RRC ID 5371
著者 Ito Y, Kawai Y, Arakawa K, Honme Y, Sasaki T, Saito T.
タイトル Conjugative plasmid from Lactobacillus gasseri LA39 that carries genes for production of and immunity to the circular bacteriocin gassericin A.
ジャーナル Appl Environ Microbiol
Abstract Gassericin A is a circular bacteriocin produced by Lactobacillus gasseri strain LA39. We found a 33,333-bp plasmid, designated pLgLA39, in this strain. pLgLA39 contained 44 open reading frames, including seven genes related to gassericin A production/immunity (gaa), as well as genes for replication, plasmid maintenance, and conjugative transfer. pLgLA39 was transferred from LA39 to the type strain of L. gasseri (JCM 1131) by filter mating. The transconjugant exhibited >30-fold-higher more resistance to gassericin A and produced antibacterial activity. Lactobacillus reuteri LA6, the producer of reutericin 6, was proved to harbor a plasmid indistinguishable from pLgLA39 and carrying seven genes 100% identical to gaa. This suggests that pLgLA39 might have been transferred naturally between L. gasseri LA39 and L. reuteri LA6. The seven gaa genes of pLgLA39 were cloned into a plasmid vector to construct pGAA. JCM 1131(T) transformed with pGAA expressed antibacterial activity and resistance to gassericin A. pGAA was segregationally more stable than a pGAA derivative plasmid from which gaaA was deleted and even was more stable than the vector. This suggests the occurrence of postsegregational host killing by the gaa genes. pLgLA39 carried a pemIK homolog, and segregational stabilization of a plasmid by the pLgLA39-type pemIK genes was also confirmed. Thus, pLgLA39 was proved to carry the genes for at least two plasmid maintenance mechanisms, i.e., gaa and pemIK. Plasmids containing a repA gene similar to pLgLA39 repA were distributed in several L. gasseri strains.
巻・号 75(19)
ページ 6340-51
公開日 2009-10-1
DOI 10.1128/AEM.00195-09
PII AEM.00195-09
PMID 19666732
PMC PMC2753081
MeSH Anti-Bacterial Agents / biosynthesis* Bacteriocins / biosynthesis* Bacteriocins / genetics Cloning, Molecular Conjugation, Genetic* DNA, Bacterial / chemistry DNA, Bacterial / genetics Drug Resistance, Bacterial* Gene Order Genes, Bacterial* Lactobacillus / drug effects Lactobacillus / genetics* Molecular Sequence Data Open Reading Frames Plasmids* Sequence Analysis, DNA Sequence Homology, Amino Acid Transformation, Bacterial
IF 4.016
引用数 31
WOS 分野 BIOTECHNOLOGY & APPLIED MICROBIOLOGY MICROBIOLOGY
リソース情報
一般微生物 JCM1131 JCM1130 JCM5344 JCM8787