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We herein report thatAzorhizobium caulinodans PII and GlnK are not necessary for glutamine synthetase (GS) adenylylation whereas both proteins are required for complete GS deadenylylation. The disruption of bothglnB andglnK resulted in a high level of GS adenylylation under the condition of nitrogen fixation, leading to ammonium excretion in the free-living state. PII and GlnK also controllednif gene expression because NifA activatednifH transcription and nitrogenase activity was derepressed inglnB glnK double mutants, but not in wild-type bacteria, grown in the presence of ammonia.

Azorhizobium caulinodans P II and GlnK Proteins Control Nitrogen Fixation and Ammonia Assimilation

Azorhizobium caulinodans P _II and GlnK Proteins Control Nitrogen Fixation and Ammonia Assimilation