Disulfide bond in protein and peptide

Disulfide bonds are covalent linkages formed between the sulfur atoms of two cysteine residues in proteins or peptides (R-S-S-R'). They are crucial in stabilizing the three-dimensional structure of many proteins and peptides, especially those that function extracellularly or are secreted. These bonds play essential roles in protein folding, structural stability, and the regulation of biological activity. Their correct formation and maintenance are vital for protein function; mispairing or reduction can cause protein misfolding, aggregation, and disease. Disulfide bonds also act as redox-sensitive switches, modulating activity in response to the cellular or extracellular environment. They are not a protein, receptor, or classical therapeutic target but rather a chemical feature or motif within proteins and peptides, whose modulation can be leveraged in biotechnology and therapy (e.g., through reducing agents)[1][2][4][5]. Disulfide bond in protein and peptide is not a classical drug target (such as a receptor or enzyme) but a structural motif or chemical property. If a structured database is needed, this would be marked as an incorrect entry for "target" because it is not a unique protein, receptor, or enzyme; rather, it is a ubiquitous structural feature found in many proteins. The field "is_incorrect" should be set to true. The biologically relevant proteins involved in the formation or reduction of disulfide bonds include enzyme families such as protein disulfide isomerase (PDI) and thioredoxins, which are established therapeutic targets in some contexts[2][4].

Other names

Disulfide bridgeS-S bondcystine linkageprotein disulfide bond

Reduction of disulfide bonds (protein denaturation, chemical reduction). Modulation of redox state (affecting protein function or folding). Inhibition or facilitation of disulfide bond formation (in protein engineering or therapeutics).