The secondary structure of the protein is formed due to hydrogen bonds between the residues of the carboxyl and amino groups of various amino acids and has the form of a right-handed spiral.
The tertiary structure of the protein is formed due to the combination of amino acids located in the polypeptide chain at some distance from each other, hydrogen, ionic, disulfide (S-S) bonds and hydrophobic interactions.
Due to this, the protein molecule takes a spherical shape and is called a globule ..
The quaternary structure of a protein is the union of several protein molecules having a tertiary organization. The quaternary structure of some proteins includes non-protein components. For example, hemoglobin contains iron.
A multilevel structural organization of protein molecules is necessary for them to perform their specific functions.
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