left-handed helix
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Helix — This article is about the shape. For other uses, see Helix (disambiguation). The helix (cos t, sin t, t) from t = 0 to 4π with arrowheads showing direction of increasing t … Wikipedia
helix — 1. [NA] The margin of the auricle; a folded rim of cartilage forming the upper part of the anterior, the superior, and the greater part of the posterior edges of the auricle. 2. A line in the shape of a coil (or a spring, or the threads on a bo … Medical dictionary
helix — A three dimensional spiral; a curve that lies on a cylinder or cone. Spirals helixes and volutes are among the ten classes of patterns. The chirality of a helix is the direction of its turning, or handedness. A right handed helix turns as a… … Glossary of Art Terms
helix — noun /ˈhiːlɪks/ a) A curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three dimensional curve seen in a screw or a … Wiktionary
Polyproline helix — In proteins, a left handed polyproline II helix (PPII, poly Pro II) is formed when sequential residues all adopt (φ,ψ) backbone dihedral angles of roughly ( 75°, 150°) and have trans isomers of their peptide bonds. Similarly, a more compact right … Wikipedia
Beta helix — A beta helix is a protein structure formed by the association of parallel beta strands in a helical pattern with either two or three faces. The structure is stabilized by inter strand hydrogen bonds, protein protein interactions, and sometimes… … Wikipedia
Pi helix — Side view of a standard π helix of L alanine residues in atomic detail. Two hydrogen bonds to the same peptide group are highlighted in magenta; the oxygen hydrogen distance is 1.65 Å (165 pm). The protein chain runs upwards, i.e., its N terminus … Wikipedia
Nucleic acid double helix — Double helix redirects here. For other uses, see Double helix (disambiguation). Two complementary regions of nucleic acid molecules will bind and form a double helical structure held together by base pairs. In molecular biology, the term double… … Wikipedia
right-handed — /ˈraɪt hændəd/ (say ruyt handuhd) adjective 1. having the right hand or arm more serviceable than the left; preferring to use the right hand. 2. adapted to or performed by the right hand. 3. situated on the side of the right hand. 4. moving or… …
Alpha helix — A common motif in the secondary structure of proteins, the alpha helix (α helix) is a right handed coiled conformation, resembling a spring, in which every backbone N H group donates a hydrogen bond to the backbone C=O group of the amino acid… … Wikipedia
310 helix — A 310 helix is a type of secondary structure found (rarely) in proteins. tructureThe amino acids in a 310 helix are arranged in a right handed helical structure. Each amino acid corresponds to a 120° turn in the helix (i.e., the helix has three… … Wikipedia
