REFMACphasing
REFMACrefinement
HKL-2000data scaling
Blu-Icedata collection
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-09-04
    Type: Initial release
  • Version 1.1: 2013-10-09
    Type: Database references