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Digestion of Tannin by Bacteria Enterobacter cloacae from the Gut of Indian Mole Cricket (Gryllotalpa krishnani) | OMICS International | Abstract
ISSN: 2155-9821

Journal of Bioprocessing & Biotechniques
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Research Article

Digestion of Tannin by Bacteria Enterobacter cloacae from the Gut of Indian Mole Cricket (Gryllotalpa krishnani)

Rasiravuthanahalli KG1, Seemaisamy Revathi1, Neelamegam Rameshkumar2, Muthukalingan Krishnan2 and Nagarajan Kayalvizhi1*

1Department of Zoology, School of Life Sciences, Periyar University, Salem, Tamil Nadu, India

2Insect Molecular Biology Laboratory, Department of Environmental Biotechnology, Bharathidasan University, Tiruchirappalli, Tamil Nadu, India

*Corresponding Author:
Nagarajan Kayalvizhi
Department of Zoology, School of Life Sciences
Periyar University, Salem, Tamil Nadu, India
Tel: 04272345328
E-mail: [email protected] (or) [email protected]

Received Date: February 01, 2017; Accepted Date: March 22, 2017; Published Date: March 25, 2017

Citation: Rasiravuthanahalli KG, Revathi S, Rameshkumar N, Krishnan M, Kayalvizhi N (2017) Digestion of Tannin by Bacteria Enterobacter cloacae from the Gut of Indian Mole Cricket (Gryllotalpa krishnani). J Bioprocess Biotech 7: 302. doi:10.4172/2155-9821.1000302

Copyright: © 2017 Rasiravuthanahalli KG, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Insects are the most successful animal on earth; the gut microbes present might play an important role in food digestion as well as the interaction with hosts. In this study insect Gryllotalpa krishnani has been used to isolate the symbiotic associated organisms which play role in host metabolism, promote efficient digestion and to protect the host from the harmful microbes. In the present study, microorganisms were isolated from the gut of G. krishnani and characterized for tannase enzyme activity. It was observed that 5 isolates (TAH 6, TAH 13, TAH 36, TAH 38 and TAH 41) out of total 120 tested were able to show significant growth on tannic acid plate. Among these five potential isolates, strain TAH 41 exhibited maximum tannase activity in tannase plate assay and was selected for the further study. The bacterial strain TAH41 was analyzed for biochemical analysis, 16S rDNA sequencing and the result confirmed the strain as Enterobacter cloacae. HPLC analysis showed the formation two peaks representing gallic acid and glucose as a by-product FT-IR analysis also confirmed the same. The polyacrylamide gel electrophoresis (SDS-PAGE) and zymogram analysis showed the molecular mass of tannase enzyme in cell free extract was ~45 kDa, the analysis suggested this tannase enzyme to be one of the smallest of the bacterial source, which could be attributed to the formation of di or tri‑galloyl glucose. The present study was the first report E. cloacae with tannase activity from G. krishnani gut. E. cloacae which may endow the insect with some ecological advantages by enabling them to overcome the anti-nutritional effects of plant tannins.