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Studies of colicin action on wall‐less stable L‐forms of Escherichia coli II. Growth inhibition of complete and wall‐less (L‐form) cells of Escherichia coli by basic colicin types
Author(s) -
Šmarda J.,
Schuhmann† Edith
Publication year - 1985
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.3620250711
Subject(s) - colicin , escherichia coli , cytoplasm , cell wall , protoplast , biology , cell , receptor , cell membrane , biophysics , microbiology and biotechnology , biochemistry , gene
The inhibitive activity of colicins of 16 types (produced by 22 colicinogenic strains) on rods and protoplast‐like stable L‐form cells of the strains Escherichia coli B, W1655 F + and W1655 F − was compared. The results of 58 combinations tested fall into four groups (with three subgroups): 1) both cell forms are sensitive a) both cell forms are about equally sensitive b) rods are distinctly more sensitive than L‐form cells c) L‐form cells are distinctly more sensitive than rods2) only rods are sensitive, L‐form cells are not sensitive 13) only L‐form cells are sensitive rodsare not sensitive 4) neither cell form is sensitive.Group la represents simple sensitivity; both cell wall and cytoplasmic membrane receptors are present and functioning. Groups 1b and 2 represent sensitivity, substantially or completely mediated by cell wall receptors. Groups 1 c and 3, represent partial or complete “pseudoresistance” or “pseudotolerance”; cell wall receptors are absent or non‐lethal, but cytoplasmic membrane ones are present and mediate the lethal effect. Group 4 represents both true resistance and true tolerance.