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2.A.23.1.6
The dicarboxylate (succinate, fumarate, malate and oxaloacetate):H+ symporter, DctA (probably 3H+ are transported per succinate taken up (Groeneveld et al., 2010).      

Accession Number:P96603
Protein Name:C4-dicarboxylate transport protein
Length:421
Molecular Weight:45441.00
Species:bacillus subtilis [1423]
Number of TMSs:10
Location1 / Topology2 / Orientation3: Cell membrane1 / Multi-pass membrane protein2
Substrate hydron, fumarate(2-), oxaloacetate(2-), malate(2-), succinate(2-)

Cross database links:

RefSeq: NP_388328.1   
Entrez Gene ID: 938223   
Pfam: PF00375   
KEGG: bsu:BSU04470   

Gene Ontology

GO:0016021 C:integral to membrane
GO:0005886 C:plasma membrane
GO:0017153 F:sodium:dicarboxylate symporter activity
GO:0008643 P:carbohydrate transport
GO:0006835 P:dicarboxylic acid transport

References (2)

[1] “The complete genome sequence of the Gram-positive bacterium Bacillus subtilis.”  Kunst F.et.al.   9384377
[2] “Regulation of the transport system for C4-dicarboxylic acids in Bacillus subtilis.”  Asai K.et.al.   10708364

External Searches:

Analyze:

Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MKLFKNLTVQ VITAVIIGVI VGLVWPDVGK EMKPLGDTFI NAVKMVIAPI IFFTIVLGIA 
61:	KMGDMKKVGK VGGKAFIYFE VVTTLALIIG LFVVNIMKPG AGLDYSKLEK GDVSQYTQNG 
121:	GQGIDWIEFI THIVPSNMVD AFAKGDILQV LFFSILFGVG LAALGEKGKS VIDFFDKVSH 
181:	VFFKIIGYIM RAAPIGAFGA MAYTIGHFGL DSIKPLASLM MSVYITMFLF VFVALNIICK 
241:	LYGFSLWNYL RFIKDELLIV LGTSSSESVL PRMMDKMERY GCSKSVVGLV IPTGYSFNLD 
301:	GTSIYLSMAT VFLAQVFGVD LSIGQQITII LVLMLTSKGA AGVTGSGFIV LASTLSALQV 
361:	IPLEGLALLL GVDRFMSEGR AIVNLIGNGI ATIIVAKSEN EFDEAKSIEA VEGMKKMKTA 
421:	V