Practice Problem Set # 3 114A; 2006 1. Name the amino acids frequently seen in α-helices, β-strands and turns. 2. Discuss the potential contributions of hydrophobic and van der waals interactions and ionic and hydrogen bonds in the tertiary structure of a protein. Discuss how the following four amino acids, Asp, Leu, Tyr and His, can participate in the four types of interactions mentioned above maintain the tertiary structure. 3. Two polypeptides A & B have similar tertiary structures, but A exists as a monomer and B as a dimer. What differences are expected in the primary sequences of A and B to have different subunit compositions? 4. Describe different steps taken to determine the sequence of a peptide.
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