Abstract:
:Downstream from the ptsHI operon of Lactobacillus sakei, the genes atkY and atkB, organized in an operon, were observed. The two putative proteins, AtkB and AtkY, show sequence similarity to the Enterococcus hirae copper P-type ATPase, responsible for copper efflux, and its negative regulator. Characterization of AtkB as a copper P-type ATPase could not be demonstrated since an atkB mutant did not show any phenotype. Thus, another strategy was followed in order to investigate the transcriptional regulation of the atkYB locus, leading to the development of new genetic tools for L. sakei. A plasmid was constructed, the use of which allowed gene replacement at the lacLM locus in L. sakei by two successive crossovers. A strain deleted of the lacLM operon encoding the beta-galactosidase of L. sakei was constructed by this method, and the Escherichia coli lacZ gene could then be used as a reporter gene to investigate the regulation of atkYB. Results show that the atkYB operon is induced by small concentrations of CuSO(4) (30 to 40 microM) but not when CuSO(4) is omitted or added at higher concentrations.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Stentz R,Loizel C,Malleret C,Zagorec Mdoi
10.1128/aem.66.10.4272-4278.2000keywords:
subject
Has Abstractpub_date
2000-10-01 00:00:00pages
4272-8issue
10eissn
0099-2240issn
1098-5336journal_volume
66pub_type
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