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SUMMARY: In Lactobacillus casei S-1, d-galactosamine and l-rhamnose comprised a phage receptor for phage J-1. A mixture of d-galactosamine and l-rhamnose effectively inactivated phage J-1, and a J-1-resistant mutant strain, L. casei S-1/J-1, lacked d-galactosamine in its surface component. The phage-inactivating effects of d-galactosamine and l-rhamnose were strongly dependent on the concentration of each substance and on temperature.
It is suggested that the receptor for phage J-1 involves both d-galactosamine in the cytoplasmic membrane and l-rhamnose in the wall of the host bacterium L. casei s-1, which lacks teichoic acid in its wall.
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