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. 1994 Sep;176(17):5350–5356. doi: 10.1128/jb.176.17.5350-5356.1994

Detection and subcellular localization of three Ptl proteins involved in the secretion of pertussis toxin from Bordetella pertussis.

F D Johnson 1, D L Burns 1
PMCID: PMC196720  PMID: 8071211

Abstract

The ptl locus of Bordetella pertussis contains eight open reading frames which are predicted to encode proteins (PtlA to PtlH) that are essential for secretion of pertussis toxin from the bacterium and which are members of a family of transport proteins found in other types of bacteria. We have detected PtlE, PtlF, and PtlG in immunoblots of extracts of B. pertussis by using antibodies raised to fusion proteins consisting of maltose-binding protein and the individual Ptl proteins. These proteins have apparent molecular weights similar to those predicted by DNA sequence analysis. Cell fractionation studies indicated that all three Ptl proteins are associated with the membranes of B. pertussis, suggesting that the Ptl proteins form a gate or channel which facilitates transport of pertussis toxin. Cell extracts of other Bordetella spp. were probed with antibodies to Ptl proteins for the presence of these transport proteins. Neither Bordetella parapertussis nor Bordetella bronchiseptica contained detectable levels of PtlE or PtlF. This lack of detectable Ptl protein may provide an explanation for previous observations which indicated that introduction of the genes encoding pertussis toxin subunits from B. pertussis into other Bordetella spp. results in production of the toxin but not secretion of the toxin.

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