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Peptides

by Kevin Ahern, PhD
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    In this presentation, we'll start to make the connection between the structures of individual amino acids and the properties of the proteins that contain those amino acids. I’m going to focus on four areas of protein structure in this presentation. These four areas of protein structure include what are called primary, or close interactions between amino acids that are immediately adjacent to each other; secondary structure, which arise from interactions between amino acids that are not immediately adjacent to each other, but that are close; tertiary structures that arise in proteins as a result of interactions between amino acids that are far apart in primary sequence; and finally quaternary structure, which arises with interactions between separate protein units. Now we remember that the basic structure of amino acids that’s shown on the left. On the right I've shown a schematic representation of one of the types of protein structure that exists commonly. This structure is known as the alpha helix, and was one of the structures discovered by Linus Pauling for which he won the Nobel Prize. Now in order for a protein to be formed, individual amino acid building blocks have to be joined together. The joining together of those building blocks, happens as result of the formation of peptide bonds. To make a peptide bond, the alpha carboxyl of one amino acid is joined to the alpha amino of the adjacent amino acid. This process occurs in ribosomes, and in the process of this happening, a water molecule is split out as you can see. Now the peptide bond shown here in green is the link between the two individual amino acids. The peptide bond that has been formed, which is shown in the center of this figure, has some interesting chemistry associated with it. The interesting chemistry...

    About the Lecture

    The lecture Peptides by Kevin Ahern, PhD is from the course Biochemistry: Basics. It contains the following chapters:

    • Polypeptides
    • Levels of Protein Structure & Primary Structure
    • Secondary Structure
    • Tertiary Structure
    • Quaternary Structure & Summary

    Included Quiz Questions

    1. Alpha nitrate
    2. Alpha amine
    3. Alpha carboxyl
    4. R-group
    1. Water
    2. Ammonia
    3. Oxygen
    4. Nitrogen
    1. Alpha carboxyl - alpha amine
    2. Alpha carbon - R group
    3. Alpha carbon - alpha carboxyl
    4. Alpha carbon - alpha amine
    1. Primary
    2. Secondary
    3. Tertiary
    4. Quaternary
    1. Secondary
    2. Primary
    3. Tertiary
    4. Quaternary
    1. Hydrogen bonds
    2. Covalent bonds
    3. Disulfide bonds
    4. Ionic bonds
    1. Collagen
    2. Keratin
    3. Hemoglobin
    4. Myoglobin
    1. Disulfide bonds
    2. Ionic bonds
    3. Hydrogen bonds
    4. Hydrophobic bonds
    1. Lipid bilayer
    2. Surface of cell
    3. Amino terminus
    4. Carboxyl terminus

    Author of lecture Peptides

     Kevin Ahern, PhD

    Kevin Ahern, PhD


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