Báo cáo khoa học: The pivotal regulator GlnB of Escherichia coli is engaged in subtle and context-dependent control
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This study tests the purported signal amplification capability of the gluta-mine synthetase (GS) regulatory cascade inEscherichia coli. Intracellular concentrations of the pivotal regulatory protein GlnB were modulated by varying expression of its gene (glnB). Neither glnBexpression nor PII * (i.e. the sum of the concentration of the P II-like proteins GlnB and GlnK) had control over the steady-state adenylylation level of GS when cells were grown in the presence of ammonia
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