3D structure formed by further folding of polypeptide
disulfide bridges
ionic bonds
hydrogen bonds
Primary structure of a protein is the order and number of amino acids in a protein. Initial sequence of amino acids and will determine proteins functions.
Secondary structures is the shape that the chain of amino acid makes , either alpha helix or beta pleated sheets bonded by weakhydrogen bonds
Tertiary structure of proteins is the 3Dshape of the protein and is formed from furthertwisting and folding .
Contains :
Disulfide bridges
Ionic bonds
hydrogenbonds
Disulfide bridges - strong bonds between sulfur and R group
Ionic bonds form between the carboxyl group and amino groups that are not in the peptide bond, weaker than disulfide bridges and easily broken by pH
Hydrogen bonds - numerous and easilybroken
The Quaternary structure of a protein is the precise 3D structure held together by the same types of bond as tertiarystructure. May involve addition of prosthetic groups e.g metal ions or phosphate groups