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  • Title: Germination of Bacillus cereus endospores: a proposed role for heat shock and nucleosides.
    Author: Yousten AA.
    Journal: Can J Microbiol; 1975 Aug; 21(8):1192-7. PubMed ID: 809124.
    Abstract:
    Spores of Bacillus cereus T prepared in a glucose - yeast extract - salts broth germinated in L-alanine or more rapidly in L-alanine plus inosine or adenosine. The nucleosides alone were not germinative. Inosine was shown to produce no pregerminative changes in spores that prepared them for more rapid germination later in L-alanine. Experiments which measured the interaction of nucleosides, heat shock, and D-alanine on germination rates suggested that nucleosides may potentiate L-alanine-induced germination by causing discrimination against D-alanine at the L-alanine binding site(s) in the spore. D-Alanine is germinative when used with inosine probably because of L-alanine formation by alanine racemase. Heat shock, a prerequisite to D-alanine plus inosine-induced germination, may facilitate entry of inosine into the spore in amounts needed to discriminate against D-alanine.
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