Membranes Structure and Function 10.9

Membranes Structure and Function 10.9 - Membrane Structure...

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Membrane Structure and Function
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The cell defines ‘self’ and establishes order within its boundaries by setting up selectively permeable membranes that serve as barriers and gateways between cell and external environment and different compartments within the cell
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Focus of Lecture Historical perspective on membrane organization – Fluid Mosaic Model Membrane lipids (phosphoglycerides, spingolipids, cholesterol) Properties of the lipid core Membrane proteins (integral, peripheral, lipid-anchored Membrane carbohydrates
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We Now Know That ….Evidence? All biological membranes – plasma, nuclear, mitochondrial – animal or plant – have essentially the same structure and organization Membranes are continuous, unbroken sheets of 2 monolayers of lipid molecules associated with protein
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Insights Into the Organization of Membranes
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The Plasma Membrane Contains a Lipid Bilayer
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Insight Into the Organization of the Plasma Membrane - TEM Unit membrane model
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The Plasma Membrane Is A Fluid Mosaic
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Motility in the Plasma Membrane
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Membrane Lipids Form the core structure of membranes – the membrane’s backbone; Phospholipids are the most abundant of lipids in membranes; the lipid molecule is amphipathic with hydrophillic (water- loving) and hydrophobic (water-fearing) ends Provide barrier to prevent water soluble substances (polar, charged) from entering and leaving the cell
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Types of Membrane Lipids Phosphoglycerides (phospholipids with and without choline or without other head groups); glycerol-based Sphingolipids (formed from an amino
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This note was uploaded on 11/09/2011 for the course CELL BIO & 270 taught by Professor Hart during the Fall '08 term at Rutgers.

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Membranes Structure and Function 10.9 - Membrane Structure...

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