Eg bacterium can incorporate more unsaturated fa at

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Unformatted text preview: n unsaturated 27 + Membrane Fluidity ! Biological membranes composed of many types of lipids !  Fluidity maintained over range of T !  Can alter types of fatty acid chains to improve/limit fluidity !  E.g. bacterium can incorporate more unsaturated FA at low T 28 + Membrane Fluidity ! Biological membranes composed of many types of lipids !  Cholesterol influences fluidity !  Rigid and planar structure !  Restricts lipid movement and # fluidity in fluid state !  Prevents close packing of lipids in crystalline form – this actually " fluidity of crystalline state !  Works like fluidity “buffer” Polar group 29 + Membrane Fluidity ! May be local regions of membrane that are nearly crystalline !  Lipid rafts !  Contain cholesterol and sphingolipids http://en.wikibooks.org/wiki/ Structural_Biochemistry/Lipids/Lipid_Rafts 30 + Lipid Bilayer Translocation !  Lipids move laterally easily (some limitations) !  Lipids move between monolayers less frequently !  Why? !  Depends on type of lipid ! ...
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