MICRB 265 (09/23/13) Structure and Function (Last Lecture)

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Microbiology (Biological Sciences)
Brian Lanoil

MICRB 265 (September 23, 2013) Structure and Function (con’t) Review on Types of Flagella 1. Monotrichous – one single flagellum 2. Amphitricous – flagellum attached to both ends 3. Lophotrichous – tuft of flagella at one side 4. Petritrichous – many flagella spread about the outside of the cell Flagellum of Gram Negative Bacteria  Run by proton motive force and NOT ATP  Rings: (inner most first) o C-ring o MS-ring  MS-ring generally refers to BOTH the “MS” and “C” rings o P-ring  In peptidoglycan o L-ring  On LPS o Overall, there are 4 rings in the assembly of g-ve flagella (or three if you count the MS- and C- rings as one unit)  3 Protons = one full rotation of flagella Development of Flagellum 1. Assembly of MS-ring (and C-ring at that… they are referenced to as one ring) 2. P-ring assembly in periplasm 3. L-ring formed in LPS 4. Hook and cap formed 5. Filament grows and goes through the hook a. Cap is there to keep the end of the flagellum from fraying b. Newer end of filament is at the cap, older filament at the base  The flagellum stays with the cell for the extent of the cell’s life  The L- and P-rings don’t actually rotate with the flagellum, it is the rod connecting the MS- and C-ring that rotates o Rod makes the hook rotate, which in turn makes the filament rotate  G+ve bacteria only have 2 rings (3 is you count the C-ring to be separate from MS-ring) o No L-ring because there is no outer membrane) Gliding Motility  Facillitated by “gliding proteins” in the cytoplasmic and outer membrane o There is a track in peptidoglycan that connects to this protein. Grab and drag motion allows for gliding of cell (Sort of like many tiny click-and-drags)  Also run by the proton motive force  Gliding bacteria move much slower than flagellated bacteria  Specialized type of movement for solid surfaces o Doesn’t mean that they can’t survive in liquid cultures though  Liquid cultures actually make life easier for them because their food comes to them! (They don’t have to search for food) Endoflagella  Axial filaments: o Filament goes through the length of the c
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