BIOL240 Lecture Notes - Lecture 2: Type Three Secretion System, Flagellin, Basal Body
1 Feb 2018
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Type strain a representative reference specimen available in a central depository. If concentrations outside are low and have to move up the concentration gradient, active transport must be used (tonb are like wires to a battery to power this transport) Type iii secretion system: single step transport system, associated with gram-negative bacteria, thi(cid:374)k of a (cid:862)s(cid:455)ri(cid:374)ge(cid:863) Flagellar system: flagellin subunits pass through the flagellum, flagella are hollow, flagellin subunits grow from the tip via proteins. Flagella: flagella movement is derived from proton motive force (pmf, energy driven process (atp) Components of flagellated bacteria: filament (tail) containing flagellin proteins, hook protein portion, (cid:862)hooks(cid:863) filament to basal body, basal body, turns the filament like a propeller. Nonflagellar motility: gliding motility, smooth sliding over a surface, myxobacteria, cyanobacteria, twitching motility, slow, jerking process using pili that extend, attach to and pull along a surface, like a caterpillar.
