Alpha Helix Structure Model

SKU: 68796W

$30.95USD Each


This Indigo® alpha helix model consists of 20 amino acid cores to show secondary structure based on 3.6 amino acid residues per turn. This helical polypeptide backbone consists solely of alpha carbons and amino & carboxyl groups. “R” groups are indicated with a univalent green atom.

These can be replaced with optional parts to show actual amino acid residues such as methionine, alanine, leucine, glutamate and lysine in the polypeptide chain. The alpha helix model is also a useful complement for the Indigo® 12 base pair DNA double helix model. It fits the major groove easily & shows steric hindrance when squeezed into the minor groove. 

If you buy 2 model kits you can compare the differences in structure between the alpha helix and beta pleated sheet.


50mm bonds with white inserts represent hydrogen atoms that form hydrogen bonds. This makes it clearer how the alpha helix structure is kept stable through bonds (n to n+4) between the amide hydrogen of one amino acid and the carbonyl oxygen of another amino acid, 4 residues away in the amino acid sequence

The amino acid sequence can be modified further with cysteine residues to show tertiary structure through cross linking if so desired.

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