alexa Characterization of the novel HCH-degrading strain, Microbacterium sp. ITRC1.
Environmental Sciences

Environmental Sciences

Journal of Bioremediation & Biodegradation

Author(s): Manickam N, Mau M, Schlmann M

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Abstract A gram-positive Microbacterium sp. strain, ITRC1, that was able to degrade the persistent and toxic hexachlorocyclohexane (HCH) isomers was isolated and characterized. The ITRC1 strain has the capacity to degrade all four major isomers of HCH present in both liquid cultures and aged contaminated soil. DNA fragments corresponding to the two initial genes involved in gamma-HCH degradative pathway, encoding enzymes for gamma-pentachlorocyclohexene hydrolytic dehalogenase (linB) and a 2,5-dichloro-2,5-cyclohexadiene-1,4-diol dehydrogenase (linC), were amplified by PCR and sequenced. Their presence in the ITRC1 genomic DNA was also confirmed by Southern hybridization. Sequencing of the amplified DNA fragment revealed that the two genes present in the ITRC1 strain were homologous to those present in Sphingomonas paucimobilis UT26. Both 16S rRNA sequencing and phylogenetic analysis resulted in the identification of the bacteria as a Microbacterium sp. We assume that these HCH-degrading bacteria evolved independently but possessed genes similar to S. paucimobilis UT26. The reported results indicate that catabolic genes for gamma-HCH degradation are highly conserved in diverse genera of bacteria, including the gram-positive groups, occurring in various environmental conditions. This article was published in Appl Microbiol Biotechnol and referenced in Journal of Bioremediation & Biodegradation

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