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ACTION OF STREPTOMYCIN ON V . CHOLERAE

Arora & Krishna Murti (1955) showed that broadspectrum antibiotics inhibit oxygen uptake by Vibrio cholerae cells in the presence of the tricarboxylic acid-cycle intermediates, but have no perceptible effect on the corresponding oxidations in animal-tissue homogenates. The availability of a V. cholerae strain sensitive to streptomycin and a resistant mutant derived from it has made it possible to extend this work, which was initiated originally with the object of elucidating the mechanism of action of antibiotics (Krishna Murti, 1959), to a more detailed evaluation of streptomycin inhibition. The results presented in this paper support our earlier findings and indicate that succinic dehydrogenase and fumarase are among the enzymes inhibited by streptomycin.