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The authors haveaddressed my concern about the missing proof for a true knock-out with a newPCR based experiment, showing basically two bands from wildtype and mutant,differing by the size of the Erythromycin gene insert. However, for a fulldesciption of the mutant construction some point are still missing:
First,can the authors verify that the plasmid is not replicating in the host strain?The cited literature does not provide this information, so a citation whichstates that ColE1 type replicons cannot replicate in Lactobacillus would benecessary. If this is not clear from the literature, additional experimentwould be needed to verify this.
Second, and related to the first point, usuallythe first step of a knock-out generation is the formation of a merodiploidafter a first homologous recombination, integrating the whole plasmid into thegenome. Usually a counterselection via a suicide gene on the plasmid is used,to select the true mutants from the merodiploids. This was obviously not donein this case, so the question remains, if the resulting strain is a knock-outor a merodiploid. A very easy test would be to screen the mutants for the presenceof the Amp gene, which is on the plasmid and would be gone in a true mutant.
Third, for characterization of a mutant, acomplementation experiment is necessary, to exclude downstream effects of theintroduced knock-out gene (EryR) on other genes. In this case a merodiploidwould be usful as here one intact copy of the gene is present followed by theintegrated plasmid, so downstream effects should be visible in a merodiploidwhile an effect of the gene knock-out should not be visible. Alternatively theauthors can perhaps use their pMG76e-mur plasmid to create a complementedmutant. In any case this complemented mutant should be included in thephenotypic testing and should behave more or less like the wildtype to provethat the observed effect is really due to the knock-out of the mur gene aloneand nothing else plays a role for the observed phenotype.
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