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- W2106940473 abstract "The mechanism of L-glutamate uptake was studied in Rhodobacter sphaeroides. Uptake of L-glutamate is mediated by a high-affinity (Kt of 1.2 microM), shock-sensitive transport system that is inhibited by vanadate and dependent on the internal pH. From the shock fluid, an L-glutamate-binding protein was isolated and purified. The protein binds L-glutamate (apparent Kd of 1.3 microM) and L-glutamine (Ki of 15 microM) with high affinity. The expression level of this binding protein is maximal at limiting concentrations of glutamine in the growth medium. The glutamate-binding protein restores the uptake of L-glutamate in spheroplasts. L-Aspartate is a strong competitive inhibitor of L-glutamate uptake (Ki of 3 microM) but competes only poorly with L-glutamate for binding to the binding protein (Ki of > 200 microM). The uptake of L-aspartate in R. sphaeroides also involves a binding protein which is distinct from the L-glutamate-binding protein. These data suggest that in R. sphaeroides, the L-glutamate- and L-aspartate-binding proteins interact with the same membrane transporter." @default.
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- W2106940473 date "1995-04-01" @default.
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- W2106940473 title "Characterization of a binding protein-dependent glutamate transport system of Rhodobacter sphaeroides" @default.
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- W2106940473 doi "https://doi.org/10.1128/jb.177.7.1812-1816.1995" @default.
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