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alpha helix

   Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
alpha helix
n.
The helical form, turned in a right-handed direction, of many proteins.

helix [he´liks] (pl. he´lices, helixes) (Gr.)
1. a winding structure; see also coil and spiral.
2. the superior and posterior free margin of the pinna of the ear.
α-helix (alpha helix) the complex structural arrangement of parts of protein molecules in which a single polypeptide chain forms a right-handed helix.
double helix (Watson-Crick helix) the structure of deoxyribonucleic acid (DNA), consisting of two coiled chains, each of which contains information completely specifying the other chain.


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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.
The topology of constructed model is having one Alpha helix, two antiparallel Beta sheets and four loops.
9) Watson (now 23, became a research fellow at Cambridge) and Crick (now 35, and a graduate student there) had admired the work of Linus Pauling who had discovered in 1948 "that many proteins take the shape of an alpha helix, spiraled like a spring coil.
 
 
 
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