Abstract
The biochemical parameters of glutamine synthetase [EC 6.3.1.2] from Klebsiella pneumoniae were characterized partially and the differential affinity of adenylylated and unadenylylated glutamine synthetase for adenosine diphosphate provides a convenient means of determining the adenylylation state. Using this assay procedure, the relationship between the adenylylation state and the expression of other genes involved in N2 assimilation was examined. No correlation between the adenylylation state and the expression of histidase, glutamine synthetase, glutamate synthase, glutamate dehydrogenase and urease was observed in aerobic cultures.