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Degradation of euptox A by tannase-producing rumen bacteria from migratory goats.

Abstract：

AIMS:The gut microbiota capable of degrading plant biomass and antinutritional phytometabolites are of immense importance. This study reports isolation and characterization of tannase-producing rumen bacteria that could also degrade euptox A (9-oxo-10,11-dehydroageraphorone) present in Eupatorium adenophorum (Spreng). METHODS AND RESULTS:Migratory Gaddi goats were selected as source of inoculums for isolating rumen bacteria with ability to produce tannase which catalyses degradation of hydrolysable tannins (HTs). Three rumen bacterial isolates producing tannase were studied, and identified as Klebsiella variicola strain PLP G-17 LC, K. variicola strain PLP S-18 and Klebsiella pneumoniae strain PLP G-17 SC. The isolates exhibited optimal tannase activity at 40°C, and pH 6·0. The bacteria could also degrade euptox A, a potent hepatotoxin in E. adenophorum Spreng, a widely distributed noxious weed. CONCLUSIONS:The rumen bacteria could degrade antinutritional HTs and euptox A. Culture-independent metagenomic interventions are envisioned to completely decipher the rumen microbial ecology and exploit its genetic and metabolic potential. SIGNIFICANCE AND IMPACT OF THE STUDY:The bacteria producing tannase which catalyses degradation of HTs, and concurrently degrading euptox A, may have potential as microbial feed additives to increase utilization of plant biomass containing antinutritional phytometabolites.

journal_name

J Appl Microbiol

journal_title

Journal of applied microbiology

authors

Sharma D,Mal G,Kannan A,Bhar R,Sharma R,Singh B

doi

10.1111/jam.13563

subject

Has Abstract

pub_date

2017-11-01 00:00:00

pages

1194-1202

issue

5

eissn

1364-5072

issn

1365-2672

journal_volume

123

pub_type

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