BIOL130 Lecture Notes - Lecture 6: Phosphatidylethanolamine, Phosphatidylserine, Phosphatidylinositol
12 Aug 2017
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Unit 6: biological membranes - october 20, 25. Phospholipids are named from their head groups, fatty acids can be interchanged. Fatty acid chains are always facing each other inside, while the polar head is. The ease at which molecules move within leaflets is known as membrane fluidity. It is very hard to move through leaflets, as the polar head would have to go through the fatty acid tails. The organization of the bilayer is spontaneous. Fluidity is the kinetic energy driven by heat. The warmer it is the more movement there is and the more fluid the membrane will be. As the temperature gets cooler, there will be less movement and decrease until the fatty acid tails stick together and the membrane gels" (solidifies) Transition temperature: the temperature at which a membrane gels". Alter the alignment of fatty acids (less packed) Eg. add kinks (remove hydrogen), trim tails, more double bonds, modify the cholesterol.
