There is provided a phospholipid composition which is a bilayer or micelle comprising at least one embedded protein-polymer surfactant conjugate comprising an anchor protein, wherein the anchor protein is a cationised protein or an anionised protein, the composition characterised in that the anchor protein is: a) an active enzyme; or b) is a protein which does not comprise a -CH2C(O)NCH3(CH2)3N(CH3)2H+ linker covalently bonded to an amino acid side chain.