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Teachable Tidbit: Mobility of membrane lipids and proteins I.Pre-assessment group discussion II.Lecture/discussion/ Experimental examples III.Post unit assessment: problem set and quiz

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The fluid mosaic model for biological membranes: A lipid bilayer within which integral membrane proteins are inserted into and through the bilayer, but unless restrained, free to move within the plane of the membrane.

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Topic/unit objective: Understanding the nature of and functional significance of the dynamics of lipids and proteins in biological membranes Pre-unit assessment goal: How would you demonstrate the mobility of lipids and/or proteins in biological membranes? CRAZY IDEAS WELCOME: Fluid Mosaic Model for Biological Membranes

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I.Modes of lipid mobility; factors that affect mobility II.Topographic organization of biological membrane proteins III.Lateral mobility of integral membrane proteins I.Frye and Edidin experiment demonstrating lateral mobility of cell surface proteins in mouse/human heterokaryons II.Antibody capping of cell surface membrane proteins III.Kinetic analysis of lateral membrane protein mobility: FRAP and FLIP analysis IV.Modes of regulating membrane protein mobility

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Fluorescence Recovery after Photobleaching (FRAP)

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Fluorescence recovery after photobleaching

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Nuclear lamina on inner surface of frog egg nucleus. Lamin dimers

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