Lecture_07 - Lecture 7 Finish Prokaryotic Cell Envelopes...

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1 Lecture 7 Lecture 7 Finish Prokaryotic Cell Envelopes BBOM 11e Sec. 4.8-4.9, 11.9 Virtual Field Trip Æ Microbial Motility Movies Microbial Motility and Chemotaxis BBOM 11e Sec. 4.14, 4.16 Integral Membrane proteins: Transport Three classes of membrane transport systems: Three classes of membrane transport systems: Simple transport Group translocation ABC system Energy from ATP (e.g Uniporters, symporters, antiporters) (e. g. phoshotransferase system) (e.g. sugar transport systems) Function: Move small molecules across phospholipid permeability barrier against a concentration gradient; energy is required BBOM 11e Sec. 4.6-4.7 A TP B inding C assette Energy from PMF Energy from PEP
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2 Integral Membrane Proteins: Other functions Integral Membrane Proteins: Other functions Synthesis of cell envelope components to be assembled outside the cell membrane Environmental sensing—protein-mediated tactic responses coupled with motility. ATP synthesis - ATPases powered by PMF Translocases for protein export, e.g. exoenzymes secreted by the Sec system Questions? Questions?
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3 Most Bacterial Cell Walls Contain Peptidoglycan Glycan tetrapeptide repeating structure NAM NAG Read: BBOM 11e Sec. 4.8-4.9
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Lecture_07 - Lecture 7 Finish Prokaryotic Cell Envelopes...

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