BIO130H1 Lecture Notes - Lecture 10: Organism, Membrane Protein, Membrane Fluidity

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10 Oct 2016
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BIO130H1 Full Course Notes
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Can be saturated/unsaturated determining properties of the lipid bilayer as a whole. Kink indicates that the tail is unsaturated, contains a cis-double bond, and is not freely rotatable. In phosphatidylcholine, there is an example of one saturated tail and one unsaturated tail: steroids. Animals: mainly cholesterol, essential element of the membrane. Has a rigid steroid ring structure and a nonpolar hydrocarbon tail. Up to 1:1 ratio of cholesterol and phospholipids. Decreases mobility of phospholipid tails (stiffens them) Makes plasma membrane less permeable, changing the properties of the plasma membrane based on the amount of cholesterol: glycolipids: Lipids that are glycosylated in the lumen of the golgi apparatus. In the outer leaflet of the plasma membrane (with sugar group pointed on the outer (?)) Found in some organelles, pointing in the lumen of those organelles. E. g. cells lining intestines are heavily glycosylated to protect themselves from the harsh environment (from the stomach) A membrane can be deformed without causing damage.

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