MICRB265 Lecture Notes - Clostridium, Growth Medium, Endospore
21 Sep 2013
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Document Summary
In g-ve bacteria, the inner and outer membranes are very different: the outer membrane is very complex (and therefore very important) while the inner membrane is quite simple. Lipoproteins link the membrane to the periplasm. Lipopolysaccharides are very important to g-ve cells: barrier, exact composition is different for each organism but there the basic order is uniform. Lipid a is an endotoxin to animals (only known endotoxin) O-specific polysaccharides have the same structure in all g-ve bacteria and the number of monomers it consists of can vary. Lipid a connects to the lipid bilayer. Porin is there to facilitate the transport of small hydrophilic substances. Molecules < 600 daltons can pass through. Contains enzymes that help the cell acquire nutrients and aid in metabolism. Very small in g-ve bacteria and just about non-existent in g+ve bacteria: to acquire nutrients, g+ve bacteria will secrete exoenzymes that will help with nutrient transport.
