Protein folding sequence:

Primary Sequence- A linear protein structure that is held together by hydrophobic bonds and is main sequence.

Secondary Structure- Forms spontaneously between backbone units if the side chain doesn’t block it. Two shapes are formed..alpha helix and beta pleated sheet.

Tertiary Structure- Forms spontaneously between side chain and can be hydrogen bonds, ionic bonds, hydrophobic interactions, and disulfide bridges.

Quaternary Structure- All of the polypeptide chains interact together to form a functional protein.