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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:Q9X2I1
Protein Name:ABC-type transporter, integral membrane subunit
Length:271
Molecular Weight:30641.00
Species:Thermotoga maritima (strain ATCC 43589 / MSB8 / DSM 3109 / JCM 10099) [243274]
Number of TMSs:6
Substrate Biotin, riboflavin

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FASTA formatted sequence
1:	MRLPTVLIGR YIPVDSIVHR LDPRAKLLGM IFLISAVLIV PNLLFYLVPG LAIFLLMFLS 
61:	RTGFKIYLAG LRSLWFFLVF AVLVQFFSSS EGEKIFWMIT DRAIWSAVYI MLRLVLIILL 
121:	AENFSATTPP LLSARAIESI FSTFGARKIG HEIGMVMTIA MRFVPVLALE ADRILKAQIA 
181:	RGANFERGKF FDRIRALVVI IVPLLISALR KAEELAVAME ARLYTGEPPK TRFKDIKWKP 
241:	MDTLYVLLTA GVLVLVLFGR YFVDGVFQYG S