A beta-pleated sheet is formed by hydrogen bonds between the carboxyl group of one amino acid on one sheet and the hydrogen molecule of an amino acid on another sheet.The strong bonds and stability of this structure gives it a strong tensile strength, which allows it to form the shape seen in DNA. The alpha-helix is a coil formed by hydrogen bonds between the carbonyl group and the amino group of different amino acids.Secondary protein structure is the repetitive folding of polypeptide chains by hydrogen bonds between the hydroxyl (OH) group and the hydrogen molecule of the adjacent amino acid, leading to the unique shape of the protein. The most common examples are the alpha-helix and beta-pleated sheets. These bonds form between the N terminal and C terminal of consecutive amino acids, and are highly resistant to heat or chemicals.Īny mutation in this amino acid sequence can affect protein folding in the subsequent stages of protein structure, leading to problems with the protein’s function. Primary protein structure is defined as multiple amino acids bound together via strong covalent peptide bonds to form a polypeptide chain. By Kep17, via Wikimedia Commonsįigure 2 – Overview of protein structure.
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