alpha helix

(redirected from Alpha helices)
Also found in: Medical, Encyclopedia.
Related to Alpha helices: alpha helix, Beta sheets

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 classic literature ?
Grandfather," said Charley, "I am tired to death of this dismal rain and of hearing the wind roar in the chimney.
I am tired to death of living in this cold, dark, windy, smoky, creaking, groaning, dismal old house.
Each subunit consists of two domains; the smaller, thioredoxin-like, N-terminal domain (1-74 residues) is composed of 4 beta-sheets and 4 alpha helices and the C-terminal domain that consists of seven alpha helices.
The number of alpha helices slightly declined, by 2% to 3%, as a result of the processing.