Choline-containing bacteriophage receptors in Streptococcus pneumoniae.
Choline-containing teichoic acid seems to be essential for the adsorption of bacteriophage Dp-1 to pneumococci. This conclusion is based on the following observations: In contrast to pneumococci grown in choline-containing medium, cells grown in medium containing ethanolamine or other submethylated aminoalcohols instead of choline were found to be resistant to infection by Dp-1. Live choline-grown bacteria and heat- or UV-inactivated cells and purified cell walls prepared from these cells were capable of adsorbing phage Dp-1; ethanolamine-grown pneumococci or cell wall preparations were unable to do so. Adsorption of Dp-1 to choline-containing cell walls was competitively inhibited by phosphorylcholine and by several choline-containing soluble cell surface components, such as the Forssman antigen and the teichoic acid-glycan complexes formed by autolytic cell wall degradation. Cell walls prepared from pneumococci grown in ethanolamine or phosphorylethanolamine were inactive. Electron microscopic studies with pneumococci that had segments of choline-containing cell wall material amid ethanolamine-containing regions indicated that the Dp-1 phage particles adsorbed exclusively to the choline-containing surface areas. We suggest that the choline residues of the pneumococcal teichoic acid are essential components of the Dp-1 phage receptors in this bacterium.
D000327:Adsorption; D001435:Bacteriophages / Q000502:physiology; D002794:Choline / Q000032:analysis* / Q000502:physiology; D011991:Receptors, Virus / Q000032:analysis* / Q000502:physiology; D013296:Streptococcus pneumoniae / Q000032:analysis* / Q000502:physiology; D013682:Teichoic Acids / Q000032:analysis*
D011991:Receptors, Virus; D013682:Teichoic Acids; D002794:Choline