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. 1991 Aug;173(15):4668–4674. doi: 10.1128/jb.173.15.4668-4674.1991

Expression of the iap gene coding for protein p60 of Listeria monocytogenes is controlled on the posttranscriptional level.

S Köhler 1, A Bubert 1, M Vogel 1, W Goebel 1
PMCID: PMC208143  PMID: 1906869

Abstract

Expression of the iap gene of Listeria monocytogenes encoding a major extracellular protein (p60) was analyzed. Different start sites for transcription of the iap gene were identified by primer extension analysis in L. monocytogenes and in a recombinant Escherichia coli clone. The mutant RIII of L. monocytogenes represents a member of the frequently occurring L. monocytogenes R mutants, which form cell chains and produce greatly reduced amounts of p60. However, the concentrations of iap-specific mRNA were similar in mutant RIII and the wild-type strain. The introduction of additional copies of the iap gene from wild-type L. monocytogenes led to an equal increase of iap mRNA in both strains, but overexpression of protein p60 was only observed in the wild-type strain. The nucleotide sequences of both iap genes and their 5' noncoding regions were identical in all parts that are essential for efficient transcription of the iap gene, translation of the iap-specific mRNA, and transport of the p60 protein. These data suggest that the expression of the iap gene in L. monocytogenes is controlled on the posttranscriptional level by a specific factor that is defective in mutant RIII.

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