title: In vitro investigation of molecules involved in Lactobacillus gasseri SBT2055 adhesion to host intestinal tract components.
abstract: OBJECTIVE
  The adhesion ability of Lactobacillus gasseri SBT2055 was investigated in vitro by searching for its adhesion molecules.
  
  
  RESULTS
  Lactobacillus gasseri SBT2055 showed adherence to host components, including two commercially available mucins, Caco-2 epithelial-like cells and the extracellular matrix molecule fibronectin (Fn). Its adhesion rates to host components were generally higher than those of other Lactobacillus strains. We examined sortase-dependent proteins (SDPs) anchored by a sortase enzyme encoded by srtA1. The adhesion rates of an srtA1 disruptant were lower than those of Lact. gasseri SBT2055, and the relative adherences were as follows: two mucins, 43 and 40%; Caco-2, 66% and Fn, 28%. Seven additional gene disruptants were generated to determine the precise SDPs that contribute to adhesion to each component.
  
  
  CONCLUSIONS
  The adhesion ability of Lact. gasseri SBT2055 was superior to those of other Lactobacillus strains. Additionally, four adhesion molecules were newly identified from candidate SDPs.
  
  
  CONCLUSIONS
  Although the contribution of SDPs to adhesion has been reported using sortase gene disruptants, this is the first report to identify the precise SDPs that act as adhesion molecules. Our results will contribute to achieving better understanding of probiotic bacterial adherence.
authors.affiliation: Milk Science Research Institute, Megmilk Snow Brand Co., Ltd., Kawagoe-shi, Saitama, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Arai
authors.affiliation: Milk Science Research Institute, Megmilk Snow Brand Co., Ltd., Kawagoe-shi, Saitama, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Obuchi
authors.affiliation: Milk Science Research Institute, Megmilk Snow Brand Co., Ltd., Kawagoe-shi, Saitama, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Eguchi
authors.affiliation: Milk Science Research Institute, Megmilk Snow Brand Co., Ltd., Kawagoe-shi, Saitama, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Seto
mesh_terms: D001422:Bacterial Adhesion; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D018938:Caco-2 Cells; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism; D007422:Intestines / Q000382:microbiology*; D000069998:Lactobacillus gasseri / Q000235:genetics / Q000502:physiology*; D009077:Mucins / Q000378:metabolism; D019936:Probiotics / Q000737:chemistry
chemical_list: D001426:Bacterial Proteins; D009077:Mucins
keywords: Lactobacillus gasseri; adhesion; gut retention; probiotics; sortase; sortase-dependent protein