Class Notes (1,100,000)
US (490,000)
UMD (9,000)
BSCI (1,000)
Lecture 4

BSCI 283 Lecture Notes - Lecture 4: Atp Synthase, Signal Transduction, Listeria Monocytogenes


Department
Biological Sciences Program
Course Code
BSCI 283
Professor
Daniel Stein
Lecture
4

This preview shows half of the first page. to view the full 2 pages of the document.
Metabolism 2/13/17
Flagellar Orientations
o Amphitrichous-flagella at both ends
o Monotrichous-only one flagella
o Peritrichous-multiple flagella
Gliding Motility
o Requires surfactant
o No visible external apparatus
o Different species may use different mechanisms
o Cell body moves relative to adhesion sites
o Proteins form focal adhesion complexes
Movement by Actin Polymerization
o Intracellular pathogens move inside of host cells
o Ex. Shigella dysenteria, listeria monocytogenes
o Polymerizing strand of actin pushes bacteria
o Act A is protein produced by Listeria Stimulates actin polymerization on one
polestick pushes cell
Swimming
o Swimming by peritrichous bacteria
o Run and tumble
o Random movement, tumble to change direction
o
Metabolism
o Metabolism produces NADHproton gradientenergy to power motor
o Electron transport chain can generate PMF
o 9 protons per electron pairNADH
o oxygen is terminal electron acceptor
o 3ATP per NADH
o ATP synthase can reverse: hydrolyze ATPpump protons
o Taxis-directed movement
o Aerotaxis-cells attracted to oxygen
o Chemotaxis-response to chemical gradients
find more resources at oneclass.com
find more resources at oneclass.com
You're Reading a Preview

Unlock to view full version