The Lactobacillus Bile Salt Hydrolase Repertoire Reveals Niche-Specific Adaptation.

Abstract:

:Various Lactobacillus species have been reported to deconjugate bile acids in the gastrointestinal tract (GIT) through the action of bile salt hydrolase (BSH) proteins. This function contributes to altering the gut microbiota composition and bile metabolism and detoxification and to lowering cholesterol levels. Here, we investigated the Lactobacillus BSH repertoire across 170 sequenced species. We used hidden Markov models to distinguish between BSH and closely related penicillin-V acylase (PVA) proteins. Even though BSH and PVA proteins have very different target substrates, they share high sequence similarity and are often misannotated. We determined that 82/170 (48.24%) species encoded PVA proteins, 39/170 (22.94%) species encoded BSH proteins, and 8/170 (4.71%) species encoded both BSH and PVA proteins, while 57/170 (33.53%) species encoded neither. Mapping the occurrence of BSH-encoding species onto a phylogenetic tree revealed that BSH-encoding lactobacilli primarily adopt the vertebrate-adapted lifestyle but not the environmental or plant-associated subsets. Phylogenetic analysis of the BSH sequences revealed two distinct clades, several conserved motifs, and the presence of six previously reported active-site residues. These data will guide future mechanistic studies of BSH activity and contribute to the development and selection of BSH-encoding Lactobacillus strains with therapeutic potential.IMPORTANCE Bile acids play an integral role in shaping the gut microbiota and host physiology by regulating metabolic signaling, weight gain, and serum cholesterol and liver triglyceride levels. Given these important roles of bile acids, we investigated the presence of bile salt hydrolase (BSH) in Lactobacillus genomes representing 170 different species, determined strain- and species-specific patterns of occurrences, and expanded on the diversity of the BSH repertoire in this genus. While our data showed that 28% of Lactobacillus species encode BSH proteins, these species are associated mainly with vertebrate-adapted niches, demonstrating selective pressure on lactobacilli to evolve to adapt to specific environments. These new data will allow targeted selection of specific strains of lactobacilli and BSH proteins for future mechanistic studies to explore their therapeutic potential for treating metabolic disorders.

journal_name

mSphere

journal_title

mSphere

authors

O'Flaherty S,Briner Crawley A,Theriot CM,Barrangou R

doi

10.1128/mSphere.00140-18

subject

Has Abstract

pub_date

2018-05-30 00:00:00

issue

3

issn

2379-5042

pii

3/3/e00140-18

journal_volume

3

pub_type

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