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Regulatory aspects of inorganic nitrogen metabolism in the Rhodospirillaceae

✍ Scribed by Kassem Alef; Diethelm Kleiner

Publisher: Springer
Year: 1982
Tongue: English
Weight: 295 KB
Volume: 133
Category: Article
ISSN: 0302-8933
DOI: 10.1007/bf00415009

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✦ Synopsis

Regulatory aspects of the assimilation of inorganic nitrogen compounds (ammonia, nitrate, nitrogen) were studied in 12 strains belonging to the Rhodospirillaceae. All strains possessed an ammonium transport system, as demonstrated by ~4C-methylammonium uptake. This uptake showed saturation kinetics (Kin between 50-1501aM), and was competitively inhibited by ammonium (Ki between 5-18 ~tM), The ammonium transport systems were repressed by ammonium in the growth medium. The nitrogenase activity of all strains was reversibly inhibited by ammonium ("switchoff"). This effect was not shown under nitrogen starvation conditions with the exception of some strains of Rhodopseudomonas capsulata, the nitrogenase of which was always susceptible to switch-off by ammonium. Assimilation of nitrate was confined to some strains of Rhodopseudomonas capsulata.

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