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• W2023842096 abstract "The capability of strains of Pseudomonas ovalis (CFT1) and Pseudomonas tralucida (CFT4) to grow on hexachlorocyclohexane (HCH), a chlorinated pesticide, as sole source of carbon and energy is lost (though at a low frequency) by treatment with mitomycin C at a certain minimal inhibitory concentration (MIC). Presence of plasmid in HCH+ culture and loss of degradative pathway and physical presence of plasmid upon curing indicate the extrachromosomal location of HCH degradative genes in CFT1. Furthermore, the HCH+ degradation determinant of strains CM and CFT4 could be transferred to cured or to other HCH− Pseudomonads by conjugation without the transfer of any chromosomal marker of cooxidation of organochlorides. The metabolic activity, however, does not match the enormous quantity of the pesticides accumulated in nature over the years (Rajchengappa and Rajghatta, 1989,). It is, therefore, imperative to identify such gene clusters and clone these, after appropriate manipulations, so that better recombinants are developed. Plasmids specifying biodegradation of a number of aromatics, including chlorinated compounds, are now known (Rheinwald et al.1973Fisher et al., 1978Chatterjee et al., 1981). The degradative pathway for the organochlorides like 3 chlorobenzoate (3-CBA), 4-chlorobiphenyl, 2,4-dichlorophenoxyacetic acid (2,4-D) have been found to be controlled and expressed by an extrachromosomal gene cluster and plasmids bearing such clusters have been named ‘degradative plasmids’ (Chatterjee et al., 1981Furukawa and Chakrabarty, 1982Pemberton and Fisher, 1977). Such degradative plasmids have been identified mainly in strains of Pseudomonas species which are already known for nutritional versatility (Harayama and Don, 1979). The degradative plasmids are, by and large, conjugative types and their molecular sizes range from 40 to > 300 MDs (Hardman et al., 1986). The large molecular size of these plasmids contributes to the difficulty associated with their isolation in covalently closed circular form. Furthermore, due to the low copy number of these plasmids, in situ identification of plasmid bands in agarose gel preparations is generally not possible. Special care is, therefore, necessary for obtaining consistent results with regard to identification of the degradative plasmids. Inter- and/or intra-generic conjugational transfer of these degradative plasmids have often been taken as a confirmation of the presence of such plasmids in a bacterial species. In the present communication two bacterial species of Pseudonionas, capable of complete degradation of HCH, have been studied for the presence of plasmids and their conjugative character." @default.
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• W2023842096 date "1991-08-01" @default.
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• W2023842096 title "Evidence of plasmid mediated dechlorinase activity in Pseudomonas sps." @default.
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• W2023842096 doi "https://doi.org/10.1016/0168-1656(91)90036-u" @default.
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