The alpha helix (α-helix) is a common secondary structure of proteins and is a righthand-coiled or spiral conformation (helix) in which every backbone N-H group donates a hydrogen bond to the backbone C.
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Amines (US: or, UK:, or) are organic compounds and functional groups that contain a basic nitrogen atom with a lone pair.
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Amino acids are biologically important organic compounds containing amine (-NH2) and carboxylic acid (-COOH) functional groups, usually along with a side-chain specific to each amino acid.
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An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.
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The beta bend ribbon, or beta-bend ribbon, is a structural feature in polypeptides and proteins.
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Beta turns (β turns, β-turns, β-bends, tight turns, reverse turns) are very common motifs in proteins and polypeptides.
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Biomolecular structure is the intricate folded, three-dimensional shape that is formed by a protein, DNA, or RNA molecule, and that is important to its function.
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In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom: C.
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In geometry, a dihedral or torsion angle is the angle between two hyperplanes.
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A helix (pl: helixes or helices) is a type of smooth space curve, i.e. a curve in three-dimensional space.
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A hydrogen bond is the electrostatic attraction between polar molecules that occurs when a hydrogen (H) atom bound to a highly electronegative atom such as nitrogen (N), oxygen (O) or fluorine (F) experiences attraction to some other nearby highly electronegative atom.
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A pi helix (or π-helix) is a type of secondary structure found in proteins.
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Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues.
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