Lecture 5 - Define membrane cell wall cell envelope...

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Define; membrane, cell wall, cell envelope Membrane – any thin sheet or layer Cell wall (envelope) – provides shape and rigidity, maintains an internal osmotic pressure Describe Peptidoglycan Stucture Beta-1-4 glycosidic bond between NAM and NAG (6 carbon sugars) 4 peptide bonds coming off NAM Describe Gram-negative and Gram-positive Cell Envelopes Gram-negative has a bond between D-Ala and DAP of two NAM & NAG’s Gram-positive has a penta-glycine bridge between D-Ala and L-Lys Gram negative Gram Positive Thin peptidoglycan Thick peptidoglycan No teichoic acid Abundant teichoic acid Perilasmic space present Perilasmic space absent High lipid content Low lipid content Susceptible to mechanical stress Resistant to mechanical stress Low susceptibility to lysozyme High susceptibility to lysozyme Low susceptibility to penicillin High susceptibility to penicillin Low susceptibility to anionics Low susceptibility to anionics Explain Endotoxin (LPS) Toxin to warm-blooded animals, net (-) charge
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