Peripheral membrane protein
Peripheral membrane proteins are located on the peripheral regions of the lipid biliayer of biological membranes. Examples of peripheral membrane proteins are proteins involved in electron transport chains, such as cytochrome c, cupredoxins, high potential iron protein, adrenodoxin reductase, some flavoproteins, and others.
Other peripheral membrane proteins are the carriers of non-polar compounds that facilitate transport of phosphatidylinositol, tocopherol, gangliosides, glycolipids, sterol derivatives, retinol, or fatty acids.
Word origin: peripheral < periphery: LL peripherīa < Gk periphéreia circumference, lit., a bearing round + -al.