Topic #3 - Flagella & Motility Flashcards
Flagellin
Protein that makes up flagella. H antigen
Corkscrew Shape of flagella
Allows movement through liquids easily
Assembly - Where?
Assembly occurs at tip of flagella
Monotrichous (often also polar)
1 at one end
Amphitrichous
Flagella at both ends
Lophotrichous
Tuft or cluster of many at one end
Peritrichous - The Important ones
Many all over the cell (paramecium-like looking).
Counterclockwise rotation
Bug Runs forward
Clockwise rotation
Bug tumbles
Optimum flagella speed
60 lengths/second - faster than cheetah
Polarity and flagelular direction
CCW -> pushes forwards
CW -> pulls reverse
Gram+ Flagella
No L ring in motor
Gram- Flagella
Complex motor with many rings
Fli Proteins
Control direction (CCW/CW) - this is the “motor switch”
Mot (motility) proteins
Use PMF for turning