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3.A.1.25.8
An ECF ABC transporter with 4 subunits, EcfS/EcfT/EcfA/EcfA'.  EcfS is also called RibU; EcfT is also called CbiQ, EcfA is also called Cbi01, and EcfA' is also called Cbi02.  This system can take up riboflavin and possibly other vitamins (Karpowich et al. 2015). ATP binding to the EcfAA' ATPases drives a conformational change that dissociates the S subunit from the EcfAA'T ECF module. Upon release from the ECF module, the RibU S subunit then binds the riboflavin transport substrate.  S subunits for distinct substrates compete for the ATP-bound state of the ECF module (Karpowich et al. 2015). RibU appears to be capable of exporting riboflavin, FMN and FAD (Light et al. 2018).

Accession Number:Q8Y5W0
Protein Name:Riboflavin transporter
Length:203
Molecular Weight:22654.00
Species:Listeria monocytogenes serovar 1/2a (strain ATCC BAA-679 / EGD-e) [169963]
Number of TMSs:5
Location1 / Topology2 / Orientation3: Cell membrane1
Substrate FMN, FAD, riboflavin

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FASTA formatted sequence
1:	MKNYSMKVFV SVAVLGTLAF ILMMLQFPLL PSAPFLKLDF SDIPALIGGL LFGPLAVILV 
61:	ELIKNVLLYI VSGSPVGVPV GELANFISGL FYVLPIYYLF HWLRSTKGMV LSTAVGTVLM 
121:	TGAMAVFNYF VLLPFYIKLG GLPANTDVAW LITYAIVPFN LLKGVIVSAV FLLLYSRLKK 
181:	WIAKNQTMKE RRKFEKRQQE ISH