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. 1991 Mar;59(3):1043–1049. doi: 10.1128/iai.59.3.1043-1049.1991

Identification of a new operon involved in Listeria monocytogenes virulence: its first gene encodes a protein homologous to bacterial metalloproteases.

J Mengaud 1, C Geoffroy 1, P Cossart 1
PMCID: PMC258365  PMID: 1705239

Abstract

The region flanking the transposon in a Tn1545-induced lecithinase-negative mutant of Listeria monocytogenes EGD was cloned and sequenced. The transposon had inserted in ORF D, the open reading frame previously identified downstream from hlyA, the gene encoding listeriolysin O. The complete sequence of ORF D from strain EGD has been determined as well as that of two other strains: LO28, a clinical isolate; and LM8, an epidemic strain. ORF D is 1,533 bp long and encodes a protein highly homologous to metalloproteases of bacilli, Serratia sp., Legionella pneumophila, and Pseudomonas aeruginosa. It was renamed prtA. Northern RNA blot analysis indicated that prtA is the first gene of a 6-kb operon, suggesting that the lecithinase-negative phenotype of the mutant might be due to a polar effect of the transposon insertion.

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Selected References

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