An important type of covalent bond formed between two sulfur atoms of different cysteines in a protein. Disulfide bonds (hnkages, bridges) contribute to holding proteins together and also help provide the internal structure (conformation) of the protein.
A covalent bond between two sulfur-containing amino acids, which helps maintain the shape of proteins such as insulin, keratin, and antibodies.
Strong chemical side bond that joins the sulfur atoms of two neighboring cysteine amino acids to create one cystine, which joins together two polypeptide strands like rungs on a ladder.