ABSTRACT
The order of the amino acids in a protein is called the primary structure. The amino acid sequence of a peptide or a protein is always listed from the amino acid with the free amine group to the amino acid with the free carboxyl group, that is from the N-Merminus to the C-terminus. The secondary structure of a peptide or protein centres on the 3-dimensional shape of the peptide bond. When a bend occurs in a protein, very distant amino acid sequences in the protein can become aligned with each other. This enables the formation of hydrogen bonds between adjacent chains. The bend in the protein can occur so that the chains are in the same orientation. The tertiary structure of a protein is the overall shape of the protein. The shape of a protein is critical to its function and hence there is much research being carried out on the shape of proteins.
