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3.A.1.25.5
Biotin/Riboflavin ECF transport system, EcfAA'T/RibU/BioY (Karpowich and Wang 2013). RibU binds riboflavin with high affinity, and the protein-substrate complex is exceptionally stable in solution. The crystal structure of riboflavin-bound RibU reveals an electronegative binding pocket at the extracellular surface in which the substrate is completely buried (Karpowich et al. 2016).

Accession Number:Q9WZQ6
Protein Name:BioY protein
Length:169
Molecular Weight:18235.00
Species:Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099) [243274]
Number of TMSs:5
Substrate Biotin, riboflavin

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FASTA formatted sequence
1:	MRQLIKAGIF TALIVVGAWI SIPLGPVPFT LQVFFVFLSA YVLGKKYGTL AVATYVLLGA 
61:	MGLPVFANFK GGAQVLVGPT GGYLFGFILG AFVIGLLAEK KESFAWYLAS GVAGLGIIYA 
121:	LGVFVLNFYV HDIRKAISVG FVPFVWFDLI KLVVAALIAL RLKKLEVER