Comparative genomics and proteolytic enzymatic analysis of lactobacillus helveticus reveals strain biodiversity

Qi Yanran; Liu Xiaoming

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Comparative genomics and proteolytic enzymatic analysis of lactobacillus helveticus reveals strain biodiversity

Qi Yanran,Liu Xiaoming *

College of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China

*Correspondence author

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Funding: National Natural Science Foundation of China （No.31871829）, Agricultural Science and Technology Innovation Fund of Jiangsu Province （No.CX(17)1005）, National First-Class Discipline Program of Food Science and Technology （No.JUFSTR20180102）

Opened online:19 March 2019

Accepted by: none

Citation: Qi Yanran,Liu Xiaoming.Comparative genomics and proteolytic enzymatic analysis of lactobacillus helveticus reveals strain biodiversity[OL]. [19 March 2019] http://en.paper.edu.cn/en_releasepaper/content/4747771

Lactobacillus helveticus is a starter culture in the manufacture of Swiss cheese, Italian aged cheeses, and fermented milk products. Its growth relies on a complex proteolytic system that includes cell-envelope proteinases (CEPs) and peptidases. There were only a few strains of L. helveticus whose proteolytic systems in terms of genotype and phenotype have been characterized. In this study, a phylogenetic configuration and a pan/core genome analysis and an evaluation of the proteolytic enzymatic activities were conducted for 50 trains of L. helveticus including 38 isolated from various ecological niches in our lab. Three L. helveticus strains formed a phylogenetic lineage that was clearly separated from the other strains based on the phylogenetic tree, with the genome sizes from 1.798 to 2.255 Mbp. Diversity in key enzymatic activities was observed among L. helveticus strains. This study provides insight into the genetic and phenotypic diversity of L. helveticus isolated from various environments and the potential application in fermented dairy products.

Keywords: Lactobacillus helveticus; Comparative genomics; Proteinase; Diversity

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