Interactions between DDT and river fungi

Hodkinson, Madeline; Dalton, Sheri

doi:10.1007/bf01721002

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Several studies have addressed the effects of organic pollutants on aquatic hyphomycetes in the field and the laboratory, with pesticides being most frequently investigated among pollutants with defined chemical structures. Here, we briefly present only effects of major relevance because they have been reviewed and summarized previously (Hodkinson, 1976; Bärlocher, 1992a; Sridhar & Raviraja, 2001; Krauss et al , 2003a).…”

Section: Physiological and Biochemical Versatility Allows Aquatic Funmentioning

confidence: 99%

“…Similarly, the growth of the terrestrial fungi Aureobasidium pullulans, Cephalosporium acremonium, Cladosporium cladosporioides and Cylindrocarpon orthosporium , which were isolated from aquatic habitats, was affected (summarized by Hodkinson, 1976). Furthermore, DDT was found to increase the respiratory quotients of various sugars in H. submersus , indicating that the insecticide inhibits aerobic oxidation of sugars and shifts the catabolism to anaerobic fermentation (Hodkinson, 1976). Like terrestrial species, aquatic hyphomycetes accumulate DDT (Hodkinson, 1976).…”

Section: Physiological and Biochemical Versatility Allows Aquatic Funmentioning

confidence: 99%

“…Furthermore, DDT was found to increase the respiratory quotients of various sugars in H. submersus , indicating that the insecticide inhibits aerobic oxidation of sugars and shifts the catabolism to anaerobic fermentation (Hodkinson, 1976). Like terrestrial species, aquatic hyphomycetes accumulate DDT (Hodkinson, 1976). Pentachlorophenol was also reported to accumulate in mycelia of aquatic hyphomycetes.…”

Section: Physiological and Biochemical Versatility Allows Aquatic Funmentioning

confidence: 99%

“…4). The further metabolic fates of metabolites formed from various xenobiotics by aquatic hyphomycetes and other mitosporic freshwater isolates (Hodkinson, 1976; Augustin et al , 2006; Martin et al , 2007, 2009; Junghanns et al , 2008) remain open.…”

Section: Physiological and Biochemical Versatility Allows Aquatic Funmentioning

confidence: 99%

“…Pollutant attack by aquatic hyphomycetes via reductive reactions is suggested by the reported formation of the metabolite 1,1‐dichloro‐2,2‐bis(4′‐chlorophenyl)ethane (DDD) from DDT. Within 330 h, H. submersus converted DDT into DDD at 27% and into 1,1‐dichloro‐2,2‐bis(4′ ‐ chlorophenyl)ethylene (DDE) at 8%, whereas C. aquatica transformed 6% of DDT into these metabolites (Hodkinson, 1976). Reductive dechlorination is well known from anaerobic bacteria, but has also been reported for terrestrial fungi (Reddy & Gold, 1999).…”

Section: Physiological and Biochemical Versatility Allows Aquatic Funmentioning

confidence: 99%

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Fungi in freshwaters: ecology, physiology and biochemical potential

et al. 2011

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Research on freshwater fungi has concentrated on their role in plant litter decomposition in streams. Higher fungi dominate over bacteria in terms of biomass, production and enzymatic substrate degradation. Microscopy-based studies suggest the prevalence of aquatic hyphomycetes, characterized by tetraradiate or sigmoid spores. Molecular studies have consistently demonstrated the presence of other fungal groups, whose contributions to decomposition are largely unknown. Molecular methods will allow quantification of these and other microorganisms. The ability of aquatic hyphomycetes to withstand or mitigate anthropogenic stresses is becoming increasingly important. Metal avoidance and tolerance in freshwater fungi implicate a sophisticated network of mechanisms involving external and intracellular detoxification. Examining adaptive responses under metal stress will unravel the dynamics of biochemical processes and their ecological consequences. Freshwater fungi can metabolize organic xenobiotics. For many such compounds, terrestrial fungal activity is characterized by cometabolic biotransformations involving initial attack by intracellular and extracellular oxidative enzymes, further metabolization of the primary oxidation products via conjugate formation and a considerable versatility as to the range of metabolized pollutants. The same capabilities occur in freshwater fungi. This suggests a largely ignored role of these organisms in attenuating pollutant loads in freshwaters and their potential use in environmental biotechnology.

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Section: Physiological and Biochemical Versatility Allows Aquatic Funmentioning

confidence: 99%

Section: Physiological and Biochemical Versatility Allows Aquatic Funmentioning

confidence: 99%

Section: Physiological and Biochemical Versatility Allows Aquatic Funmentioning

confidence: 99%

Section: Physiological and Biochemical Versatility Allows Aquatic Funmentioning

confidence: 99%

Section: Physiological and Biochemical Versatility Allows Aquatic Funmentioning

confidence: 99%

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Fungi in freshwaters: ecology, physiology and biochemical potential

et al. 2011

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Human Interference

Bärlocher¹

1992

The Ecology of Aquatic Hyphomycetes

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Purification and biochemical characterization of a laccase from the aquatic fungus Myrioconium sp. UHH 1-13-18-4 and molecular analysis of the laccase-encoding gene

Martín

Pecyna

Kellner

et al. 2007

Appl Microbiol Biotechnol

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Myrioconium sp. strain UHH 1-13-18-4 is an ascomycete anamorph isolated from the river Saale, Central Germany. An extracellular, monomeric, and glycosylated laccase with a molecular mass of 72.7 kDa as determined by matrix-assisted laser desorption/ionization-time of flight-mass spectrometry and an isoelectric point below 2.8 was purified from CuSO(4) and vanillic acid amended liquid fungal cultures grown in malt extract medium. The catalytic efficiencies (k(cat)/K(m)) for the oxidation of syringaldazine, 2,6-dimethoxyphenol, and 2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonate) were 67.3, 46.9, and 28.2 s(-1) mM(-1), respectively, with K(m) values of 4.2, 67.8, and 104.9 microM. After pre-incubation at different pH values and temperatures for 1 h, more than 80% of the initial laccase activity was retained between pH 4 to 6 and 15 degrees C. The laccase-encoding gene was identified and sequenced at both the genomic and complementary DNA (cDNA) level, and corresponding structural characteristics and putative regulatory elements of the promoter region are reported. The identification of two tryptic peptides of the purified enzyme by mass spectrometry confirmed the identity of the functional laccase protein with the translated genomic sequence of the Myrioconium sp. laccase. Myrioconium sp. laccase shows the highest degree of identity with laccases from ascomycetes belonging to the family Sclerotiniaceae, order Helotiales.

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Interactions between DDT and river fungi

Cited by 6 publications

References 8 publications

Fungi in freshwaters: ecology, physiology and biochemical potential

Fungi in freshwaters: ecology, physiology and biochemical potential

Human Interference

Purification and biochemical characterization of a laccase from the aquatic fungus Myrioconium sp. UHH 1-13-18-4 and molecular analysis of the laccase-encoding gene

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