Abstract
Amino acid transport in amino acid auxotrophs of Thiobacillus thioparus was enhanced during growth on rate-limiting amino acid concentration. A pleiotropic mutation enhanced general amino acid transport as manifested by higher values of Vmax of amino acid transport. Affinity constants remained unaltered. Mutants with enhanced transport properties did not show changes in oxidation of thiosulfate, did not oxidize various organic compounds, and did not increase the heterotrophic potential of T. thioparus. The mutations for enhanced transport caused increased synthesis of amino acid transport system components. A method for genetic transformation of T. thioparus is described.
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