3SJL

Crystal Structure of the P107S-MauG/pre-Methylamine Dehydrogenase Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.142 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Proline 107 is a major determinant in maintaining the structure of the distal pocket and reactivity of the high-spin heme of MauG.

Feng, M.Jensen, L.M.Yukl, E.T.Wei, X.Liu, A.Wilmot, C.M.Davidson, V.L.

(2012) Biochemistry 51: 1598-1606

  • DOI: 10.1021/bi201882e
  • Primary Citation of Related Structures:  

  • 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. Crystallographic studies had shown that Pro107, which resides in the distal pocket of the high-spin heme of MauG, changes conformation upon binding of CO or NO to the heme iron. In this study, Pro107 was converted to Cys, Val, and Ser by site-directed mutagenesis. The structures of each of these MauG mutant proteins in complex with preMADH were determined, as were their physical and catalytic properties. P107C MauG was inactive, and the crystal structure revealed that Cys107 had been oxidatively modified to a sulfinic acid. Mass spectrometry revealed that this modification was present prior to crystallization. P107V MauG exhibited spectroscopic and catalytic properties that were similar to those of wild-type MauG, but P107V MauG was more susceptible to oxidative damage. The P107S mutation caused a structural change that resulted in the five-coordinate high-spin heme being converted to a six-coordinate heme with a distal axial ligand provided by Glu113. EPR and resonance Raman spectroscopy revealed this heme remained high-spin but with greatly increased rhombicity as compared to that of the axial signal of wild-type MauG. P107S MauG was resistant to reduction by dithionite and reaction with H(2)O(2) and unable to catalyze TTQ biosynthesis. These results show that the presence of Pro107 is critical in maintaining the proper structure of the distal heme pocket of the high-spin heme of MauG, allowing exogenous ligands to bind and directing the reactivity of the heme-activated oxygen during catalysis, thus minimizing the oxidation of other residues of MauG.


    Organizational Affiliation

    Department of Chemistry, Tougaloo College, Tougaloo, Mississippi 39174, United States.




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
386Paracoccus 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 6 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
CA
Query on CA

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

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B, D, F
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-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
PEG
Query on PEG

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A, B
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
MES
Query on MES

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F
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-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: 1.63 Å
  • R-Value Free: 0.180 
  • R-Value Work: 0.142 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 55.606α = 67.05
b = 89.001β = 79.51
c = 104.812γ = 79.72
Software Package:
Software NamePurpose
HKL-2000data reduction
REFMACphasing
Blu-Icedata collection
REFMACrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-02
    Type: Initial release