Biology 2382B Lecture Notes - Glycosylphosphatidylinositol, Transmembrane Domain, Lipid Bilayer
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26 Apr 2013
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With the exception of needing phospholipids to form semi-permeable closed compartments, membrane proteins carry out the biological functions of membranes. Integral: part of the membrane, when part of the membrane are potentially going through the membrane their orientation will always be the same. Lipid-linked: linked to lipids that are already present on the membrane. Peripheral: proetins that are not directly linked to the plasma membrane, are not binded directly to the membrane bind to a protein on the plasma membrane and in doing so is linked to it. Asymmetric: specifically oriented it will always be the same orientation! Three distinct domains: cystopalsmic (hydrophillic, transmembrane (hydrophobic, exoplasmic (hydrophilic) Transmembrane domain: hydrophobic secondary or tertiary structures that span the lipid bilayer. Alpha helicies a row of amino acids that will span the plasma membrane (must be hydrophobic) (20-25 amino acids) Arg and lys (charged aas) near cytosolic side interact with polar head groups.
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