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• Bioengineering •     Next Articles

Adhesion characteristics and carbohydrate metabolism pathway analysis of three Lacticaseibacillus paracasei strains from different sources based on genome sequencing analysis

Luyao Xiao 2, 2,Wei Li   

  • Received:2023-05-07 Revised:2023-11-15 Online:2024-01-25 Published:2024-02-02
  • Contact: Wei Li E-mail:lw1981@njau.edu.cn

Abstract: Lacticaseibacillus paracasei ZY-1was derived from Tibetan kefir grains, L. paracasei S-NA5 and L. paracasei S-NB was isolated from Xinjiang traditional fermented milk. In this study, the surface characteristics and adhesion properties of the three strains were evaluated in vitro, while the difference of adhesion-related genes was analyzed and compared based on the whole genome sequencing. The gastrointestinal tolerance and adhesion properties of L. paracasei S-NB were superior to S-NA5 and ZY-1. Moreover, two exopolysaccharide (EPS) synthesis gene clusters were found in all of the three strains, while the EPS cluster 1 of strain ZY-1 differed significantly from those of S-NA5 and S-NB. Meanwhile, genes involved in lipoteichoic acid (LTA) synthesis and related domains of protein adhesins were predicted. The secondary structure of 11 adhesive proteins was dominated by α helix and random curling, according to the results of the secondary structure prediction analysis of the adhesive protein gene coding products from strain S-NB. Additionally, complete metabolic pathways of lactose, galactose, fructi-oligosaccharide, inulin and human milk oligosaccharides were found in three strains, which were highly conserved.

Key words: Lacticaseibacillus paracasei, intestinal adhesion, genome sequencing, adhesion factors, carbohydrate metabolism pathway

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