The taxonomic composition, characteristics, and neurotoxic activities of ribbon worm-associated bacteria from the Sea of Japan
Tóm tắt
The taxonomic composition of bacteria associated with two species of tetrodotoxin-bearing (TTX-bearing) (Hubrechtella juliae and Lineus alborostratus) and two species of non-TTX-bearing (Quasitetrastemma stimpsoni and Malacobdella grossa) ribbon worms collected from the Peter the Great Bay of Sea of Japan was studied. Bacterial isolates were identified using 16S rRNA gene sequencing and phenotypic characteristics. Thirty-eight strains of heterotrophic bacteria from the eight genera: Pseudoalteromonas, Shewanella, Ruegeria, Pseudomonas, Defluviicoccus, Vibrio, Alteromonas, and Bacillus, were isolated and characterized. γ-Proteobacteria dominated among the associated microflora of nemerteans (76.3% of the total number of isolates). Sensitivity analysis of 38 strains to antibiotics of various classes revealed multiple resistance to three or more antibiotics in all of the studied isolates. The 15 bacterial strains isolated in the study exhibited antimicrobial activities against at least one of five indicator microorganisms, most of which corresponded to the Pseudoalteromonas genus. Screening of the TTX-producing bacteria was performed using confocal laserscanning microscopy and polyclonal antibodies. A TTX-producing strain, Pseudoalteromonas sp., was found in the nemertean H. juliae. A correlation between the presence of TTX-positive microflora and the toxicity of nemerteans was determined.
Tài liệu tham khảo
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