Sulfhydryl-containing protein

Sulfhydryl-containing proteins are those that possess free thiol (–SH) groups, typically as cysteine residues. These proteins are widely distributed in all living cells and display essential roles in protein structure (through disulfide bond formation), redox regulation, enzymatic catalysis, and metal binding. The thiol group’s high nucleophilicity and redox sensitivity make these proteins major participants in maintaining cellular redox homeostasis, sensing oxidative stress, and transmitting redox-based signals. Enzymes dependent on sulfhydryl chemistry include proteases (like cysteine proteases), oxidoreductases, and transferases, among others. Because the presence of a sulfhydryl group is a chemical feature rather than a unique functional domain, this category encompasses thousands of diverse proteins, many of which have distinct biological functions and disease associations[1][3][5][6].\n\nImportantly: “Sulfhydryl-containing protein” or “sulfhydryl-containing enzyme” is not a precise drug target designation; instead, it is a broad chemical/structural descriptor. For therapeutic specificity, individual protein or enzyme names (e.g., “Caspase-3”, “Protein tyrosine phosphatase 1B”, “Glutathione S-transferase”, etc.) should be used.

Other names

Thiol-containing proteinSH-containing proteinprotein thiolprotein sulfhydrylthiol proteincysteine-containing proteinmercaptan protein

Covalent modification (alkylation, oxidation, S-nitrosylation, disulfide exchange) of cysteine/thiol residues to modulate protein/enzyme activity\nRedox modulation\nMetal chelation