Superior esterolytic activity in environmental Lactococcus lactis strains is linked to the presence of the SGNH hydrolase family of esterases
2020
Román Naranjo, Desirée | Callanan, Michael | Thierry, Anne | Mcauliffe, Olivia | Cork Institute of Technology (CIT) | Teagasc Food Research Centre [Fermoy, Ireland] | VistaMilk SFI Research Centre Moorepark, Fermoy ; Teagasc Food Research Centre [Fermoy, Ireland] | Science et Technologie du Lait et de l'Oeuf (STLO) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-INSTITUT AGRO Agrocampus Ouest ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)
International audience
显示更多 [+] 显示较少 [-]英语. We investigated the esterolytic activity of dairy- and environment-derived Lactococcus lactis strains through aquantitative esterase assay based on hydrolysis of p-nitrophenyl dodecanoate (PNP). In general, environmentalL. lactis strains had higher esterolytic activity than dairy strains. Comparative genome analysis revealed thepresence of an open reading frame related to esterolytic activity in the environmental strain L. lactis DPC6855(from corn), encoding the predicted product SGNH/GDSL hydrolase family protein. The 1,287-bp gene encodesa 428-amino acid SGNH/GDSL hydrolase. The presence of this gene in most of the environment-derived strainswas established by PCR; the gene was not found in the genome of L. lactis DPC6853 or in genomes of L. lactisstrains from dairy sources, suggesting a possible correlation between the SGNH hydrolase family and higheresterolytic activity. This work provides further evidence of more diverse genotypic and phenotypic traits inenvironmental compared with dairy L. lactis strains.
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