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. 1981 Dec;148(3):956–965. doi: 10.1128/jb.148.3.956-965.1981

Active transport of amino acids in Thiobacillus thioparus is a low-affinity process.

A A Stark, S A Yankofsky
PMCID: PMC216298  PMID: 7309681

Abstract

A method for the isolation of amino acid auxotrophs of Thiobacillus thioparus is described. Characterization of a leucine auxotroph indicated that leucine biosynthesis in T. thioparus was not different from that of heterotrophic bacteria. T. thioparus cells accumulated amino acids via an active mechanism. Kt values of amino acid transport were between 15 and 330 microM, and Vmax values were 200 to 350 pmol min-1 mg of protein-1. Amino acid transport was carried out by a limited number of systems, each responsible for the uptake of several amino acids. Amino acid auxotrophs of T. thioparus exhibited transport and growth properties similar to those of transport-deficient mutants of heterotrophs which lost the high-affinity, but retained the low-affinity, amino acid transport systems.

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Selected References

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