Molecular Mechanisms of Enzyme Inhibition by Emerging Chemical Compounds

Abstract

Enzyme inhibition is one of the most productive strategies in drug discovery, agrochemistry and chemical biology, and it is being reshaped by new classes of chemical compounds that act through unconventional mechanisms. This article reviews the molecular principles by which small molecules suppress enzyme activity and examines how emerging compounds extend these principles. Classical reversible modes, including competitive, noncompetitive and uncompetitive inhibition, are described together with irreversible and covalent mechanisms, allosteric modulation and time-dependent binding. Newer chemotypes such as targeted covalent inhibitors, fragment-derived leads, macrocycles and degrader molecules that remove enzymes rather than merely blocking them are then discussed. Structural, biophysical and computational methods used to decipher binding mechanisms are summarized, and the challenges of resistance, selectivity and toxicity are considered. The review argues that a detailed mechanistic understanding, rather than potency alone, should guide the design and optimization of next-generation inhibitors.