Peptides

Science / Marine Biology / Peptides: Chains of amino acids; often portions of a protein molecule

Pepsin

Science / Biology / Pepsin: An enzyme produced from pepsinogen that initiates protein digestion by breaking down protein into large peptide fragments. An enzyme, produced by the stomach, that chemically breaks down peptide bonds MORE

Methionine

Science / Biology / Methionine: The amino acid coded for by the initiation codon; all polypeptides begin with methionine, although post-translational reactions may remove it. MORE

Quaternary Structure

Science / Biology / Quaternary Structure: In some proteins, a fourth structural level created by interactions with other proteins. Aspect of protein structure determined by the number and arrangement of polypeptides in a large protein such as MORE

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