BIOL 3305 Lecture Notes - Lecture 9: Thalassinidea, Peripheral Membrane Protein, Transmembrane Protein
Document Summary
At higher temperatures, move more freely, and make the membrane more fluid. (cid:131) composition of the membrane (cid:120) length of the fatty acid chains and the degree of saturation. Shorter chains (mix of short and long) pack less well and give higher fluidity. Unsaturated have double bonds which causes a kink, causes them to not pack together well, increases fluidity. (there is at least one double bond present. ) In general, the more fluid the membrane, the more double bonds are present. (cid:131) head groups that are present (cid:120) cylindrical in shape, lower fluidity (phosphotitolcholine. And cone shape, which spreads out, doesn"t pack nicely, raises fluidity (phosphotitolethanolanine. Head group). (cid:131) where there are sterols (cid:120) have a four ringed framework, much more rigid and stiff than a fatty acid chain. At high temperatures, stiffness is an advantage, decreases fluidity. At low temperatures, unpack, increases fluidity of membrane. Spends summer in arctic and spends winter in.
