Peptidase and hydrolase enzyme orthosteric active sites

The orthosteric active sites of peptidases and hydrolases represent the primary catalytic regions where substrates bind and undergo chemical transformation via the addition of water. Peptidases, a major subclass of hydrolases, specifically target peptide bonds, playing critical roles in protein turnover, signaling, and digestion (nih.gov, 1.1.2, 1.1.3). These sites are characterized by specific catalytic residues, such as the serine-histidine-aspartate triad or metal ions like zinc, which facilitate the nucleophilic attack on the substrate (nih.gov, 1.3.3, 1.4.1). In pharmacology, these sites are among the most successful therapeutic targets, with drugs designed to mimic the transition state or covalently bind to catalytic residues to block activity (nih.gov, 1.2.1, 1.4.3). However, the high degree of structural conservation within enzyme families often poses significant challenges for achieving high selectivity, leading to potential off-target effects and therapeutic challenges (nih.gov, 1.2.5, 1.3.1). Consequently, while these sites are highly druggable, the term describes a broad class of structural features across thousands of different enzymes rather than a single specific therapeutic target (nih.gov, 1.2.4).

Other names

Protease active sitesCatalytic triadsHydrolase pocketsOrthosteric catalytic sitesEnzyme active sites

Competitive inhibition at the orthosteric site, often involving transition-state mimicry or covalent modification of catalytic residues to block substrate binding and catalysis.