2IAA

Crystal Structure of an Electron Transfer Complex Between Aromatic Amine Dephydrogenase and Azurin from Alcaligenes Faecalis (Form 2)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.174 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of an Electron Transfer Complex between Aromatic Amine Dehydrogenase and Azurin from Alcaligenes faecalis.

Sukumar, N.Chen, Z.Ferrari, D.Merli, A.Rossi, G.L.Bellamy, H.D.Chistoserdov, A.Davidson, V.L.Mathews, F.S.

(2006) Biochemistry 45: 13500-13510

  • DOI: 10.1021/bi0612972
  • Primary Citation of Related Structures:  2H3X, 2H47

  • PubMed Abstract: 
  • The crystal structure of an electron transfer complex of aromatic amine dehydrogenase (AADH) and azurin is presented. Electrons are transferred from the tryptophan tryptophylquinone (TTQ) cofactor of AADH to the type I copper of the cupredoxin azurin ...

    The crystal structure of an electron transfer complex of aromatic amine dehydrogenase (AADH) and azurin is presented. Electrons are transferred from the tryptophan tryptophylquinone (TTQ) cofactor of AADH to the type I copper of the cupredoxin azurin. This structure is compared with the complex of the TTQ-containing methylamine dehydrogenase (MADH) and the cupredoxin amicyanin. Despite significant similarities between the two quinoproteins and the two cupredoxins, each is specific for its respective partner and the ionic strength dependence and magnitude of the binding constant for each complex are quite different. The AADH-azurin interface is largely hydrophobic, covering approximately 500 A(2) of surface on each molecule, with one direct hydrogen bond linking them. The closest distance from TTQ to copper is 12.6 A compared with a distance of 9.3 A in the MADH-amicyanin complex. When the MADH-amicyanin complex is aligned with the AADH-azurin complex, the amicyanin lies on top of the azurin but is oriented quite differently. Although the copper atoms differ in position by approximately 4.7 A, the amicyanin bound to MADH appears to be rotated approximately 90 degrees from its aligned position with azurin. Comparison of the structures of the two complexes identifies features of the interface that dictate the specificity of the protein-protein interaction and determine the rate of interprotein electron transfer.


    Related Citations: 
    • Atomic Description of an Enzyme Reaction Dominated by Proton Tunneling
      Masgrau, L.,Roujeinikova, A.,Johannissen, L.O.,Hothi, P.,Basran, J.,Ranaghan, K.E.,Mulholland, A.J.,Sutcliffe, M.J.,Scrutton, N.S.,Leys, D.
      (2006) Science 312: 237


    Organizational Affiliation

    Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 65211, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aromatic Amine Dehydrogenase
A, D
390Alcaligenes faecalisGene Names: aauB
EC: 1.4.9.2
Find proteins for P84888 (Alcaligenes faecalis)
Go to UniProtKB:  P84888
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Aromatic Amine Dehydrogenase
B, E
135Alcaligenes faecalisGene Names: aauA
EC: 1.4.9.2
Find proteins for P84887 (Alcaligenes faecalis)
Go to UniProtKB:  P84887
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Azurin
C
128Alcaligenes faecalisN/A
Find proteins for P00281 (Alcaligenes faecalis)
Go to UniProtKB:  P00281
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CU
Query on CU

Download SDF File 
Download CCD File 
C
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TRQ
Query on TRQ
B, E
L-PEPTIDE LINKINGC11 H10 N2 O4TRP
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.205 
  • R-Value Work: 0.174 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 67.216α = 90.00
b = 131.722β = 90.00
c = 133.204γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
HKL-2000data collection
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-11-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance