while the composition of membranes varies with their source, they generally contain approximately 40% of their dry weight as lipid and 60% as protein, held together in a complex by non-covalent interactions. Usually carbohydrate is present to the extent of 1–10% of the total dry weight. This is covalently bonded either to lipid or to protein, and the carbohydrate-containing molecules will be considered as lipids or proteins as appropriate. In addition to the above components, membranes contain some 20% of their total weight as water, which is tightly bound and essential to the maintenance of their structure.
KeywordsLipid Bilayer Sialic Acid Polar Lipid Membrane Component Steryl Ester
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