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UniProtKB/Swiss-Prot entry Q56218


[Entry info] [Name and origin] [References] [Comments] [Cross-references] [Keywords] [Features] [Sequence] [Tools]

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Entry information
Entry name NQO6_THET8
Primary accession number Q56218
Secondary accession number Q5SM58
Integrated into Swiss-Prot on November 1, 1997
Sequence was last modified on January 23, 2007 (Sequence version 3)
Annotations were last modified on    September 2, 2008 (Entry version 57)
Name and origin of the protein
Protein name NADH-quinone oxidoreductase subunit 6
Synonyms EC 1.6.99.5
NADH dehydrogenase I chain 6
NDH-1 subunit 6
Gene name
Name: nqo6
OrderedLocusNames: TTHA0085
From
Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579) [TaxID: 300852] [HAMAP proteome]
Taxonomy Bacteria; Deinococcus-Thermus; Deinococci; Thermales; Thermaceae; Thermus.
Protein existence 1: Evidence at protein level;
References
[1]
NUCLEOTIDE SEQUENCE [GENOMIC DNA].
DOI=10.1074/jbc.272.7.4201; PubMed=9020134 [NCBI, ExPASy, EBI, Israel, Japan]
Yano T., Chu S.S., Sled' V.D., Ohnishi T., Yagi T.;
"The proton-translocating NADH-quinone oxidoreductase (NDH-1) of thermophilic bacterium Thermus thermophilus HB-8. Complete DNA sequence of the gene cluster and thermostable properties of the expressed NQO2 subunit.";
J. Biol. Chem. 272:4201-4211(1997).
[2]
NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
Masui R., Kurokawa K., Nakagawa N., Tokunaga F., Koyama Y., Shibata T., Oshima T., Yokoyama S., Yasunaga T., Kuramitsu S.;
"Complete genome sequence of Thermus thermophilus HB8.";
Submitted (NOV-2004) to the EMBL/GenBank/DDBJ databases.
[3]
PROTEIN SEQUENCE OF 2-9, IDENTIFICATION BY MASS SPECTROMETRY, EPR SPECTROSCOPY, AND SUBUNIT.
DOI=10.1021/bi0600998; PubMed=16584177 [NCBI, ExPASy, EBI, Israel, Japan]
Hinchliffe P., Carroll J., Sazanov L.A.;
"Identification of a novel subunit of respiratory complex I from Thermus thermophilus.";
Biochemistry 45:4413-4420(2006).
[4]
X-RAY CRYSTALLOGRAPHY (3.3 ANGSTROMS), SUBUNIT, AND ELECTRON TRANSFER MECHANISM.
DOI=10.1126/science.1123809; PubMed=16469879 [NCBI, ExPASy, EBI, Israel, Japan]
Sazanov L.A., Hinchliffe P.;
"Structure of the hydrophilic domain of respiratory complex I from Thermus thermophilus.";
Science 311:1430-1436(2006).
Comments
  • FUNCTION: NDH-1 shuttles electrons from NADH, via FMN and iron-sulfur (Fe-S) centers, to quinones in the respiratory chain. The immediate electron acceptor for the enzyme in this species is menaquinone. Couples the redox reaction to proton translocation (for every two electrons transferred, four hydrogen ions are translocated across the cytoplasmic membrane), and thus conserves the redox energy in a proton gradient required for the synthesis of ATP.
  • CATALYTIC ACTIVITY: NADH + quinone = NAD+ + quinol.
  • COFACTOR: Binds 1 4Fe-4S cluster per subunit. This 4Fe-4S cluster is referred to as N2.
  • SUBUNIT: NDH-1 is composed of 15 different subunits, nqo1 to nqo15. The complex has a L-shaped structure, with the hydrophobic arm (subunits nqo7, nqo8 and nqo10 to nqo14) embedded in the membrane and the hydrophilic peripheral arm (subunits nqo1 to nqo6, nqo9 and nqo15) protruding into the bacterial cytoplasm. The hydrophilic domain contains all the redox centers. Subunit nqo6 interacts extensively with nqo4.
  • SUBCELLULAR LOCATION: Cell membrane; Peripheral membrane protein; Cytoplasmic side.
  • SIMILARITY: Belongs to the complex I 20 kDa subunit family.
Copyright
Copyrighted by the UniProt Consortium, see http://www.uniprot.org/terms. Distributed under the Creative Commons Attribution-NoDerivs License.
Cross-references
Sequence databases
EMBL
U52917; AAA97939.1; -; Genomic_DNA.[EMBL / GenBank / DDBJ] [CoDingSequence]
AP008226; BAD69908.1; -; Genomic_DNA.[EMBL / GenBank / DDBJ] [CoDingSequence]
PIR T11899; T11899.
RefSeq YP_143351.1; -.
3D structure databases
PDB
2FUG; X-ray; 3.30 A; 6/F/O/X=1-181.[ExPASy / RCSB / EBI]
PDBsum 2FUG; -.
ModBase Q56218.
Enzyme and pathway databases
BioCyc TTHE300852:TTHA0085-MON; -.
Family and domain databases
InterPro IPR006138; NADH_DHase_20kDa_su.
IPR014406; NiFe_hyd_3_ssu/Q_oxred_NuoB.
IPR006137; OxRdtase_q6.
Graphical view of domain structure.
PANTHER PTHR11995:SF2; NADH_DH_20kDa; 1.
PTHR11995; NiFe_hyd_3_ssu/Q_oxred_NuoB; 1.
Pfam PF01058; Oxidored_q6; 1.
Pfam graphical view of domain structure.
TIGRFAMs TIGR01957; nuoB_fam; 1.
PROSITE PS01150; COMPLEX1_20K; 1.
BLOCKS Q56218.
Genome annotation databases
GeneID 3168381; -.
GenomeReviews AP008226_GR; TTHA0085.
KEGG ttj:TTHA0085; -.
Phylogenomic databases
HOGENOM Q56218; -.
Genome annotation databases
CMR Q56218; TTHA0085.
Other
ProtoNet Q56218.
UniRef View cluster of proteins with at least 50% / 90% / 100% identity.
Keywords
3D-structure; 4Fe-4S; Cell membrane; Complete proteome; Direct protein sequencing; Iron; Iron-sulfur; Membrane; Metal-binding; NAD; Oxidoreductase; Quinone.
Features
SEVIEWER logo Feature table viewer
KeyFrom   To Length Description FTId
INIT_MET   1     1        Removed. 
CHAIN   2   181  180     NADH-quinone oxidoreductase subunit 6. PRO_0000118763
METAL   45    45        Iron-sulfur (4Fe-4S). 
METAL   46    46        Iron-sulfur (4Fe-4S). 
METAL   111   111        Iron-sulfur (4Fe-4S). 
METAL   140   140        Iron-sulfur (4Fe-4S). 
HELIX   19    34  16      
HELIX   45    49  5      
HELIX   51    53  3      
STRAND   78    82  5      
TURN   86    88  3      
HELIX   89    97  9      
STRAND   105   108  4      
HELIX   109   113  5      
HELIX   127   129  3      
STRAND   134   137  4      
HELIX   144   159  16      
STRAND   165   167  3      
Sequence information
Length: 181 AA [This is the length of the unprocessed precursor] Molecular weight: 20239 Da [This is the MW of the unprocessed precursor] CRC64: A1E030366E6692F1 [This is a checksum on the sequence]
        10         20         30         40         50         60 
MALKDLFERD VQELEREGIL FTTLEKLVAW GRSNSLWPAT FGLACCAIEM MASTDARNDL 

        70         80         90        100        110        120 
ARFGSEVFRA SPRQADVMIV AGRLSKKMAP VMRRVWEQMP DPKWVISMGA CASSGGMFNN 

       130        140        150        160        170        180 
YAIVQNVDSV VPVDVYVPGC PPRPEALIYA VMQLQKKVRG QAYNERGERL PPVAAWKRTR 


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Q56218 in FASTA format

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