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- W1569067757 abstract "The major component of leucine uptake in Escherichia coli K-12 is a common system for l -leucine, l -isoleucine, and l -valine (LIV-I) with a Michaelis constant ( K m ) value of 0.2 μM (LIV-I system). The LIV-binding protein appears to be associated with this system. It now appears that the LIV-I transport system and LIV-binding protein also serve for the entry of l -alanine, l -threonine, and possibly l -serine. A minor component of l -leucine entry occurs by a leucine-specific system (L-system) for which a specific leucine-binding protein has been isolated. A mutant has been obtained that shows increased levels of the LIV-I transport activity and increased levels of both of the binding proteins. Another mutant has been isolated that shows only a major increase in the levels of the leucine-specific transport system and the leucine-specific binding protein. A third binding protein that binds all three branched-chain amino acids but binds isoleucine preferentially has been identified. The relationship of the binding proteins to each other and to transport activity is discussed. A second general transport system (LIV-II system) with a K m value of 2 μM and a relatively low V max can be observed in E. coli . The LIV-II system is not sensitive to osmotic shock treatment nor to growth of cells in the presence of leucine. This high K m system, which is specific for the branched-chain amino acids, can be observed in membrane vesicle preparations." @default.
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- W1569067757 date "1973-12-01" @default.
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- W1569067757 title "Multiplicity of Leucine Transport Systems in <i>Escherichia coli</i> K-12" @default.
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- W1569067757 doi "https://doi.org/10.1128/jb.116.3.1258-1266.1973" @default.
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