1S3A image
Deposition Date 2004-01-13
Release Date 2005-01-25
Last Version Date 2024-10-30
Entry Detail
PDB ID:
1S3A
Keywords:
OXIDOREDUCTASE
Title:
NMR Solution Structure of Subunit B8 from Human NADH-Ubiquinone Oxidoreductase Complex I (CI-B8)
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Escherichia coli BL21
Method Details:
Experimental Method:
SOLUTION NMR
Conformers Calculated:
400
Conformers Submitted:
19
Selection Criteria:
structures with the lowest energy
1S3A validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:NADH-ubiquinone oxidoreductase B8 subunit
Gene (Uniprot):NDUFA2
Chain IDs:A
Chain Length:102
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:O43678 Pfam ID:PF05047
Ligand Molecules
NA
Primary Citation
The oxidized subunit B8 from human complex I adopts a thioredoxin fold.
Structure 12 1645 1654 (2004)
PMID: 15341729 DOI: 10.1016/j.str.2004.06.021

Abstact

Subunit B8 from ubiquinone oxidoreductase (complex I) (CI-B8) is one of several nuclear-encoded supernumerary subunits that are not present in bacterial complex I. Its solution structure shows a thioredoxin fold with highest similarities to the human thioredoxin mutant C73S and thioredoxin 2 from Anabeana sp. Interestingly, these proteins contain active sites in the same area, where the disulfide bond of oxidized CI-B8 is located. The redox potential of this disulfide bond is -251.6 mV, comparing well to that of disulfides in other thioredoxin-like proteins. Analysis of the structure reveals a surface area that is exclusively composed of highly conserved residues and thus most likely a subunit interaction site within complex I.

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Primary Citation of related structures
1S3A