Regulation of Nitrogenase Synthesis by Oxygen in Klebsiella pneumoniae
AUTOR(ES)
St. John, Richard T.
RESUMO
Klebsiella pneumoniae does not fix N2 under aerobic conditions. The two protein components required for nitrogenase activity were studied during aeration of cells in nitrogen-free media. Component II of nitrogenase was inactivated more slowly in vivo than component I during aeration. The rate of loss of component II was less than the rate of component II synthesis during derepression. No inactive components were detected in cells that had been growing on NH4+ and then aerated in nitrogen-free medium. This supports the hypothesis that O2 somehow represses the formation of nitrogenase.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=245598Documentos Relacionados
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