3LIO

X-ray structure of the iron superoxide dismutase from pseudoalteromonas haloplanktis (crystal form I)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and flexibility in cold-adapted iron superoxide dismutases: the case of the enzyme isolated from Pseudoalteromonas haloplanktis.

Merlino, A.Russo Krauss, I.Castellano, I.De Vendittis, E.Rossi, B.Conte, M.Vergara, A.Sica, F.

(2010) J.Struct.Biol. 172: 343-352

  • DOI: 10.1016/j.jsb.2010.08.008
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Superoxide dismutases (SODs) are metalloenzymes catalysing the dismutation of superoxide anion radicals into molecular oxygen and hydrogen peroxide. Here, we present the crystal structure of a cold-adapted Fe-SOD from the Antarctic eubacterium Pseudo ...

    Superoxide dismutases (SODs) are metalloenzymes catalysing the dismutation of superoxide anion radicals into molecular oxygen and hydrogen peroxide. Here, we present the crystal structure of a cold-adapted Fe-SOD from the Antarctic eubacterium Pseudoalteromonas haloplanktis (PhSOD), and that of its complex with sodium azide. The structures were compared with those of the corresponding homologues having a high sequence identity with PhSOD, such as the mesophilic SOD from Escherichia coli (EcSOD) or Pseudomonas ovalis, and the psychrophilic SOD from Aliivibrio salmonicida (AsSOD). These enzymes shared a large structural similarity, such as a conserved tertiary structure and arrangement of the two monomers, an almost identical total number of inter- and intramolecular hydrogen bonds and salt bridges. However, the two cold-adapted SODs showed an increased flexibility of the active site residues with respect to their mesophilic homologues. Structural information was combined with a characterisation of the chemical and thermal stability performed by CD and fluorescence measurements. Despite of its psychrophilic origin, the denaturation temperature of PhSOD was comparable with that of the mesophilic EcSOD, whereas AsSOD showed a lower denaturation temperature. On the contrary, the values of the denaturant concentration at the transition midpoint were in line with the psychrophilic/mesophilic origin of the proteins. These data provide additional support to the hypothesis that cold-adapted enzymes achieve efficient catalysis at low temperature, by increasing the flexibility of their active site; moreover, our results underline how fine structural modifications can alter enzyme flexibility and/or stability without compromising the overall structure of typical rigid enzymes, such as SODs.


    Related Citations: 
    • Crystallization and preliminary X-ray diffraction studies of a psychrophilic iron superoxide dismutase from Pseudolateromonas haloplanktis
      Merlino, A.,Russo Krauss, I.,Castellano, I.,De Vendittis, E.,Vergara, A.,Sica, F.
      (2008) Protein and Peptide letters 15: 415


    Organizational Affiliation

    Dipartimento di Chimica, Università di Napoli Federico II, Complesso Universitario Monte S. Angelo, Via Cinthia, I-80126 Naples, Italy.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
iron superoxide dismutase
A, B
192Pseudoalteromonas haloplanktis (strain TAC 125)Mutation(s): 0 
Gene Names: sodB
EC: 1.15.1.1
Find proteins for P84612 (Pseudoalteromonas haloplanktis (strain TAC 125))
Go to UniProtKB:  P84612
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
TRE
Query on TRE

Download SDF File 
Download CCD File 
A, B
TREHALOSE
ALPHA-D-GLUCOPYRANOSYL-ALPHA-D-GLUCOPYRANOSIDE
C12 H22 O11
HDTRYLNUVZCQOY-LIZSDCNHSA-N
 Ligand Interaction
FE
Query on FE

Download SDF File 
Download CCD File 
A, B
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.5 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.185 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 44.866α = 90.00
b = 103.714β = 108.63
c = 50.242γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
MAR345dtbdata collection
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-09-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance