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3.D.1.1.1
NADH dehydrogenase I, NuoA-N.  NuoL probably comprises part of the proton pathway (Nakamaru-Ogiso et al. 2010).  NuoL (ND5), NuoM (ND4) and NuoN (ND2) are all homologous to proton:sodium antiporters and may all play reoles in pumping protons using a similar mechanism (Sato et al. 2013).

Accession Number:P0AFD6
Protein Name:NUOI aka B2281
Length:180
Molecular Weight:20538.00
Species:Escherichia coli [83333]
Location1 / Topology2 / Orientation3: Cell inner membrane1 / Peripheral membrane protein2
Substrate hydron

Cross database links:

DIP: DIP-35918N
RefSeq: AP_002879.1    NP_416784.1   
Entrez Gene ID: 946757   
Pfam: PF00037   
BioCyc: EcoCyc:NUOI-MONOMER    ECOL168927:B2281-MONOMER    MetaCyc:NUOI-MONOMER   
KEGG: ecj:JW2276    eco:b2281   

Gene Ontology

GO:0045272 C:plasma membrane respiratory chain complex I
GO:0051539 F:4 iron, 4 sulfur cluster binding
GO:0009055 F:electron carrier activity
GO:0005506 F:iron ion binding
GO:0050136 F:NADH dehydrogenase (quinone) activity
GO:0015453 F:oxidoreduction-driven active transmembrane ...
GO:0048038 F:quinone binding
GO:0009060 P:aerobic respiration
GO:0009061 P:anaerobic respiration
GO:0055114 P:oxidation reduction
GO:0019684 P:photosynthesis, light reaction

References (6)

[1] “The gene locus of the proton-translocating NADH: ubiquinone oxidoreductase in Escherichia coli. Organization of the 14 genes and relationship between the derived proteins and subunits of mitochondrial complex I.”  Weidner U.et.al.   7690854
[2] “Construction of a contiguous 874-kb sequence of the Escherichia coli-K12 genome corresponding to 50.0-68.8 min on the linkage map and analysis of its sequence features.”  Yamamoto Y.et.al.   9205837
[3] “The complete genome sequence of Escherichia coli K-12.”  Blattner F.R.et.al.   9278503
[4] “Highly accurate genome sequences of Escherichia coli K-12 strains MG1655 and W3110.”  Hayashi K.et.al.   16738553
[5] “Comparing the predicted and observed properties of proteins encoded in the genome of Escherichia coli K-12.”  Link A.J.et.al.   9298646
[6] “Isolation and characterization of the proton-translocating NADH: ubiquinone oxidoreductase from Escherichia coli.”  Leif H.et.al.   7607227

External Searches:

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MTLKELLVGF GTQVRSIWMI GLHAFAKRET RMYPEEPVYL PPRYRGRIVL TRDPDGEERC 
61:	VACNLCAVAC PVGCISLQKA ETKDGRWYPE FFRINFSRCI FCGLCEEACP TTAIQLTPDF 
121:	EMGEYKRQDL VYEKEDLLIS GPGKYPEYNF YRMAGMAIDG KDKGEAENEA KPIDVKSLLP