1MG3

MUTATION OF ALPHA PHE55 OF METHYLAMINE DEHYDROGENASE ALTERS THE REORGANIZATION ENERGY AND ELECTRONIC COUPLING FOR ITS ELECTRON TRANSFER REACTION WITH AMICYANIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

MUTATION OF ALPHA PHE55 OF METHYLAMINE DEHYDROGENASE ALTERS THE REORGANIZATION ENERGY AND ELECTRONIC COUPLING FOR ITS ELECTRON TRANSFER REACTION WITH AMICYANIN

Sun, D.Chen, Z.W.Mathews, F.S.Davidson, V.L.

(2002) Biochemistry 41: 13926-13933

  • Primary Citation of Related Structures:  1MG2

  • PubMed Abstract: 
  • Methylamine dehydrogenase (MADH) possesses an alpha(2)beta(2) structure with each smaller beta subunit possessing a tryptophan tryptophylquinone (TTQ) prosthetic group. Phe55 of the alpha subunit is located where the substrate channel from the enzyme ...

    Methylamine dehydrogenase (MADH) possesses an alpha(2)beta(2) structure with each smaller beta subunit possessing a tryptophan tryptophylquinone (TTQ) prosthetic group. Phe55 of the alpha subunit is located where the substrate channel from the enzyme surface opens into the active site. Site-directed mutagenesis of alphaPhe55 has revealed roles for this residue in determining substrate specificity and binding monovalent cations at the active site. It is now shown that the alphaF55A mutation also increases the rate of the true electron transfer (ET) reaction from O-quinol MADH to amicyanin. The reorganization energy associated with the ET reaction is decreased from 2.3 to 1.8 eV. The electronic coupling associated with the ET reaction is decreased from 12 to 3 cm(-1). The crystal structure of alphaF55A MADH in complex with its electron acceptors, amicyanin and cytochrome c-551i, has been determined. Little difference in the overall structure is seen, relative to the native complex; however, there are significant changes in the solvent content of the active site and substrate channel. The crystal structure of alphaF55A MADH has also been determined with phenylhydrazine covalently bound to TTQ in the active site. Phenylhydrazine binding significantly perturbs the orientation of the TTQ rings relative to each other. The ET results are discussed in the context of the new and old crystal structures of the native and mutant enzymes.


    Related Citations: 
    • Structure of an electron transfer complex: methylamine dehydrogenase, amicyanin, and cytochrome c551i
      Chen, L.,Durley, R.,Mathews, F.S.,Davidson, V.L.
      (1994) Science 264: 86


    Organizational Affiliation

    Department of Biochemistry, The University of Mississippi Medical Center, Jackson, Mississippi 39216-4505, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Methylamine dehydrogenase, heavy chain
A, E, I, M
390Paracoccus denitrificansGene Names: mauB
EC: 1.4.9.1
Find proteins for P29894 (Paracoccus denitrificans)
Go to UniProtKB:  P29894
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Methylamine dehydrogenase, light chain
B, F, J, N
131Paracoccus denitrificansGene Names: mauA
EC: 1.4.9.1
Find proteins for P22619 (Paracoccus denitrificans)
Go to UniProtKB:  P22619
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Amicyanin
C, G, K, O
105Paracoccus denitrificansGene Names: mauC (ami)
Find proteins for P22364 (Paracoccus denitrificans)
Go to UniProtKB:  P22364
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
CYTOCHROME C-L
D, H, L, P
155Paracoccus denitrificansGene Names: moxG
Find proteins for P29899 (Paracoccus denitrificans)
Go to UniProtKB:  P29899
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A, B, E, F, I, J, M, O
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
NA
Query on NA

Download SDF File 
Download CCD File 
D, H, L, P
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
HEM
Query on HEM

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Download CCD File 
D, H, L, P
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
CU
Query on CU

Download SDF File 
Download CCD File 
C, G, K, O
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TRW
Query on TRW
B, F, J, N
L-PEPTIDE LINKINGC17 H18 N4 O2TRP
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 79.520α = 90.00
b = 188.372β = 98.84
c = 127.366γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-11
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-11
    Type: Refinement description