The linear sequence of amino acids within a protein is considered the primary structure of the protein. Proteins are built from a set of only twenty amino acids, each of which has a unique side chain.

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 ...

Each cell in your body relies on precise communication with other cells to function properly. At the center of this process ...

Amyloid precursor protein (APP) plays a central role in Alzheimer ... Here we describe the 1.8 Å resolution crystal structure of the N-terminal, heparin-binding domain of APP (residues 28 ...