Teichoic acid is also a receptor for certain phage. Gram-positive bacteria synthesize teichuronic acid in place of teichoic acid under phosphate-limited conditions.
Lipoteichoic acid has a similar structure to teichoic acid. Adiacylglycerol-containing sugar is attached to the terminal polyalcohol phosphate. This lipid part of lipoteichoic acid is embedded in the cytoplasmic membrane,while the polyalcohol phosphate partly constitutes the cell wall.
the gram-positive bacterial cell wall contains various proteins,including the autolytic enzymes mentioned above. They are attached to the cell wall though the action of an enzyme called sortase 6.9 after they are excreted through the cytoplasmic membrane. Their functions include 1 metabolism of cell surface structures,2 invasion into the host,3 hydrolysis of polymers such as proteins and polysaccharides and 4 adhesion to solid surface.