lecture4 - Lecture 4 4.9 Cell Surface Layers, Pili, and...

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Lecture 4 4.9 Cell Surface Layers, Pili, and Fimbriae 4.10 Cell Inclusions 4.11 Gas Vesicles 4.12 Endospores 4.13 Flagella and Motility 4.14 Gliding Motility 4.15 Cell Motion as a Behavioral Response: Microbial Taxes
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motor hook filament PMF provides energy to drive flagella requires ~1000 H + translocated per rotation the flagellum the flagellum : :
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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 cheetah (fastest animal) moves at 25 body lengths/sec! energetically expensive process → must confer strong selective advantage flagellar motion: flagellar motion:
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steps in biosynthesis of flagella: filament composed of flagellin molecules synthesized in cytoplasm passed through channel inside filament to add on at terminus
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run flagellar arrangements: tumble run (Madigan et al., Fig. 4.43) peritrichous : flagella inserted many places around cell surface polar : flagella inserted at one or both ends of cell
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motility in non-aqueous environments: gliding motility: polysaccharide “slime layer” secreted slime used to pull cell along a surface
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lecture4 - Lecture 4 4.9 Cell Surface Layers, Pili, and...

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