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The maltose ATP-binding cassette transporter of Salmonella typhimurium is composed of the soluble periplasmic receptor, MalE, and a membrane-associated complex comprising one copy each of the pore-forming hydrophobic subunits, MalF and MalG, and of a homodimer of the ATP-hydrolyzing subunit, MalK. During the transport process the subunits are thought to undergo conformational changes that might transiently...