Medical Definition of A helix

1. The helical (commonly right-handed) form present in many proteins, deduced by Pauling and Corey from X-ray diffraction studies of proteins such as alpha-keratin; the helix is stabilised by hydrogen bonds between, e.g., ==C==O and HN== groups (symbolised by the centre dot in ==CO-HN==) of different eupeptide bonds. In a true a helix, there are 3.6 amino acid residues per turn of the helix. Synonym: 3.613 helix, Pauling-Corey helix. Collagen helix, an extended left-handed helix resulting from the high levels of glycine, l-proline, and l-hydroxyproline present in the collagens. There are 3.3 amino acids per turn of the helix. Three of those left-handed helices form a triple superhelix that is right-handed. (05 Mar 2000)

Lexicographical Neighbors of A Helix

a bit much(p)
a capella singing
a cappella
a cappella singing
A chain
a couple of(a)
A disks
a fetoprotein
a few(a)
A fibres
a fortiori
a good deal
a granules
a great deal
a haemolysin
a helix (current term)
A horizon
a hundred
a hundred and one
a hundred thousand
a hundred times
a Kempis
A layer
a la carte
a la mode
a la mode(p)
A level
a little
a lot
a million

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