Abstract
L-Methionine-DL-sulfoximine, a glutamate analog known to inhibit glutamine synthetase (GS) and glutamate synthase (GOGAT), allowed nitrogenase biosynthesis by Frankia strain D11 in presence of NH4+. GS activity, detected in cell-free extracts of D11, was higher in N2-fixing than in nonfixing conditions. These facts suggested that nitrogenase biosynthesis in Frankia was probably regulated by GS, GOGAT, or a product of their reaction, but regulation of GS by an adenylylation–unadenylylation system was probably not involved. Similarities between Frankia and Anabaena cylindrica were stressed.
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