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NADH-ubiquinone oxidoreductase 20 kDa subunit

Solanum tuberosum (Potato)
Reviewed-Annotation score: Annotation score: 2 out of 5-Experimental evidence at protein leveli


Transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone.

Catalytic activityi

NADH + ubiquinone + 5 H+(In) = NAD+ + ubiquinol + 4 H+(Out).
NADH + acceptor = NAD+ + reduced acceptor.

GO - Molecular functioni


Molecular functionOxidoreductase
LigandNAD, Ubiquinone

Names & Taxonomyi

Protein namesi
Recommended name:
NADH-ubiquinone oxidoreductase 20 kDa subunit (EC:, EC:
Alternative name(s):
Complex I-20kD
Short name:
OrganismiSolanum tuberosum (Potato)
Taxonomic identifieri4113 [NCBI]
Taxonomic lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliophytaeudicotyledonsGunneridaePentapetalaeasteridslamiidsSolanalesSolanaceaeSolanoideaeSolaneaeSolanum
  • UP000011115 Componenti: Unassembled WGS sequence

Subcellular locationi

GO - Cellular componenti

Keywords - Cellular componenti

Membrane, Mitochondrion, Mitochondrion inner membrane

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001188511 – ›15NADH-ubiquinone oxidoreductase 20 kDa subunitAdd BLAST›15


Subunit structurei

Complex I is composed of about 45 different subunits.By similarity


Sequence statusi: Fragment.

Mass (Da):1,573
Last modified:February 1, 1994 - v1

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Non-terminal residuei151

Sequence databases


Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.

Entry informationi

Entry nameiNUO3_SOLTU
AccessioniPrimary (citable) accession number: P80263
Entry historyiIntegrated into UniProtKB/Swiss-Prot: February 1, 1994
Last sequence update: February 1, 1994
Last modified: June 24, 2015
This is version 59 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program


Keywords - Technical termi

Complete proteome, Direct protein sequencing, Reference proteome