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  • 1
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The basis for the difference between strains 168 (d-tyrosine-sensitive) and 23 (d-tyrosine-resistant) of Bacillus subtilis at the molecular level is that of transport of d-tyrosine into the cell. Strain 23 does not incorporate significant amounts of d-tyrosine into whole cells. A mutant derivative was isolated from strain 23 which had an altered transport system permitting d-tyrosine uptake, a change which also led to inhibition of growth by d-tyrosine. Strain 168 is extremely sensitive to growth inhibition caused by low concentrations of the d-isomer of tyrosine. A mutant derivative of strain 168 selected for its d-tyrosine resistant phenotype had an altered transport system which no longer recognized the d-isomer of tyrosine. These mutants define at least one element of the tyrosine transport system in B. subtilis and provide a convenient phenotype for the eventual location of the chromosal map position.
    Type of Medium: Electronic Resource
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