ATP-binding cassette domain of branched-chain amino acid transporter
LivF (TM1139) is part of the LIV-I bacterial ABC-type two-component transport system that imports neutral, branched-chain amino acids. The E. coli branched-chain amino acid transporter comprises a heterodimer of ABC transporters (LivF and LivG), a heterodimer of six-helix TM domains (LivM and LivH), and one of two alternative soluble periplasmic substrate binding proteins (LivK or LivJ). ABC transporters are a large family of proteins involved in the transport of a wide variety of different compounds, like sugars, ions, peptides, and more complex organic molecules.
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