BBlecture4S10s

BBlecture4S10s - Cell Structure and Function (cont.) struct...

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struct func23 Cell Structure and Function (cont.) Cell Structure and Function (cont.) optional surface structures, inclusions, optional surface structures, inclusions, motility motility 4.9: 4.9: Cell Surface Layers, Pili and Fimbriae Cell Surface Layers, Pili and Fimbriae 4.10: 4.10: Cell Inclusions Cell Inclusions 4.11: 4.11: Gas Vesicles Gas Vesicles 4.12: 4.12: Endospores Endospores 4.13: 4.13: Flagella and Motility Flagella and Motility 4.14: 4.14: Gliding Motility Gliding Motility 4:15: 4:15: Cell Motion as a Behavioral Response: Cell Motion as a Behavioral Response: Microbial Taxes Microbial Taxes
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peritrichous polar lophotrichous arrangement of bacterial flagella : struct func24 (Fig 4.44, 12 th ed)
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struct func24a (Fig 4.45, 12 th ed)
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proton motive force (PMF) provides energy to drive flagellum requires ~1000 H + the flagellum the flagellum : : “motor” hook filament struct func25 (Fig 4.47)
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more than 40 genes involved, include regulators movement driven by propeller-like rotation can propel bacterial cells up to 60 cell lengths/sec comparatively a cheetah (fastest animal) moves at 25 body lengths/sec! energetically expensive process → it must confer a strong selective advantage flagellar motion flagellar motion : : struct func26
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the “proton turbine” model: struct func27 (Fig 4.47)
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steps in biosynthesis of flagella: filament is composed of flagellin molecules synthesized in cytoplasm flagellin molecules are passed through channel inside the filament to add on at terminus struct func28 (Fig 4.49)
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This note was uploaded on 06/18/2011 for the course BIO 150 taught by Professor Butler during the Spring '11 term at Waterloo.

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BBlecture4S10s - Cell Structure and Function (cont.) struct...

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