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MEMBRANE PROTEINS (lipid anchored membrane proteins (type of peripheral…

- - - - glycan can vary
      - PE bound to glycan (blue) via a mannose residue
      - protein covalently bound to phosphoethanolamine residue
      - glycan bound to phosphoinositol (red) via a glucosamine residue
- - - - whereas the polar residues point inwards
      - the non-polar residues lie on the outside of the barrel
      - outer surface of the β-barrel of porin is hydrophobic whereas the inner core is hydrophilic and water-filled
- - - - antiparallel strands of amino acids form a β–sheet which folds to form a hollow cylinder
      - porin from the outer membranes of gram-ve bacteria such as E. coli
    - - bacteriorhodopsin has seven
- - - - expressed as a diffusion coefficient
    - - a lipid molecule can diffuse up to 2 µm in 1 second
      - viscosity of a membrane is similar to olive oil (100x > water)
  - - - immobile proteins may act as barriers, restricting the mobility of others
      - resulting in membrane domains where the composition differs from surrounding areas