Paul pneumoniae Klebsiella Regulatory System in Reductase-Activating Glycohydrolase Dinitrogenase − Transferase Dinitrogenase Reductase ADP-Ribosyl Rhodospirillum rubrum Expression of the Dinitrogenase Reductase by Heterologous Reversible ADP-Ribosylation of and Its Homolog GlnK onIIEffect of P