3ORV

Crystal Structure of the Y294H-MauG/pre-Methylamine Dehydrogenase Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.139 
  • R-Value Observed: 0.141 

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Literature

Functional Importance of Tyrosine 294 and the Catalytic Selectivity for the Bis-Fe(IV) State of MauG Revealed by Replacement of This Axial Heme Ligand with Histidine .

Abu Tarboush, N.Jensen, L.M.Feng, M.Tachikawa, H.Wilmot, C.M.Davidson, V.L.

(2010) Biochemistry 49: 9783-9791

  • DOI: 10.1021/bi101254p
  • Primary Citation of Related Structures:  
    3ORV

  • PubMed Abstract: 
  • The diheme enzyme MauG catalyzes the posttranslational modification of a precursor protein of methylamine dehydrogenase (preMADH) to complete the biosynthesis of its protein-derived tryptophan tryptophylquinone (TTQ) cofactor. It catalyzes three sequential two-electron oxidation reactions which proceed through a high-valent bis-Fe(IV) redox state ...

    The diheme enzyme MauG catalyzes the posttranslational modification of a precursor protein of methylamine dehydrogenase (preMADH) to complete the biosynthesis of its protein-derived tryptophan tryptophylquinone (TTQ) cofactor. It catalyzes three sequential two-electron oxidation reactions which proceed through a high-valent bis-Fe(IV) redox state. Tyr294, the unusual distal axial ligand of one c-type heme, was mutated to His, and the crystal structure of Y294H MauG in complex with preMADH reveals that this heme now has His-His axial ligation. Y294H MauG is able to interact with preMADH and participate in interprotein electron transfer, but it is unable to catalyze the TTQ biosynthesis reactions that require the bis-Fe(IV) state. This mutation affects not only the redox properties of the six-coordinate heme but also the redox and CO-binding properties of the five-coordinate heme, despite the 21 Å separation of the heme iron centers. This highlights the communication between the hemes which in wild-type MauG behave as a single diheme unit. Spectroscopic data suggest that Y294H MauG can stabilize a high-valent redox state equivalent to Fe(V), but it appears to be an Fe(IV)═O/π radical at the five-coordinate heme rather than the bis-Fe(IV) state. This compound I-like intermediate does not catalyze TTQ biosynthesis, demonstrating that the bis-Fe(IV) state, which is stabilized by Tyr294, is specifically required for this reaction. The TTQ biosynthetic reactions catalyzed by wild-type MauG do not occur via direct contact with the Fe(IV)═O heme but via long-range electron transfer through the six-coordinate heme. Thus, a critical feature of the bis-Fe(IV) species may be that it shortens the electron transfer distance from preMADH to a high-valent heme iron.


    Organizational Affiliation

    Department of Biochemistry, University of Mississippi Medical Center, Jackson, Mississippi 39216, United States.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Methylamine utilization protein mauGA, B373Paracoccus denitrificans PD1222Mutation(s): 1 
Gene Names: mauGPden_4736
EC: 1
UniProt
Find proteins for Q51658 (Paracoccus denitrificans (strain Pd 1222))
Explore Q51658 
Go to UniProtKB:  Q51658
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Methylamine dehydrogenase light chainC, E137Paracoccus denitrificans PD1222Mutation(s): 0 
Gene Names: mauA
EC: 1.4.99.3 (PDB Primary Data), 1.4.9.1 (UniProt)
UniProt
Find proteins for P22619 (Paracoccus denitrificans)
Explore P22619 
Go to UniProtKB:  P22619
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Methylamine dehydrogenase heavy chainD, F386Paracoccus denitrificans PD1222Mutation(s): 0 
Gene Names: Pden_4730
EC: 1.4.99.3 (PDB Primary Data), 1.4.9.1 (UniProt)
UniProt
Find proteins for A1BB97 (Paracoccus denitrificans (strain Pd 1222))
Explore A1BB97 
Go to UniProtKB:  A1BB97
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 7 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEC (Subject of Investigation/LOI)
Query on HEC

Download Ideal Coordinates CCD File 
H [auth A], I [auth A], K [auth B], L [auth B]HEME C
C34 H34 Fe N4 O4
HXQIYSLZKNYNMH-LJNAALQVSA-N
 Ligand Interaction
P6G
Query on P6G

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T [auth F]HEXAETHYLENE GLYCOL
C12 H26 O7
IIRDTKBZINWQAW-UHFFFAOYSA-N
 Ligand Interaction
PG4
Query on PG4

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R [auth F], S [auth F]TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
 Ligand Interaction
PGE
Query on PGE

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N [auth D]TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
 Ligand Interaction
PEG
Query on PEG

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P [auth D], Q [auth E], U [auth F]DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
EDO
Query on EDO

Download Ideal Coordinates CCD File 
M [auth B], O [auth D], V [auth F]1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

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G [auth A], J [auth B]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
0AF
Query on 0AF
C, EL-PEPTIDE LINKINGC11 H12 N2 O3TRP
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.139 
  • R-Value Observed: 0.141 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.527α = 109.94
b = 83.524β = 91.54
c = 107.782γ = 105.78
Software Package:
Software NamePurpose
Blu-Icedata collection
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
REFMACphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-11-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance