Diffusion_ppt - The Cell Membrane hospholipids Fatty acid...

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Unformatted text preview: The Cell Membrane hospholipids Fatty acid Phosphate ¡ Phosphate head ¢ hydrophilic ¡ Fatty acid tails ¢ hydrophobic ¡ Arranged as a bilayer I want you to remember: Structure and function! “repelled by water” “attracted to water” rranged as a Phospholipid bilayer polar hydrophilic heads nonpolar hydrophobic tails polar hydrophilic heads ¡ Serves as a cellular barrier / border H 2 O sugar lipids salt waste impermeable to polar molecules ell membrane defines cell ¡ Cell membrane separates living cell from aqueous environment ¢ thin barrier = 8nm thick ¡ Controls traffic in & out of the cell ¢ allows some substances to cross more easily than others ¡ hydrophobic (nonpolar) vs. hydrophilic (polar) ermeability to polar molecules? ¡ Membrane becomes semi-permeable via protein channels ¢ specific channels allow specific material across cell membrane inside cell outside cell sugar aa H 2 O salt NH 3 ell membrane is more than lipids… ¡ Transmembrane proteins embedded in phospholipid bilayer ¢ create semi-permeabe channels lipid bilayer membrane protein channels in lipid bilyer membrane 2007-2008 Why are proteins the perfect molecule to build structures in the cell membrane? Classes of amino acids What do these amino acids have in common ? nonpolar & hydrophobic Classes of amino acids What do these amino acids have in common? polar & hydrophilic I like the polar ones the best! roteins domains anchor molecule ¡ Within membrane ¢ nonpolar amino acids ¡ hydrophobic ¡ anchors protein into membrane ¡ On outer surfaces of membrane in fluid ¢ polar amino acids ¡ hydrophilic ¡ extend into extracellular fluid & into cytosol Polar areas of protein Nonpolar areas of protein NH 2 H + COOH Cytoplasm Retinal chromophore Nonpolar (hydrophobic) α-helices in the cell membrane H + Porin monomer β-pleated sheets Bacterial...
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This note was uploaded on 09/22/2010 for the course ABD. 39283 taught by Professor Dr.met during the Spring '10 term at Aachen University of Applied Sciences.

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Diffusion_ppt - The Cell Membrane hospholipids Fatty acid...

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