PROTEINS
- Primary Structure: A linear sequence of amino acids, peptide bonding occurs between 2 amino acids. The peptide bond is polar resulting in attractive forces with a slightly negative and positive portion. This leads to our second structure.
- Secondary Structure: Spiral/Alpha-Helix or pleated sheet shape forms due to the aforementioned -H bonding from the primary structure.
- Tertiary Structure: The Alpha-Helix than twists and forms into an irregular shape due to ionic, covalent, and H bonding occuring between the R groups of the secondary structure. The shape is very specific to the original sequence or order of the amino acid chains.
- Quaternary Structure: The organization of 2 or more polypeptide chains (tertiary). Similar bonding causes these shapes to form it is just a more complex version of a tertiary structure (i.e. multiple polypeptide).
Here below is a video to briefly overview these concept:
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