4Y5R

Crystal Structure of a T67A MauG/pre-Methylamine Dehydrogenase Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A T67A mutation in the proximal pocket of the high-spin heme of MauG stabilizes formation of a mixed-valent Fe(II)/Fe(III) state and enhances charge resonance stabilization of the bis-Fe(IV) state.

Shin, S.Feng, M.Li, C.Williamson, H.R.Choi, M.Wilmot, C.M.Davidson, V.L.

(2015) Biochim.Biophys.Acta 1847: 709-716

  • DOI: 10.1016/j.bbabio.2015.04.008

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

    The diheme enzyme MauG catalyzes a six-electron oxidation required for posttranslational modification of a precursor of methylamine dehydrogenase (preMADH) to complete the biosynthesis of its protein-derived tryptophan tryptophylquinone (TTQ) cofactor. One heme is low-spin with ligands provided by His205 and Tyr294, and the other is high-spin with a ligand provided by His35. The side chain methyl groups of Thr67 and Leu70 are positioned at a distance of 3.4Å on either side of His35, maintaining a hydrophobic environment in the proximal pocket of the high-spin heme and restricting the movement of this ligand. Mutation of Thr67 to Ala in the proximal pocket of the high-spin heme prevented reduction of the low-spin heme by dithionite, yielding a mixed-valent state. The mutation also enhanced the stabilization of the charge-resonance-transition of the high-valent bis-FeIV state that is generated by addition of H2O2. The rates of electron transfer from TTQ biosynthetic intermediates to the high-valent form of T67A MauG were similar to that of wild-type MauG. These results are compared to those previously reported for mutation of residues in the distal pocket of the high-spin heme that also affected the redox properties and charge resonance transition stabilization of the high-valent state of the hemes. However, given the position of residue 67, the structure of the variant protein and the physical nature of the T67A mutation, the basis for the effects of the T67A mutation must be different from those of the mutations of the residues in the distal heme pocket.


    Organizational Affiliation

    Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, St. Paul, MN 55108, USA.,Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32827, USA. Electronic address: victor.davidson@ucf.edu.,Department of Bioengineering and Biotechnology, College of Engineering, Chonnam National University, Chonnam, South Korea.,Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, FL 32827, USA.,Department of Chemistry, Tougaloo College, Tougaloo, MS 39174, USA.,Department of Optometry, College of Energy and Biotechnology, Seoul National University of Science and Technology, Seoul 139-743, South Korea.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Methylamine utilization protein MauG
A, B
355Paracoccus 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
125Paracoccus denitrificansMutation(s): 0 
Gene Names: mauA
EC: 1.4.9.1
Find proteins for P22619 (Paracoccus denitrificans)
Go to UniProtKB:  P22619
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Methylamine dehydrogenase heavy chain
D, F
376Paracoccus 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 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
HEC
Query on HEC

Download SDF File 
Download CCD File 
A, B
HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
0AF
Query on 0AF
C, E
L-PEPTIDE LINKINGC11 H12 N2 O3TRP
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.193 
  • 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
Aimlessdata scaling
XDSdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2015-02-11 
  • Released Date: 2015-06-17 
  • Deposition Author(s): Li, C., Wilmot, C.M.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited States--

Revision History 

  • Version 1.0: 2015-06-17
    Type: Initial release
  • Version 1.1: 2016-07-20
    Type: Data collection
  • Version 1.2: 2017-09-20
    Type: Author supporting evidence, Derived calculations, Refinement description