Lecture_07 - Lecture 7 Prokaryotic Cell Envelopes BBOM 11e...

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Lecture 7 Prokaryotic Cell Envelopes BBOM 11e Sec. 4.8-4.9 , 11.9 Virtual Field Trip Microbial Cell Behavior Motility and Chemotaxis BBOM 11e Sec. 4.14, 4.16
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Most Bacterial Cell Walls Contain Peptidoglycan Glycan tetrapeptide repeating structure NAM NAG Read: BBOM 11e Sec. 4.8-4.9 Peptide cross-linkages B 1-4 Linkage
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Peptidoglycan Porins Periplasmic Space (The space between the inner and outer membranes) Lipoteichoic Acids Lipoprotein Lipopolysaccharide (LPS) Bound to membrane Bacterial Cell Walls: Gram-negative vs. Gram-positive Outer Membrane No Outer Membrane Teichoic Acids Polyalchohol phosphates Provides negative charges
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Archaeal Cell Envelopes Bilayer with ether-linked lipids Monolayer: Diethers with central covalent linkages Isoprene Fatty acid Bacteria Eukarya Archaea Pseudopeptidoglycan (No Muramic acid, B 1-3 Linkages) Glycoproteins Protein subunit layers (a.k.a. S-layers) Ester Ether BBOM 11e, p.68 BBOM 11e , p. 78-79 Ether Ether Ether-linked lipids in cell membrane Polysaccharides Diverse Cell Wall Structure and Chemistry
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Cell Wall Functions 1. Resist Turgor Pressure 2. Maintain Rigidity and Shape 3. A Filter for Macromolecules e.g. Porins in
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