Polypeptide chains fold because folding leads to a more stable, lower-energy structure. Hydrophobic side chains tend to move away from water, while hydrogen bonds, charge interactions, and covalent disulfide bridges can help stabilize the resulting conformation.
Folding is often described as spontaneous because the Gibbs free energy change is negative under favorable conditions. The exact final shape depends on sequence, environment, and the competing balance between stabilizing and destabilizing interactions.
Folding can influence solubility, aggregation, assay behavior, and detection. This becomes more relevant as sequences become longer, more hydrophobic, or more structurally constrained.
Analyze your sequence to better understand peptide behavior: