Summary
The growth of Thiobacillus neapolitanus strain C in liquid cultures was depressed by phenylalanine, p-fluorophenylalanine, cysteine, methionine, nor-leucine, azetidine-2-carboxylic acid, and chloramphenicol, but was little affected by glutamic acid, glycine, proline, azathymine, or oligomycin.
Growing cultures assimilated 14C-labelled glycine, glutamic acid, phenylalanine, and tyrosine into protein. Tyrosine and phenylalamine were incorporated unchanged, but glutamate was used also for synthesis of arginine and proline. Glycine-14C contributed also to adenine and guanine synthesis. The extremely large amounts of phenylalanine incorporated into protein could indicate its toxicity to depend on its producing abnormal protein synthesis. Azetidine-2-carboxylic acid appeared to lower the amount of proline in the protein.
Assimilation of glutamate and glycine by non-growing organisms was almost entirely dependent on energy from thiosulphate oxidation, thus suggesting a cause of obligate chemoautotrophy. Chloramphenicol specifically inhibited this thiosulphate-dependent incorporation of glutamate, glycine or CO2 into protein at concentrations which did not affect total CO2-fixation. Provided that energy is available from thiosulphate-oxidation this Thiobacillus is thus able to (a) activate exogenous amino acids; (b) incorporate them and CO2 into protein by a chloramphenicol sensitive mechanism; (c) synthesise proline and arginine from glutamate; or adenine and guanine from glycine. Its biosynthesis thus depends on mechanisms like those of heterotrophs but requires to be driven by a chemolithotrophic energy supply.
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Kelly, D.P. Influence of amino acids and organic antimetabolites on growth and biosynthesis of the chemoautotroph Thiobacillus neapolitanus strain C. Archiv. Mikrobiol. 56, 91–105 (1967). https://doi.org/10.1007/BF00408761
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DOI: https://doi.org/10.1007/BF00408761