Proteins have four levels of structure: primary (amino acid sequence), secondary (local folding patterns like alpha helices and beta sheets), tertiary (overall 3D shape), and quaternary (assembly of ...

The sequence of amino acids in the chain determines how the chain will fold up to make the protein, so different proteins have different three-dimensional shapes. The three-dimensional shape of a ...

Quaternary structure formation (assembly ... to the addition of a substoichiometric amount of fibrils to soluble NM protein to increase its rate of conversion to amyloid fibrils.