1S3A | pdb_00001s3a

NMR Solution Structure of Subunit B8 from Human NADH-Ubiquinone Oxidoreductase Complex I (CI-B8)

• PDB DOI: https://doi.org/10.2210/pdb1S3A/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2004-01-13 Released: 2005-01-25 
• Deposition Author(s): Brockmann, C., Diehl, A., Rehbein, K., Kuhne, R., Oschkinat, H.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 400 
• Conformers Submitted: 19 
• Selection Criteria: structures with the lowest energy 

Literature

The oxidized subunit B8 from human complex I adopts a thioredoxin fold.

Brockmann, C., Diehl, A., Rehbein, K., Strauss, H., Schmieder, P., Korn, B., Kuhne, R., Oschkinat, H.

(2004) Structure 12: 1645-1654

• PubMed: 15341729 
• DOI: https://doi.org/10.1016/j.str.2004.06.021
• Primary Citation Related Structures: 
  1S3A


• PubMed Abstract: 
  

  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.

---

Organizational Affiliation: 
• Forschungsinstitut für Molekulare Pharmakologie, D-13125 Berlin, Germany.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 11.19 kDa 
• Atom Count: 681 
• Modeled Residue Count: 85 
• Deposited Residue Count: 102 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
NADH-ubiquinone oxidoreductase B8 subunit	A	102	Homo sapiens	Mutation(s): 0  Gene Names: NDUFA2 EC: 1.6.5.3 (PDB Primary Data), 1.6.99.3 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for O43678 (Homo sapiens) Explore O43678  Go to UniProtKB:  O43678
PHAROS:  O43678 GTEx:  ENSG00000131495

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 400 
• Conformers Submitted: 19 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Released Date: 2005-01-25 
Deposition Author(s): Brockmann, C., Diehl, A., Rehbein, K., Kuhne, R., Oschkinat, H.

Revision History  

• Version 1.0: 2005-01-25
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-03-02
  Changes: Data collection, Database references, Derived calculations
• Version 1.4: 2024-10-30
  Changes: Data collection, Structure summary