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  • Title: Relative levels of guanosine 5'-diphosphate 3'-diphosphate (ppGpp) in some N2 fixing bacteria during derepression and repression of nitrogenase.
    Author: Kleiner D, Phillips S.
    Journal: Arch Microbiol; 1981 Jan; 128(3):341-2. PubMed ID: 7011243.
    Abstract:
    Addition of ammonium to N2 fixing cultures of Azotobacter vinelandii, Klebsiella pneumoniae and Clostridium pasteurianum rapidly reduced the intracellular levels of guanosine 5'-diphosphate 3'-diphosphate (ppGpp) by 70-90%. This change might reflect a regulatory role of ppGpp in nitrogen metabolism.
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