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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:Q8Y456
Protein Name:Energy-coupling factor transporter transmembrane protein EcfT
Length:265
Molecular Weight:30176.00
Species:Listeria monocytogenes serovar 1/2a (strain ATCC BAA-679 / EGD-e) [169963]
Number of TMSs:5
Location1 / Topology2 / Orientation3: Cell membrane1 / Multi-pass membrane protein2
Substrate FMN, FAD, riboflavin

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FASTA formatted sequence
1:	MMDKMILGRY IPGNSWLHRI DPRAKITAVM AFIAIVFLAN NWLTYALMFV YVLYLVLTSK 
61:	VPFLFFIKGL QPIFWLILIT LLLQVFFTKG GTVLVDLGLL QITTLGLANG AMMFCRFVLI 
121:	IFMTTLLTLT TSPIELTDGL EKILAPFRLV HLPVHELALM LSISLRFIPT LMDETEKILK 
181:	AQKARGVEFT SGKWSDRIKA IIPLLVPLFI SAFKRAEDLA IAMEARGYRG GKGRTRFRLL 
241:	RWRFADTFLL ISLAVLSGLL FWLRS