Table 2. Substrate specificity of MurT/GatD.
substrates | ||||
glutamine | NH3 | NH4Cl | glutamate/NH4Cl | |
enzymes | pH 7.5 | |||
MurT/GatD | + | − | − | − |
MurT/GatD_C94G | − | − | − | − |
GlnA+MurT/GatD | + | − | − | + |
pH 8.5 | ||||
MurT/GatD | + | + | + | nd* |
MurT/GatD_C94G | − | + | + | nd* |
*nd; not determined.
MurT/GatD and MurT/GatD_C94G catalyzed amidation of lipid II was analyzed in the presence of diverse putative nitrogen donor substrates at pH 7.5 and pH 8.5, respectively.