MCB 2610 Chapter Notes - Chapter 2 & 4: Fluid Mosaic Model, Hopanoids, Sterol
8 Sep 2016
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Avery welch mcb 2610 microbiology week 6-7 chapter 2 & 4 bacteria & archaea: fluid mosaic model of membrane structure. Membranes are lipid bilayers with floating proteins. Polar ends (hydrophilic interact with water) Non-polar tails (hydrophobic insoluble in water. Make up 20-30% of membrane proteins: integral. Amphipathic embedded within membrane, not easily extracted. Bacterial lipids: very dynamic saturation levels of membrane lipids reflect the environmental conditions such as temperature, bacterial membranes lack sterols but do contain sterol-like molecules, hopanoids. The cell membrane: critical structural and functional properties of bacterial cell envelope. Pm may have sterol molecules called hopanoids in it to help with stability across temperature ranges. O2 and co2 are small and can diffuse across readily. H2o is helped across by aquaporin protein channels. Osmosis is the flow of water across the pm toward the side with a higher solute (particle) concentration.
