Abstract
1) Liver extract of a marine gastropod, Turbo cornutus, destroyed the pyocin-R receptor activity of the lipopolysaccharide of sensitive Pseudomonas aeruginosa.
2) The extract contained at least two factors, probably proteins, attacking the receptor; one attacking below pH 4 inactivated the receptor immediately and the other with optimum pH 6.2 inactivated the receptor gradually. The latter was partially purified and its properties are described. It was strongly inactivated by acetate buffer.
