Identification of genes encoding conjugated bile salt hydrolase and transport in Lactobacillus johnsonii 100-100.

ABSTRACT: Cytosolic extracts of Lactobacillus johnsonii 100-100 (previously reported as Lactobacillus sp. strain 100-100) contain four heterotrimeric isozymes composed of two peptides, alpha and beta, with conjugated bile salt hydrolase (BSH) activity. We now report cloning, from the genome of strain 100-100, a 2,977-bp DNA segment that expresses BSH activity in Escherichia coli. The sequencing of this segment showed that it contained one complete and two partial open reading frames (ORFs). The 3' partial ORF (927 nucleotides) was predicted by BLAST and confirmed with 5' and 3' deletions to be a BSH gene. Thermal asymmetric interlaced PCR was used to extend and complete the 948-nucleotide sequence of the BSH gene 3' of the cloned segment. The predicted amino acid sequence of the 5' partial ORF (651

SUBMITTER: Elkins CA 

PROVIDER: S-EPMC107440 | biostudies-literature | 1998 Sep

REPOSITORIES: biostudies-literature