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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:Q53VZ2
Protein Name:Iron ABC transporter, periplasmic iron-binding protein
Length:358
Molecular Weight:39861.00
Species:Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579) [300852]
Substrate

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MRRAILWFVA LAIASVLAQQ SRPASDPQVV EAARKEGRLI IYSSTDQSSA QALLDDFRKL 
61:	YPFIQIEYND LGTQAIYDRF VSETAAGASS ADLLWSSAME LQVKLASEGY ALPYDSPEAK 
121:	NWPANARLGN LAYSTTLEPA VVVYNKRFLK PEEVPTTREG LARLLQEPRM RGRVATWDPE 
181:	RSAVGFTILK ADYDRFPAFQ ELARAFGKAQ AALYSSTGAA FEKVISGEHY LAYGFFGSYA 
241:	LLRQRTVKDL GIAYLTDGTV AIQRVAFINK RAAHPNAAKL FLDYLLSLRG QNLMAYTALI 
301:	FARRETVVGE ATPQALYKAV GGKDKVYAIP VSTEILKNLD PAERMRFLTF WRQAVRGQ