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3.A.1.14.23
Two components of a vitamin B12 (cobalamin) uptake porter, BtuCD.  BtuAB must exist but have not been identified (Deutschbauer et al. 2011). 

Accession Number:Q8EI20
Protein Name:ABC-type cobalamin uptake system ATPase component BtuD
Length:314
Molecular Weight:34264.00
Species:Shewanella oneidensis (strain MR-1) [211586]
Substrate

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MQPSTSTVTS TVAQPSAART HVGLNVSQDV ALNVSQLSWT IEGKTILSGV NFALQRGEML 
61:	GLIGPNGAGK SSLLRCLYRF IRPTQGQISL FSQDISQLSP KAFACKVAVV QQDTPHYFDM 
121:	TTEQLVAMGL TPHKGMFDSH SSGDSDKIIK ALEKVGLSHK LHQQYERLSG GEKQRALIAR 
181:	AIVQQPLLLI LDEPTNHLDV RYQIQILELV RSLGISVIAS IHDLNLASAL CDSLLLLDNG 
241:	QVSAMGTPTE VLTEERIAQV FGVCAQVMPH PQHANPLINY FYGYQKSYGY QKSKTDEEGA 
301:	IHPPHIINGV KTPS