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ABC transporter permease subunit
The alignments cover the most conserved region of the proteins, which is thought to be located in a cytoplasmic loop between two transmembrane domains. The members of this family have a variable number of transmembrane helices. (from Pfam)
spermidine/putrescine ABC transporter permease PotB
spermidine/putrescine ABC transporter permease PotB is a transmembrane (TM) subunit of the periplasmic binding protein (PBP)-dependent ATP-binding cassette (ABC) transporter PotABCD that is responsible for the translocation across the membrane of putrescine and spermidine
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