alpha helix

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alpha helix

A secondary structure of proteins, characterized by a single, spiral chain of amino acids stabilized by hydrogen bonds.

[From alpha-form, the form taken by unstretched protein molecules.]

al′pha-hel′i·cal (-hĕl′ĭ-kəl, -hē′lĭ-) adj.

alpha helix

(Biochemistry) biochem a helical conformation of a polypeptide chain, found abundantly in the structure of proteins

al′pha he′lix

the spatial configuration of many protein molecules in which the polypeptide backbone is stabilized by hydrogen bonds between amino acids in successive helical turns.
alfa uzvojnica
References in periodicals archive ?
The extrusion parameters influenced changes in protein structure in the amide I and II regions and in beta sheet and alpha helix composition.
The secondary structure of a polypeptide is the way a small part, fairly near in the polypeptide sequence, curls up into an alpha helix or beta pleated sheets, or sometimes even no structured shape at all.
Consider chemist Linus Pauling, who described the alpha helix structure of proteins in 1951.
Interface domain located after the residue 360 to the end of the structure which contains four stranded antiparallel beta sheets and one alpha helix.
Some students might create pencil-binding domains with multiple loops--these could be considered similar to an alpha helix secondary structure.
Briefly, HCA designs a sequence on the surface of a cylinder with the connectivity of an alpha helix.
pi of domain, half-life, instability index, hydropathicity, alpha helix, extended strand, beta turn, random coil stability, analysis of domains were performed and it was observed that mutation of single amino acid has a great affect on the domain structure and stability (Table 3).
An alpha helix, like scotch tape wrapped around a pencil to form a tube, is a common shape seen in proteins, one of the main classes of biological molecules.