the half-life of glutamine synthetase was more than 24 h , whereas that of nitrogenase ( reduced ferredoxin : dinitrogen oxidoreductase ( atp-hydrolysing ) , ec 1.18.2.1 ) was less than 4 h , suggesting that glutamine synthetase may not act as positive regulator of nitrogenase synthesis in anabaena .
C0030016
oxidoreductase
C0028174
nitrogenase