Membrane Proteins: Structure and Organization
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Membrane proteins are those which are integral to, or associated with, the various lipid membranes within and around cells.
Membrane proteins are classified by their method of attachment into four main groups: integral, peripheral, partially penetrating, and lipid-anchored. Additionally, integral proteins can be further divided by the type of fold they possess – either alpha-helical or beta-barrel. These proteins have been challenging to study due to their hydrophobic nature and low natural abundance.