Prep Lecture 3
1. Basic structure of an amino acid and what are the different classes of amino acids.
a. The generalized structure of an amino acid has a central carbon atom attached to an
amino group (-NH2), a carbonyl group (-COOH), and a hydrogen atom
b. Proteins are synthesized from 20 different amino acids.
four different classes of amino acids determined by different side chains: (1) non-polar
and neutral, (2) polar and neutral, (3) acidic and polar, (4) basic and polar.
2. Chemistry of the peptide bond and how it is formed.
a. Carboxyl group + amino group -> peptide bond + H2O
b. Covalent bonds link amino acids into chains called polypeptides
3. The four levels of protein structure.
a. Primary structure:
The sequence of amino acids in a protein