Substrate Specificity and Chemical Mechanism for the Reaction Catalyzed by Glutamine Kinase
作者:Zane W. Taylor、Alexandra R. Chamberlain、Frank M. Raushel
DOI:10.1021/acs.biochem.8b00811
日期:2018.9.18
through a three-step reaction mechanism via the formation of covalent pyrophosphorylated (Enz-X-Pβ-Pγ) and phosphorylated (Enz-X-Pβ) intermediates. In the absence of l-glutamine, the enzyme was shown to catalyze a positional isotope exchange (PIX) reaction within β-[18O4]-ATP in support of the formation of the Enz-X-Pβ-Pγintermediate. In the absence of ATP, the enzyme was shown to catalyze a molecular isotope