Figure 6From: Molecular basis for the distinct divalent cation requirement in the uridylylation of the signal transduction proteins GlnJ and GlnB from Rhodospirillum rubrumAnalysis of PII protein function in the activation of GlnE.(A) Model representing the role of PII proteins in the regulation of GS activity, through GlnE in R. rubrum . (B) Glutamine synthetase activity after 30 minutes of incubation with GlnE and PII proteins (as indicated). Results are the average of three experiments and are shown as mean ± SD.Back to article page