Abstract
The sensitivity of Salmonella typhimurium as well as of Escherichia coli to the bacteriophage Ox2 was found to require, in addition to the OmpA protein, a certain type of rough LPS. Heptoseless mutants were resistant and unable to adsorb the phage. Mutants with less defective LPS chemotype were sensitive and could, except the second most defective chemotypes, adsorb Ox2. However, isolated LPS-free OmpA protein could bind the phage, and this binding could not be increased by adding LPS.
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