1CUO

CRYSTAL STRUCTURE ANALYSIS OF ISOMER-2 AZURIN FROM METHYLOMONAS J


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.175 

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This is version 1.2 of the entry. See complete history

Literature

The significance of the flexible loop in the azurin (Az-iso2) from the obligate methylotroph Methylomonas sp. strain J.

Inoue, T.Suzuki, S.Nishio, N.Yamaguchi, K.Kataoka, K.Tobari, J.Yong, X.Hamanaka, S.Matsumura, H.Kai, Y.

(2003) J.Mol.Biol. 333: 117-124

  • Primary Citation of Related Structures:  1UAT

  • PubMed Abstract: 
  • The obligate methylotroph Methylomonas sp. strain J produces two azurins (Az-iso1 and Az-iso2) as candidates for electron acceptor from methylamine dehydrogenase (MADH) in the electron-transfer process involving the oxidation of methylamine to formal ...

    The obligate methylotroph Methylomonas sp. strain J produces two azurins (Az-iso1 and Az-iso2) as candidates for electron acceptor from methylamine dehydrogenase (MADH) in the electron-transfer process involving the oxidation of methylamine to formaldehyde and ammonia. The X-ray crystallographic study indicated that Az-iso2 gives two types of crystals (form I and form II) with polyethylene glycol (PEG4000) and ammonium sulfate as the precipitants, respectively. Comparison between the two Az-iso2 structures in forms I and II reveals the remarkable structural changes at the top surface of the molecule around the copper atom. Az-iso2 possesses Gly43 instead of Val43 or Ala43, which is unique among all other azurins around the copper ligand His46, inducing the remarkable structural change in the loop region from Gly37 to Gly43. When the structure of Az-iso2 is superimposed on that of amicyanin in the ternary complex composed of MADH, amicyanin, and cytochrome c(551), the loop of Az-iso2 deeply overlaps with the light subunit of MADH. However, the Az-iso2 molecule is probably able to avoid any steric hindrance with the cognate MADH to form the complex for intermolecular electron-transfer reaction, since the loop containing Gly43 is flexible. We discuss why the electron-transfer activity of Az-iso2 is fivefold higher than that of Az-iso1.


    Related Citations: 
    • Two distinct azurins function in the electron-transport chain of the obligate methylotroph Methylomonas J
      Ambler, R.P.,Tobari, J.
      (1989) Biochem.J. 261: 495
    • Crystallization and preliminary X-ray study of iso-2 azurin from the methylotrophic bacterium, Methylomonas J
      Inoue, T.,Nishio, N.,Kai, Y.,Suzuki, S.,Kataoka, K.
      (1999) Acta Crystallogr.,Sect.D 55: 307


    Organizational Affiliation

    Department of Materials Chemistry, Graduate School of Engineering, Osaka University, Suita 565-0871, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (AZURIN ISO-2)
A
129Methylomonas sp. (strain J)N/A
Find proteins for P12335 (Methylomonas sp. (strain J))
Go to UniProtKB:  P12335
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CU
Query on CU

Download SDF File 
Download CCD File 
A
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.175 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 32.960α = 90.00
b = 33.670β = 101.35
c = 47.340γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-08-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance