superhelix

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superhelix

[¦sü·pər′hē‚liks]

(biochemistry)

A macromolecular structure consisting of a number of alpha-helical polypeptide strands which are twisted together.

References in periodicals archive ?

Tropomyosin is a long protein (~40 nm) with two [alpha]-helical polypeptide chains that form a coiled coil in a parallel orientation by winding around each other in a left-handed superhelix. Tropomyosin molecules lie along the actin helix and successive molecules interact in a head-to-tail manner, and the junction is formed between the COOH-terminus of one tropomyosin and the NH-terminus of the next.

Mechanism of the calcium-regulation of muscle contraction --in pursuit of its structural basis--

Three of these helical strands then twist around on one another, like the strands of a rope, in a right-handed superhelix, to make up the complete molecule.

Revitalize aging skin with topical vitamin C

Domain III has a sandwich topology and domain IV is a superhelix. The APN have conserved structures, with slightly mutations just like result of coevolution with Cry proteins.

Minireview and hypothesis: homology modelling of spodoptera litura (lepidoptera: noctuidae) aminopeptidase N receptor