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3.A.1.20.5
Possibly a Mg2+-citrate uptake porter with three components, R, M and C, as suggested by Mandal et al. 2019.  However, this system appears more likely to be a ferric iron uptake system, based on sequence similarity studies (see other members of TC sub-family 3.A.1.20).

Accession Number:Q53VZ3
Protein Name:Putative iron ABC transporter, permease protein
Length:565
Molecular Weight:61034.00
Species:Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579) [300852]
Number of TMSs:12
Location1 / Topology2 / Orientation3: Cell membrane1 / Multi-pass membrane protein2
Substrate

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FASTA formatted sequence
1:	MVRKAPLAPS VPWPLALLTG AVGLLVLAPI GILVYQSLLT APFFAPAKRF ALEAYRYVLH 
61:	DPYFLEALKN SFLIGLGMVL IAVPLGSLFA FLVTKTDLPF ARLFELLLLA PIFISAIILG 
121:	IGFIVAFGPS GVVSGWVESL LGHVPWTIYT LPAIAVIAGL THVPYVYLYV ASTIQNVDAS 
181:	LEEAARVAGA RPYQVALSVT LPLVRPALVY SGALMLLLGF ELFGLPLVLG DAKGIMVVTT 
241:	YLYRLTAITG TSAYHLMAAV SVLIVLIAFT LVLLQRYLVG RMEGRYVAIG ARGYRTERLP 
301:	LGRLRYVWAF ALALYLLVAV VLPVLGVVFR SLVTSWGPGV DLREVFTVGH YADVFKLPNL 
361:	SRAVTNTLWV AALGGLLALA FYLLIALGIQ RGRGFGRVLD YLAGLPRAVP GLIMGLAFLW 
421:	IFLFFKPIAP WRNTLFALVL AYTVVWMPYG VRLLTAALLQ VGREVEEAAR IAGASPVRAF 
481:	LHGTLPLLKG GVLTAWFLLF IQFVREYSTG VYLMTAGTEV LGAQIVALWG TGAVDVIAAL 
541:	ATLQVLIVSG VFVLANRLGV RPQGL