by OSU
Video Lecture 25 of 25
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Date Added: February 15, 2015

Lecture Description

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1. The immune system contains the innate immunity system and the adaptive immunity system.

2. The innate system uses a Toll-like receptor that binds to the PAMP lipopolysaccharide structure on the surface of Gram negative bacteria.

3. The adaptive immune system system contains two major groups of lymphocytes (immune system cells), B cells and T cells. B cells are involved in the production of antibodies and T cells are involved in both cellular killing, as well as stimulation of the B cells.

4. Immunoglobulin G (IgG) is one of five major antibody classes made by the B lymphocytes of the humoral immune system (cellular immune system described below). IgG is the most abundant antibody in the blood serum. Others include IgA (in mucus), IgM (early responder), IgD (function uncertain), and IgE (parasite protection).

5. The structure of antibodies has several common features. First, they are composed of two sets of Heavy (H) and light (L) chains arranged in a Y shape. Both the H and L chains have constant and variable regions. The variable regions of the H and L chains are adjacent to each other and the variation in these regions are responsible for antibody diversity (108 different shapes). The different classes of antibodies vary in the H chains in the constant region.

6. Molecules bound by antibodies are called antigens. Specific structural regions of an antigen bound by an antibody are called epitopes.

7. IgM antibodies are the first responders of the humoral immune system.

8. Antibody diversity arises from recombination of DNA sequences and splicing of mRNA sequences for coding for the variable regions of H and L chains.

9. For the light chains, the coding sequences are on human chromosome 2 and involve three protein domains - V, J, and C regions. V is the variable portion, J is the portion that joins the V to the C, which is the constant region. Mixing and matching of domains by recombination generates tremendous diversity - over 1000 antibodies per base pair of the human genome.

10. In H chains (chromosome 14), recombination occurs between segments V,D, J and C. Recombination within the constant regions of the H chains can result in "class switching" in which a desired variable segment is swapped among to the various segments to put the binding site onto regions to make IgG, IgE, etc.

Course Index

Course Description

This course in general biochemistry is intended to integrate information about metabolic pathways with respiration (respiratory control) and initiate the student into a microscopic world where blueprints are made of deoxyribonucleic acids, factories operate using enzymes, and the exchange rate is in ATPs rather than Yens or Euros. Beyond explaining terms, and iterating reactions and metabolic pathways, this course strives to establish that the same principles that govern the behavior of the world around us also govern the transactions inside this microscopic world of the living cell. And by studying and applying these principles, we begin to understand cellular and bodily processes that include sensory mechanisms.

Topics include:
1. Lipids, Membranes and Transport
2. Electron Transport, Oxidative Phosphorylation and Mitochondrial 3. Transport Systems
3. Lipid Metabolism
4. Nucleotide Metabolism
5. DNA Replication
6. Transcription
7. Translation


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