Abstract
Lactococcus lactis strains are widely used in the dairy industry in fermentation processes for production of cheese and fermented milks. However, the esterolytic activity of L. lactis is not generally considered high. For this reason, purified microbial lipases and esterases are often added in certain dairy processes to generate specific flavors in the final food product. This work demonstrates the superior esterolytic activity of a collection of L. lactis strains isolated from different environmental sources compared with that of dairy-derived strains. It provides further evidence of the more diverse metabolic capabilities displayed by L. lactis strains from environmental sources compared to their domesticated dairy counterparts. Furthermore, the presence of a 1,287-bp gene encoding a 428-amino acid SGNH hydrolase in the high-esterolytic environmental strains suggests a possible link between superior esterolytic activity and the presence of the esterase from the SGNH hydrolase family.
Highlights
SGNH hydrolase family of esterases may be linked to high esterolytic activity
Superior esterolytic activity in environmental Lactococcus lactis strains is linked to the presence of the SGNH hydrolase family of esterases
Environmental lactococcal strains exhibit certain adaptation capabilities such as higher tolerance to salt and alkaline conditions, high glutamate dehydrogenase (GDH) activity, and diverse metabolization of carbohydrates, including sugars usually found in plant environments such as arabinose and xylose, which has been demonstrated to affect the production of flavor compounds in certain dairy processes (Alemayehu et al, 2014; Cavanagh et al, 2014, 2015)
Summary
SGNH hydrolase family of esterases may be linked to high esterolytic activity Superior esterolytic activity in environmental Lactococcus lactis strains is linked to the presence of the SGNH hydrolase family of esterases This work demonstrates the superior esterolytic activity of a collection of L. lactis strains isolated from different environmental sources compared with that of dairyderived strains.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
