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3.A.1.2.28
Riboflavin uptake ABC transporter, RfuABCD.  The periplasmic binding protein (RfuA) has been crystallized at 1.3 Å resolution with riboflavin bound (Deka et al. 2013). Similar systems are found in other spirochetes such as Treponema denticola, and Borrelia burgdorferi (Deka et al. 2013).

Accession Number:R9USS2
Protein Name:Sugar ABC superfamily ATP binding cassette transporter, ABC protein
Length:586
Molecular Weight:64410.00
Species:Treponema pallidum (strain Nichols) [243276]
Number of TMSs:3
Substrate riboflavin

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MMIAERGVRA SARGVLSLHH IGKTYPRVMP RSKRGVWGMF GHPGRRAVDD AHTAHGPCSG 
61:	ARETDAAEHS VLSDVNLSFF TGEIHALLGK NGAGKSTLAH ILSGFCVPTH GQLRLDGKEQ 
121:	RFSVPFDALR AGIGIVHQQP VFAERATVFE NVVMGSAALT GVRWVRRAQV RERIDRIIAQ 
181:	WRMPLKKEEY VACLSADKRF FVSLLCVLFR NPRFIILDEP RCAPAQSRAV FFSHLEEFFV 
241:	RSSHAPRCGG GVIVVTHRFA DALRWAQRIS LIEGGKACSF LRTDLLDEYC SAHQVNECIQ 
301:	KVSCALMSAS TVTSSAVSSF SSLSDTQSCA TVPRTSSARP WVLRVESLQV SKHADVPLTD 
361:	ISFSVAASAI IGIVGTPEDG VHVLEDILCD MHAGASRTHC TGNILLQEHD QVWCLPLQRN 
421:	TPSLLRAHGV ACVPSNCIQR GASMQLTLFD LLVPYTLRTW RTRVRAQMRF VARLLAEEEI 
481:	YCDPLQPACT LSGGQLQRVI LARELATRPR LLILAEPAEG LDSASEQRLL ARLRQVAQAG 
541:	TALVLLAREQ HQAQWRALCT ERFLLRAGTL CAEVSGTPSP SQDSHT