Abstract
Guanosine tetraphosphate (ppGpp) levels were followed in the non-sulfur purple bacterium Rhodopseudomonas palustris during derepression and repression of nitrogenase, and during nitrogen starvation which leads to overproduction of this enzyme. Conditions of nif gene activation were characterized by a rise in the ppGpp pool size ∼90 min prior to commencing nitrogenase activity, whereas the opposite conditions caused a rapid depletion of ppGpp. The kinetic behavior of this nucleotide was, thus, in accordance with a possible regulatory role in nif gene expression. The correlation of ppGpp synthesis and degradation with the nitrogen-nutritional status indicated existence of stringent control in this photosynthetic bacterium.
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