BIOL 204 Lecture Notes - Lecture 25: Peripheral Membrane Protein, Lipid Bilayer, Alpha Helix
2 Apr 2018
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Document Summary
Unsaturated fatty acids are produced during fatty acid synthesis by enzymes desaturases. Unsaturated are originally fully saturated with no double bonds until desaturases catalyze a reaction to remove 2 hydrogen atoms and induce a double bond. Foods that have saturated fatty acids are more stable, longer shelf life, higher melting temperature. Sterols influence membrane fluidity: act as membrane buffers trans, the cis bonds that do not become hydrogenated are reconfigured into, ex. Membrane proteins 4 functions: are involved in cell-cell recognition. Proteins can either be: integral membrane proteins, peripheral membrane proteins. Are trans membrane proteins span the entire bilayer. Have regions of nonpolar amino acids coiled into alpha helices. Hydrophobic amino acids about 17-20 in length. Positioned on surface of membrane (cytoplasmic side) Held with non covalent bonds (hydrogen & ionic) Can hold some integral proteins in place. Made of polar and nonpolar amino acids.
