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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:Q71WH8
Protein Name:Energy-coupling factor transporter ATP-binding protein EcfA2
Length:288
Molecular Weight:31957.00
Species:Listeria monocytogenes serotype 4b (strain F2365) [265669]
Location1 / Topology2 / Orientation3: Cell membrane1 / Peripheral membrane protein2
Substrate FMN, FAD, riboflavin

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FASTA formatted sequence
1:	MEIKLEQLGY CYQKNSPFEK RALLDVNVSF DSGSYSAIIG HTGSGKSTLL QHLNALLMPT 
61:	EGKITVGDRE IVAGVKQKKL RDLRKKVGIV FQFPEAQLFE ETVEKDICFG PMNFGVSEED 
121:	AKLRAKKVIY EVGLTEEILS RSPFELSGGQ MRRVAIAGVL AMDPEVLVLD EPTAGLDPHG 
181:	REEIMEMFYN LHKEKGLTTV LVTHSMEDAA RYAEKIVLMK AGTVLQIGTP REVFAKPDEL 
241:	VDLGLSVPDV VRFQGLFERK FDVKLTKTCL TIDELTTEMA PYLAKGGA