BI110 Lecture Notes - Lecture 13: Hydrophile, Amphiphile, Phospholipid
Document Summary
Cells need a barrier to regulate what goes in and out of the cell. Barrier must have the following qualities: impermeable to most molecules and ions, ability to exchange molecules/ions between compartments, insoluble in water (cannot dissolve in water for it to exist, permeable to water. Cell-to-cell interactions (holding cells together, communication, etc. ) Sterols (except in bacteria: cholesterol (animals, ergosterols (fungi, phytosterols (plants) as transport, integral proteins, peripheral membrane proteins. Membrane proteins (responsible for carrying out functions such. Made up of various lipids and proteins embedded in the lipid bilayer. Types: transport proteins, structural proteins (interacting with cytoskeleton, enzymes, cell-to-cell interaction proteins, cell communication proteins (also used as receptors for. Integral membrane proteins are amphipathic, containing both hydrophilic and hydrophobic amino acids (so they can interact with the different regions lipid bilayer) cell-to-cell and environmental communication) Hydrophobic domains in the trans-membrane region of an integral membrane protein stabilize it within the lipid bilayer.
