The treatment of trialkyl phosphate with different alkyl bromides provides facile access to mixed phosphate esters. The presence of substoichiometric amounts of lithium bromide was found to be critical to this transesterification process, supporting a mechanism involving initial generation of phosphate anion, followed by its nucleophilic attack on alkyl bromide.
A new series of l-glutamic acid p-nitroanilide analogues has been synthesized and tested as substrates and inhibitors of rat kidney γ-glutamyltranspeptidase (GGT). Kinetic parameters (K m and k cat ) were determined for each analogue and provide insight into the scope and limits of GGT catalytic efficiency.
The enzyme γ-glutamyl transpeptidase (GGT), implicated in many physiological processes, catalyses the transfer of a γ-glutamyl from a donor substrate to an acyl acceptor substrate, usually an amino acid or a peptide. In order to investigate which moieties of the donor substrate are necessary for recognition by GGT, the structure of the well-recognized substrate l-γ-glutamyl-p-nitroanilide was modified...
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