The 3-dimensional structure of Glucagon, an alpha helix
is a polypeptide hormone consisting of a row of 29 amino acids.
Primary level of protein structure:
The sequence of these amino acids is as follows (using 3-letter codes for amino acids):
Secondary level of protein structure:
This polypeptide chain folds to form a short alpha helix
, stabilised by various interactions between the components.
Tertiary level of protein structure:
The 3-dimensional structure of the polypeptide chain is locked in place by other stronger bonds between the sidechains ( -R groups) of the amino acid residues.