Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 44.84 kDa 
• Atom Count: 3317 
• Residue Count: 396 
• Unique protein chains: 1

1N0J

The Structure of Human Mitochondrial MN3+ Superoxide Dismutase Reveals a Novel Tetrameric Interface of Two 4-Helix Bundles

• DOI: 10.2210/pdb1N0J/pdb
• Entry: 1N0J supersedes: 1ABM

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2002-10-14 Released: 2002-11-06 
• Deposition Author(s): Borgstahl, G.E.O., Parge, H.E., Tainer, J.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Work: 0.171 
• R-Value Observed: 0.171 

Literature

The Structure of Human Mitochondrial Mn3+ Superoxide Dismutase Reveals a Novel Tetrameric Interface of Two 4-Helix Bundles

Borgstahl, G.E., Parge, H.E., Hickey, M.J., Beyer Jr., W.F., Hallewell, R.A., Tainer, J.A.

(1992) Cell 71: 107-107

• PubMed: 1394426 
• DOI: 10.1016/0092-8674(92)90270-m
• Primary Citation of Related Structures:  
  1N0J


• PubMed Abstract: 
  

The 2.2 A resolution crystal structure of recombinant human manganese superoxide dismutase, a homotetrameric enzyme that protects mitochondria against oxygen-mediated free radical damage, has been determined. Within each subunit, both the N-terminal helical hairpin and C-terminal alpha/beta domains contribute ligands to the catalytic manganese site. Two identical 4-helix bundles, symmetrically assembled from the N-terminal helical hairpins, form novel tetrameric interfaces that stabilize the active sites. Structurally altered polymorphic variants with reduced activity, such as tetrameric interface mutant Ile-58 to Thr, may produce not only an early selective advantage, through enhanced cytotoxicity of tumor necrosis factor for virus-infected cells, but also detrimental effects from increased mitochondrial oxidative damage, contributing to degenerative conditions, including diabetes, aging, and Parkinson's and Alzheimer's diseases.

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Organizational Affiliation: 

Department of Molecular Biology, Scripps Research Institute, La Jolla, California 92037.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Superoxide dismutase [Mn]	A, B	199	Homo sapiens	Mutation(s): 0  Gene Names: SOD2 EC: 1.15.1.1
Find proteins for P04179 (Homo sapiens) Explore P04179  Go to UniProtKB:  P04179
NIH Common Fund Data Resources
PHAROS:  P04179 GTEx:  ENSG00000112096

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MN	A, B	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Work: 0.171 
• R-Value Observed: 0.171 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 76.13	α = 90
b = 79.9	β = 90
c = 68.05	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	refinement
X-GEN	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-10-14 
• Released Date: 2002-11-06 
Deposition Author(s): Borgstahl, G.E.O., Parge, H.E., Tainer, J.A.
• This entry supersedes: 1ABM

Revision History 

• Version 1.0: 2002-11-06
  Type: Initial release
  
• Version 1.1: 2007-10-16
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2017-10-11
  Changes: Derived calculations, Refinement description