2-Structure_and_Function_Jan15-17

Phototaxis light phototrophic organisms aerotaxis

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Unformatted text preview: gy of Microorganisms, 13th EdiAon. 48 Surface appendages •  In addiAon, prokaryotes may have other surface appendages: flagella and fimbriae. •  Flagella are used for locomoAon (moAlity). Usually 15- 20 μm long. The flagella of Archaea are sAll not fully understood. 49 Brock Biology of Microorganisms, 13th EdiAon. Prokaryote moAlity Max speed: 50 cell lengths/sec hbp://www.youtube.com/watch?v=4hexn- DtSt4 50 Flagella Monotrichous (1 flagellum) Lophotrichous (many flagella, originaAng from one end of the cells, polar flagellaAon) Peritrichous (many flagella, all around the cell surface) 51 Brock Biology of Microorganisms, 13th EdiAon. Flagellum structure of Bacteria •  Gram- negaAve: L, P, MS and C rings. •  Gram- posiAve: P, MS and C rings •  •  •  •  L – LPS P – PepAdoglycan MS – Membrane Superficial C - Cytoplasm Proton moAve force 52 Brock Biology of Microorganisms, 13th EdiAon. Flagellum biosynthesis 53 Brock Biology of Microorganisms, 13th EdiAon. The flagellum motor 54 hbp://www.youtube.com/watch?v=Ey7Emmddf7Y Movement 55 Brock Biology of Microorganisms, 13th EdiAon. Flagellum structure of Archaea No channel, growth from the base (presumably) 56 VanDyke, D. J., Ng, S. Y. M., Chaban, B., Wu, J. and Jarrell, K. F. 2008. Archaeal Flagella. eLS. Gliding moAlity Lateral movement of surface adhesins SecreAon of mucus type IV pilus- dependant The surprisingly diverse ways that prokaryotes move Ken F. Jarrell & Mark J. McBride Nature Reviews Microbiology 6, 466- 476 (June 2008) 57 Taxis •  Directed movement toward or away from a gradient of chemical or physical agents. –  –  –  –  –  Chemotaxis: chemicals, nutrients, anAbioAcs, etc. Phototaxis: light (phototrophic organisms Aerotaxis: oxygen Osmotaxis: ionic strenght (high/low salt concentraAon) Etc. 58 Brock Biology of Microorganisms, 13th EdiAon. Ex: Phototrophic consorAum Green: MoAlity N...
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This note was uploaded on 03/20/2014 for the course PSYC 101 taught by Professor Catone during the Spring '07 term at CSU Fullerton.

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