Disulfide Bridge
A disulfide bridge (disulfide bond) is a covalent bond formed between the thiol (-SH) groups of two cysteine residues via oxidation, producing a -S-S- linkage. These bonds can form within a single peptide chain (intramolecular) or between two chains (intermolecular).
Disulfide bridges play a critical role in stabilizing the three-dimensional structure of peptides and proteins. They constrain the conformational flexibility of the chain, which can be essential for maintaining the shape required for receptor binding.
In peptide synthesis, disulfide bond formation requires careful control of oxidation conditions. Incorrectly paired disulfide bonds (in peptides with multiple cysteines) produce misfolded variants that are detectable as impurities by HPLC. Protecting group strategies during synthesis prevent premature disulfide formation.
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Related Products
Related Terms
Amino Acid
Organic molecules containing both an amino group (-NH2) and a carboxyl group (-COOH) that serve as the building blocks of peptides and proteins.
Cyclization
The formation of a ring structure within a peptide, typically through side-chain-to-side-chain, head-to-tail, or disulfide linkages, often increasing metabolic stability.
Oxidation
A chemical reaction adding oxygen to peptide residues, particularly methionine, cysteine, and tryptophan, leading to structural modification and loss of activity.
Purity Percentage
The proportion of target peptide relative to total detected material in an HPLC analysis, expressed as a percentage of chromatographic peak area.
Research Use Only
FOR RESEARCH USE ONLY. Products sold by Healthy Aminos are intended strictly for in-vitro research and laboratory use. Not for human or animal consumption. Not FDA approved. By purchasing from Healthy Aminos, the buyer acknowledges that these products are not intended to diagnose, treat, cure, or prevent any disease. All products are sold as reference standards and research chemicals only.