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Two homologous oligopeptide binding protein genes (oppA) in Lactococcus lactis MG1363

Sanz, Y., Lanfermeijer, F. C., Hellendoorn, M., Kok, J., Konings, W. N. & Poolman, B., 2004, In : International Journal of Food Microbiology. 97, 1, p. 9 - 15 7 p.

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DOI

In previous studies, it has been shown that inactivation of opp or even oppA abolishes the capacity of Lactococcus lactis to utilize oligopeptides. We now show that the opp operon has been duplicated in L. lactis MG1363. The nucleotide sequence of the oppA and oppC homologues (appA and appC) and most of the oppB homologue (appB) indicate that the corresponding protein sequences are 83%, 92% and 91% identical, respectively. Inactivation of appA, via homologous recombination, as well as complementation studies were carried out to determine the possible function of appA in peptide utilization. As anticipated from studies with an oppA knock-out, peptide utilization was not impaired in an appA disruption mutant. Importantly, AppA expressed from a plasmid could restore the ability of oppA deletion mutants to utilize Leu-enkephalin, albeit with a lower efficiency than OppA. The differences in the ability to utilize this pentapeptide were not due to differences in expression levels but most likely reflect a different catalytic efficiency in oligopeptide utilization when AppA is used as ligand receptor.
Original languageEnglish
Pages (from-to)9 - 15
Number of pages7
JournalInternational Journal of Food Microbiology
Volume97
Issue number1
Publication statusPublished - 2004

    Keywords

  • Gene complementation, Gene duplication, Oligopeptide transport system, Lactococcus lactis

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