Above the temperature at which lipids are fluid, membrane proteins are able to move

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Above the temperature at which lipids are fluid, membrane proteins are able to move laterally in the plane of a membrane. This is due to the increased fluidity of the lipid bilayer and the decreased packing of the lipid tails, making it easier for proteins to move within the membrane. Movement from inner to outer surfaces of a membrane (A) or from apical to basal surfaces of intestinal epithelial cells (C) is not related to the fluidity of the membrane and is dependent on other factors. Movement of membrane proteins does not require attachment to microtubules or microfilaments (D).

Above the Temperature at Which Lipids Are Fluid, Membrane Proteins