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2.A.125.1.1
The riboflavin (Km = 40μM) transporter, RFT1, SLC52A1 (Yonezawa et al. 2008).  The C-terminal 150 aas are 92% identical to porcine endogenous retrovirus A receptor 2 (PERV-A receptor 2) and 57% identical to the G-protein-coupled receptor 172A (XP_001519123).

Accession Number:B5MEV1
Protein Name:Riboflavin transporter 1
Length:448
Molecular Weight:46373.00
Species:Homo sapiens (Human) [9606]
Number of TMSs:11
Location1 / Topology2 / Orientation3: Cell outer membrane1 / Peripheral membrane protein2
Substrate riboflavin

Cross database links:

Pfam: PF06237   

Gene Ontology

GO:0004872 F:receptor activity

References (2)

[1] “Identification and functional characterization of a novel human and rat riboflavin transporter, RFT1.”  Yonezawa A.et.al.   18632736
[2] “The sequence of the human genome.”  Venter J.C.et.al.   11181995

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MAAPTLGRLV LTHLLVALFG MGSWAAVNGI WVELPVVVKD LPEGWSLPSY LSVVVALGNL 
61:	GLLVVTLWRR LAPGKGEQVP IQVVQVLSVV GTALLAPLWH HVAPVAGQLH SVAFLTLALV 
121:	LAMACCTSNV TFLPFLSHLP PPFLRSFFLG QGLSALLPCV LALVQGVGRL ECPPAPTNGT 
181:	SGPPLDFPER FPASTFFWAL TALLVTSAAA FRGLLLLLPS LPSVTTGGSG PELQLGSPGA 
241:	EEEEKEEEEA LPLQEPPSQA AGTIPGPDPE VHQLFSAHGA FLLGLMAFTS AVTNGVLPSV 
301:	QSFSCLPYGR LAYHLAVVLG SAANPLACFL AMGVLCRSLA GLVGLSLLGM LFGAYLMALA 
361:	ILSPCPPLVG TTAGVVLVVL SWVLCLCVFS YVKVAASSLL HGGGRPALLA AGVAIQVGSL 
421:	LGAGAMFPPT SIYHVFQSRK DCVDPCGP