NBCZone: Universal three-dimensional construction of eleven amino acids near the catalytic nucleophile and base in the superfamily of (chymo)trypsin-like serine fold proteases.

International Journal of Biological Macromolecules
Alexander I DenesyukKonstantin Denessiouk

Abstract

(Chymo)trypsin-like serine fold proteases belong to the serine/cysteine proteases found in eukaryotes, prokaryotes, and viruses. Their catalytic activity is carried out using a triad of amino acids, a nucleophile, a base, and an acid. For this superfamily of proteases, we propose the existence of a universal 3D structure comprising 11 amino acids near the catalytic nucleophile and base - Nucleophile-Base Catalytic Zone (NBCZone). The comparison of NBCZones among 169 eukaryotic, prokaryotic, and viral (chymo)trypsin-like proteases suggested the existence of 15 distinct groups determined by the combination of amino acids located at two "key" structure-functional positions 54T and 55T near the catalytic base His57T. Most eukaryotic and prokaryotic proteases fell into two major groups, [ST]A and TN. Usually, proteases of [ST]A group contain a disulfide bond between cysteines Cys42T and Cys58T of the NBCZone. In contrast, viral proteases were distributed among seven groups, and lack this disulfide bond. Furthermore, only the [ST]A group of eukaryotic proteases contains glycine at position 43T, which is instrumental for activation of these enzymes. In contrast, due to the side chains of residues at position 43T prokaryotic and viral ...Continue Reading

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Mar 14, 2021·International Journal of Biological Macromolecules·Alexander I DenesyukKonstantin Denessiouk
Oct 16, 2020·International Journal of Biological Macromolecules·Konstantin DenessioukAlexander I Denesyuk

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