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Membrane teichoic acids, sometimes described as lipoteichoic acids, are important but not major components of nearly all Gram-positive bacteria. They appear on the outer surface of the cytoplasmic membrane and possess antigenic properties. Several functions have been ascribed to these glycerol phosphate polymers, including the binding of divalent cations required for optimal activity of membrane-bound enzymes, and the control of certain lytic enzymes. A substance that is identical or closely similar to membrane teichoic acid, lipoteichoic acid carrier, plays an important part in the biosynthesis of wall teichoic acid; it accepts polyol phosphate residues from CDP-glycerol or CDP-ribitol to form a polyol phosphate chain which is then transferred after the incorporation of a tri(glycerol phosphate) linkage unit, to the growing glycan chain of peptidoglycan.
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