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Isolation and characterization of Magnetospirillum from saline lagoon

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Abstract

Magnetotactic bacteria (MTB) are aquatic prokaryotes that orient themselves to earth’s magnetic field with the help of intracellular organelle magnetosomes. Although many species of MTB have been identified, the isolation of MTB is a challenging task due to the lack of systematic isolation procedure and/or commercial media. In this study, we are reporting the isolation of magnetotactic spirillum from the Pulicat lagoon, India using a systematic and selective procedure. Sampling site was chosen on the basis of physicochemical properties of the ecosystem and the catalysed reporter deposition fluorescence in situ hybridization (CARD–FISH) analysis of sediment samples. In the current study, a combination of techniques including ‘capillary racetrack’ Purification and gradient cultivation resulted in the isolation of magnetotactic spirilla from aquatic sediments. Based on the 16S rRNA gene sequence analysis, the strain was identified as Magnetospirillum and was designated as Magnetospirillum sp. VITRJS1. The genes responsible for magnetosome formation (mamA, B, E, F, K, M, O, P, Q, T) were successfully detected using PCR amplification. The presence of cbbM gene confirmed that the isolate is chemolithoautotroph and utilises reduced sulphur as an electron source. Furthermore, magnetosomes extracted from VITRJS1 found to be cubo-octahedral in shape and 45 nm in size. Our results indicate that the systematic procedure using sediment analysis, CARD–FISH, and a combination of isolation methods enables the selective and rapid isolation of MTB from aquatic sediment sample.

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Acknowledgments

This research was supported under Fast Track Scheme for Young Scientists SERB, DST, Govt. of India (SR/FT/LS-11/2012). The authors also thank the VIT University for providing necessary infrastructure and Dr. Ramesh, Dean-CIF, TANUVAS, Chennai for helping in TEM images.

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  1. Marine Biotechnology and Bioproducts Lab, School of Biosciences and Technology, VIT University, Vellore, 632014, Tamilnadu, India

    T. Revathy, Jobin John Jacob, M. A. Jayasri & K. Suthindhiran

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  1. T. Revathy
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Correspondence to K. Suthindhiran.

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Revathy, T., Jacob, J.J., Jayasri, M.A. et al. Isolation and characterization of Magnetospirillum from saline lagoon. World J Microbiol Biotechnol 32, 109 (2016). https://doi.org/10.1007/s11274-016-2075-7

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