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2.A.87.1.1
The riboflavin uptake transporter, RibU (may also transport roseoflavin and flavin mononucleotide (FMN)) (Burgess et al., 2006). Substrates noted above bind RibU with nM (Vitamin B2 with 0.6 nM) affinity with 1:1 stoichiometry; FAD does not bind (Duurkens et al., 2007).

Accession Number:Q1RN04
Protein Name:RibU
Length:206
Molecular Weight:22972.00
Species:Lactococcus lactis subsp. cremoris (Streptococcus cremoris) [1359]
Number of TMSs:6
Location1 / Topology2 / Orientation3: Plastid1 / Multi-pass membrane protein2
Substrate riboflavin

Cross database links:

References (1)

[1] “The riboflavin transporter RibU in Lactococcus lactis: molecular characterization of gene expression and the transport mechanism.”  Burgess C.M.et.al.   16585736

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MSKTRRMVLI AMLAALSTIL LLPILQFPLL PGIDFMKVEL SIIPVLIGVF TLGLGDGFII 
61:	LFIRSVLWYL LFNQGPSTWI GVPMNFVALG IFMAIVWFFT KKKFSIKNYT VGIVLATIAS 
121:	VLVMMVLNVF YALPLYRLAA GFDVDKIFAG ATHLFNMGSL SVTLNPTYLL TVVLPFNALQ 
181:	YIIFALVFGL IVTVFKKNKV VKFYNA