| 释义 |
ˈsuperhelix Biochem.
Pl. -helices.
[super- 5 c.]
A helix formed from a helix; spec. a three-dimensional structure sometimes assumed by polypeptides, in which double protein or DNA helices are themselves coiled into a higher-order helix. Cf. supercoil n.
1964G. H. Haggis Introd. Molecular Biol. iv. 80, α-Helices probably twist together like the strands of a rope, in keratin and myosin, to form super-helices. 1971Nature 5 Nov. 27 (caption) Since the normal DNA double helix is right handed, the superhelix is more likely to be left handed. 1980Sci. Amer. July 100/1 In the chromatin..of higher organisms the DNA is wound around a core of protein to form a left-handed solenoidal superhelix. |