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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:Q9FA44
Protein Name:TctA
Length:504
Molecular Weight:52753.00
Species:Salmonella enterica [28901]
Number of TMSs:13
Location1 / Topology2 / Orientation3: Cell membrane1 / Multi-pass membrane protein2
Substrate tricarboxylic acid trianion

Cross database links:

Pfam: PF01970   

References (2)

[1] “Fluorescence-based isolation of bacterial genes expressed within host cells.”  Valdivia R.H.et.al.   9302299
[2] “mig-14 is a horizontally acquired, host-induced gene required for Salmonella enterica lethal infection in the murine model of typhoid fever.”  Valdivia R.H.et.al.   11083839

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MDTWIYLSQG FAVAMTPENL VIALIGCFVG TIVGLLPGLG PINGVAILLP LAFALHLPAE 
61:	SALILLATVY IGCEYGGRIS SILLNVPGDA AAIMTALDGY PMAQQGKGGV ALSISAVSSF 
121:	FGSLIAIGGI ILFAPLLAQW SLAFGPAEYF ALMVFAIACL GSMMAQNPLK SFLAALIGLG 
181:	LATVGVDANT GVYRFTFDSV HLSDGVQFIV VVIGLFSVSE ILLMLEHTSS GQTMVRKTGR 
241:	MLFNLKEGAQ CIGTTLRSSV IGFFVGVLPG AGATIASAIT YMTEKKLSGN SDSFGKGDIR 
301:	GVAAPEAANN ASACGSFIPM LTLGVPGSGT TAVMMGALTL YNITPGPAMF TEQPDIVWGL 
361:	IAALLIANVM LLIMNIPLIG LFTRMLTIPL WFVVPAIAAV SAVGVYAVHS TTFDLVLMVA 
421:	LGVLGYILRK MHFPMSPLIL GFVLGEMLEQ NLRRALSISN GNMAILWQSG VAKALLIMAI 
481:	MVIVVPPVLR LLRKHSRKPQ VDAG