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. 1982 Jun;150(3):1115–1121. doi: 10.1128/jb.150.3.1115-1121.1982

Protein H encoded by plasmid CloDF13 is involved in excretion of cloacin DF13.

B Oudega, F Stegehuis, G J van Tiel-Menkveld, F K de Graaf
PMCID: PMC216331  PMID: 6281236

Abstract

Excretion of cloacin DF13 was studied in Escherichia coli cells harboring different CloDF13 insertion and deletion mutant plasmids. Insertions of a transposon at position 9.8 or 11.5% of the CloDF13 plasmid blocked the expression of gene H and strongly reduced the specific excretion of cloacin DF13 into the culture medium, but had no effect on the production of cloacin DF13. Insertions in or deletions of regions of the CloDF13 DNA upstream the cloacin operon did not affect the excretion or production of the bacteriocin. Introduction of a CloDF13 plasmid that encodes for the gene H product in cells harboring a CloDF13 plasmid with an insertion in gene H stimulated the excretion of cloacin DF13 significantly in mitomycin C-induced and in noninduced cultures. Cloacin DF13 in cloacinogenic cells that did not produce the gene H protein was found to be about 90% located in the cytoplasm. In cells that did produce the gene H product, about 30% of the cloacin DF13 molecules were found in the cytoplasm, about 18% were found in the periplasm, about 2% were in the membranes, and about 50% were located in the culture supernatant. Cyclic AMP stimulated the production but not the excretion of cloacin DF13 in cells cultivated in the presence of glucose.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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