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2.A.80.1.1
The tricarboxylate transporter, TctABC (Somers and Kay 1983; Winnen et al. 2003).  The high resolution structure of the receptor, TctC, is known (Sweet et al. 1984).

Accession Number:Q9FA45
Protein Name:TctB aka STM2787
Length:144
Molecular Weight:15972.00
Species:Salmonella enterica [90371]
Number of TMSs:4
Location1 / Topology2 / Orientation3: Cell membrane1 / Multi-pass membrane protein2
Substrate tricarboxylic acid trianion

Cross database links:

RefSeq: NP_461713.1   
Entrez Gene ID: 1254310   
BioCyc: STYP99287:STM2787-MONOMER   
KEGG: stm:STM2787   

References (1)

[1] “Complete genome sequence of Salmonella enterica serovar Typhimurium LT2.”  McClelland M.et.al.   11677609

External Searches:

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MMSDRIFAGI WLLLCIAGLF IAWQIQSEYS YEPVGPRPFP LGIIGLMALC ALALLLRHPD 
61:	TVSWPRRHVL QKLITMIIIL LMYAWGFEWL GFPIATALLT MVIGMLFGAT IPAAGISGAV 
121:	LGILLWYAFD RLLDVTLPLG AWLS