MMG301 1nd Edition Lecture 12Outline of Last Lecture I. Components of the bacterial cell wallII. Gram positive bacteriaIII. Gram negative bacteriaIV. Functions of the LPSOutline of Current Lecture II. Surface layersIII. Cytoplasmic membraneIV. Cell walls of archaeaCurrent Lecture-surface layers (S)-outermost layer of the cell envelope-completely covers the cell-protective coat with uniform porosity-the cytoplasmic membrane-phospholipid bilayer-ester linkage in bacteria and eukarya-ether linkage in archaea (hint: ether and archaea both have h’s in them, just a trick to help you remember)-integral membrane proteins-outer face (OF): exposed to periplasm-inner face (IF): exposed to cytoplasm-transmembrane proteins (T): span the entire lipid bilayer (hence the name trans membrane)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-fluid membrane: allows lateral movement of proteins-functions of the bacterial cytoplasmic membrane-permeability barrier: prevents leakage into or out of the cell; serves as a gateway for nutrient transport into or out of the cell-protein anchor-energy production: site of generation and use of the proton motive force (where ATP is synthesized)-nutrient transport across the cytoplasmic membrane-simple transporter: single membrane protein-group translocation: series of proteins; solute is phosphorylated during transport-ABC transporter: three or more proteins; process involves consumption of ATP-cell walls of archaea-not made of peptidoglycan-no outer membrane-three main types of cell walls1. S layer (most common)2. psuedomurein (pseudo – peptidoglycan) (in certain methanogens)3. other
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