Figure 5From: A new suite of tnaA mutants suggests that Escherichia coli tryptophanase is regulated by intracellular sequestration and by occlusion of its active site D1D3 surface residues that affect polar localization of TnaA-sfGFP. A. Magenta: residues that were not mutagenized. Yellow: alanine substitution mutations that did not affect polar localization of D1D3 or TnaA. Deep blue: mutations that delayed assembly of TnaA foci (mutation sets A2-TnaA, A24-TnaA and A25-TnaA). Cyan: mutations that produced diffuse localization of the D1D3-sfGFP TnaA construct (A9-D1D3). Mutations that produced ovoid foci are not visible in this view and are illustrated in Figure 7. The interfaces between D1D31 and other subunits are illustrated in B to D. Note that mutations causing delayed focus disassembly at stationary phase (Table 3) are not illustrated.Back to article page