title: Mode of action of a lysostaphin-like bacteriolytic agent produced by Streptococcus zooepidemicus 4881.
abstract: Electron microscopy of zoocin A-treated sensitive streptococcus cells revealed cytoplasmic disruption and ultimately complete rupture of the cell wall. Culture viability and optical density were shown to decrease rapidly and simultaneously in Streptococcus pyogenes FF22 but less quickly in the relatively more resistant Streptococcus mutans 10449. Zoocin A was shown to cleave hexaglycine in a colorimetric cell-free microtiter assay system, and it is concluded that the killing action of zoocin A, like that of lysostaphin, is most probably the result of direct cleavage of the peptidoglycan cross-links in the cell wall. The relationship between sensitivity to zoocin A and the peptidoglycan cross-linkage structure of Streptococcus zooepidemicus, Lactococcus spp., S. pyogenes, Streptococcus gordonii, Streptococcus oralis, S. mutans, and Streptococcus rattus has been evaluated.
authors.affiliation: Department of Microbiology, University of Otago, Dunedin, New Zealand. robin.simmonds@stonebow.otago.ac.nz
authors.forename: R S
authors.initials: RS
authors.lastname: Simmonds
authors.forename: L
authors.initials: L
authors.lastname: Pearson
authors.forename: R C
authors.initials: RC
authors.lastname: Kennedy
authors.forename: J R
authors.initials: JR
authors.lastname: Tagg
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001433:Bacteriolysis; D010450:Endopeptidases / Q000378:metabolism; D008248:Lysostaphin / Q000494:pharmacology*; D010457:Peptidoglycan / Q000378:metabolism; D013291:Streptococcus / Q000378:metabolism*; D013295:Streptococcus mutans / Q000187:drug effects / Q000648:ultrastructure; D013297:Streptococcus pyogenes / Q000187:drug effects / Q000648:ultrastructure
chemical_list: D000900:Anti-Bacterial Agents; D010457:Peptidoglycan; D010450:Endopeptidases; D008248:Lysostaphin