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. 1990 Nov;58(11):3770–3778. doi: 10.1128/iai.58.11.3770-3778.1990

Isolation of Listeria monocytogenes small-plaque mutants defective for intracellular growth and cell-to-cell spread.

A N Sun 1, A Camilli 1, D A Portnoy 1
PMCID: PMC313727  PMID: 2172168

Abstract

To dissect the regulatory and structural requirements for Listeria monocytogenes intracellular growth and cell-to-cell spread, we designed a protocol based on transposon mutagenesis and the isolation of mutants which form small plaques in monolayers of mouse L2 cell fibroblasts. Two different transposable elements were used to generate libraries of insertion mutants: Tn916 and a derivative of Tn917-lac, Tn917-LTV3. Ten classes of mutants were isolated and evaluated for growth and cell-to-cell spread in J774 mouse macrophagelike cells, Henle 407 human epithelial cells, and mouse bone marrow-derived macrophages. Mutants were also evaluated for secretion of hemolysin and phospholipase (assayed by egg yolk opacity) and association with F-actin in the cytoplasm of cells, using NBD-phallacidin staining. The ten classes of mutants included (i) mutants showing abortive intracellular and extracellular growth; (ii) mutants showing abortive intracellular growth; (iii) rough mutants; (iv) mutants showing greatly reduced hemolysin and phospholipase secretion but showing normal growth in cells and little or no association with F-actin; (v) mutants with mutations mapping to an open reading frame (ORF) adjacent to hlyA and referred to as ORF U, lacking phospholipase activity, and with 50% normal hemolysin activity; (vi) mutants with reduced secretion of both hemolysin and phospholipase; (vii) nonhemolytic mutants with mutations mapping to the structural gene, hlyA; (viii) mutants with 25% normal hemolysin secretion and absolutely no association with F-actin; (ix) mutants with mutations mapping to ORF U, lacking phospholipase activity, and with normal hemolysin activity; and (x) mutants showing a mixed-plaque morphology but normal for all other parameters.

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Selected References

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