[The role of AmtB, GlnK and glutamine synthetase in regulation of transcription factor TnrA in Bacillus subtilis].

The nitrogen is a macroelement for all alive cells, from bacteria to animals. Although NH3/NH4+ are highly toxic to animal, they are the preferred source of nitrogen for the most microorganisms and are assimilated by glutamine synthetase in the GOGAT cycle. The nitrogen limitation triggers a number of regulatory processes and activates many genes, providing the utilizing of alternative nitrogen sources.