BIOL 112 Lecture Notes - Lecture 7: Passive Transport, Molality, Membrane Transport Protein
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27 Apr 2017
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This flexibility is very important because the membrane is not only made up of phospholipids. There are also proteins and they have to move about in the membrane. Proteins are amphipathic/amphiphilic (they are both hydrophobic and hydrophilic). The non-polar amino acids are hydrophobic so they are inside of the bilayers. The hydrogen is inside the alpha helix of the amino acids so the lipids do not see them. However, the polar and charged amino acids are hydrophilic so they are on the lipid bilayer membrane on the outside with the rest of the hydrophilic molecules. Therefore, the protein cannot move up or down in the membrane, it can only move sideways. The outside the proteins have different amino acids than on the inside. A lot of proteins have to communicate with each other. Integral/trans membrane protein: they cross the entire membrane.
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