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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:Q9X1Z1
Protein Name:Energy-coupling factor transporter ATP-binding protein EcfA
Length:259
Molecular Weight:29376.00
Species:Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099) [243274]
Location1 / Topology2 / Orientation3: Cell inner membrane1 / Peripheral membrane protein2
Substrate biotin, riboflavin

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Structure:
4HLU   4ZIR     

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FASTA formatted sequence 
1:	MKITLNSVSF RYNGDYVLKD VNAEFETGKI YVVVGKNGSG KTTLLKILAG LLEAEGEIFL 
61:	DGSPADPFLL RKNVGYVFQN PSSQIIGATV EEDVAFSLEI MGLDESEMRK RIKKVLELVG 
121:	LSGLEKEDPL NLSGGQKQRL AIASMLARDT RFLALDEPVS MLDPPSQREI FQVLESLKNE 
181:	GKGIILVTHE LEYLDDMDFI LHISNGTIDF CGSWEEFVER EFDDVEIPFK WKLWKKCGKI 
241:	NLWEDRYENS GNQRRRDTV