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Abilities of glutamine and MetSox to promote the GS-mediated inhibition of TnrA DNA binding. A gel mobility shift assay was used to examine the binding of TnrA to amtB promoter DNA. The binding reaction mixtures contained TnrA (100 nM), GS (1 μM), glutamine (20 mM), and MetSox (20 mM), as indicated above the autoradiograph. ATP is not present in these binding mixtures, and thus MetSox is not phosphorylated.
