Decoding Allosteric Networks in Biocatalysts: Rational Approach to Therapies and Biotechnologies

Biocatalysts utilize allosteric mechanisms to control selectivity, catalytic activity, and the transport of reaction components. The allosteric control of catalysis has a high potential for the development of drugs and technologies. In particular, it opens the way to specific regulation of vital enzymes with conserved active sites. Using the central metabolic enzyme UDP-glucose pyrophosphorylase from the pathogen Leishmania major (LmUGP), we demonstrate how specific allosteric inhibition sites and their links to the catalytic center can be revealed rationally, through analysis of molecular interfaces along the enzymatic reaction cycle. Two previously unknown specific allosteric inhibition sites in LmUGP were rationally identified and experimentally verified. The molecular scaffold for allosteric inhibitor targeting the pathogen’s enzyme was developed. This led to the identification of murrayamine-I as an allosteric inhibitor that selectively blocks LmUGP. The presented approach opens up the possibility of using central metabolic enzymes with highly conserved active sites as allosteric drug targets, thus solving the cross-reactivity problem. In particular, it paves the ways to antimicrobial treatments

Total Syntheses of Murrayamine E, I, and K

We describe efficient synthetic routes to murrayamine A (mukoenine C), <i>O</i>-methylmurrayamine A, mahanine, <i>O</i>-methylmahanine, and murrayamine D and the first total syntheses of murrayamine E, I, and K. Key steps are a palladium-catalyzed construction of the carbazole framework and an annulation of the pyran ring, which is either catalyzed by phenylboronic acid or promoted by a Lewis acid