[Adsorbed receptors for Erwinia carotovor subsp. carotovora macromolecular bacteriocins]

Study of nature of receptors for macromolecular bacteriocins Erwinia carotovora subsp. carotovora has shown that lipopolysaccharide (LPS) of cell membrane is an attaching structure for them. It has been established that enzymic treatment of LPS preparation with its further deproteinization by phenol is necessary for isolation of biologically active lipopolysaccharide. The process of absorption by LPS has been studied quantitatively and it has been shown that it is a low-efficient receptor as compared with LPS included in the native cell membranes. An approach has been proposed for the first time to the estimation of monosaccharide composition of LPS-receptor based on relations between bacteriocin sensitivity and content of monosaccharides. Study of six strains of E. carotovora subsp. carotovora from different sources has shown that the structure of LPS-receptors includes mannose, fucose, xylose, ramnose and two lipophylic monosaccharides of unknown nature. A conclusion has been made that S-LPS (0-chain) is that part which contains the sites of attachment of macromolecular carotovoricins.