Abstract
Iron-containing liquid cultures of the brown-rot basidiomycete Gloeophyllum striatum degraded 2-fluorophenol. Two simultaneously appearing degradation products, 3-fluorocatechol and catechol, were identified by gas chromatography and mass spectrometry (GC-MS). Concomitantly, fluoride was produced at approximately 50% of the amount that theoretically could be achieved upon complete dehalogenation. Defluorination was strongly inhibited in the presence of either the hydroxyl radical scavenger mannitol or superoxide dismutase, as well as in the absence of iron. The addition of the natural iron chelator oxalate caused a clear but less extensive inhibition, whereas supplementation with the artificial iron chelator nitrilotriacetic acid increased fluoride production. Extracellular 2-fluorophenol degradation was evidenced by defluorination, observed upon addition of 2-fluorophenol to cell-free culture supernatants derived from iron-containing fungal cultures. Ultrafiltered culture supernatants oxidized methanol to formaldehyde, known as a product of the reaction of methanol with hydroxyl radical. In addition, G. striatum was found to produce metabolites extractable with ethyl acetate that are capable of reducing Fe3+. GC-MS analysis of such extracts revealed the presence of several compounds. The mass spectrum of a prominent peak matched those previously reported for 2,5-dimethoxyhydroquinone and 4,5-dimethoxycatechol, fungal metabolites implicated to drive hydroxyl radical production in Gloeophyllum. Taken together, these findings further support an extracellular Fenton-type mechanism operative during halophenol degradation by G. striatum.
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References
Backa S, Gierer J, Reitberger T, Nilsson T (1992) Hydroxyl radical activity in brown rot fungi studied by a new chemiluminescence method. Holzforschung 46:61–67
Bondar VS, Boersma MG, van Berkel WJH, Finkelstein ZI, Golovlev EG, Baskunow BP, Vervoort J, Golovleva LA, Rietjens IMCM (1999) Preferential oxidative dehalogenation upon conversion of 2-halophenols by Rhodococcus opacus 1G. FEMS Microbiol Lett 181:73–82
Elstner EF (1990) Der Sauerstoff. Biochemie, Biologie, Medizin. Wissenschaftsverlag, Mannheim, pp 22–40
Espejo E, Agosin E (1991) Production and degradation of oxalic acid by brown-rot fungi. Appl Environ Microbiol 57:1980–1986
Fahr K, Wetzstein H-G, Grey R, Schlosser D (1999) Degradation of 2,4-dichlorophenol and pentachlorophenol by two brown-rot fungi. FEMS Microbiol Lett 175:127–132
Finkelstein ZI, Baskunow BP, Boersma MG, Vervoort J, Golovlev EG, van Berkel WJH, Golovleva LA, Rietjens IMCM (2000) Identification of fluoropyrogallols as new intermediates in biotransformation of monofluorophenols in Rhodococcus opacus 1cp. Appl Environ Microbiol 66:2148–2153
Gierer J, Yang E, Reitberger T (1992) The reactions of hydroxyl radicals with aromatic rings in lignins, studied with creosol and 4-methylveratrol. Holzforschung 46:495–504
Grey R, Höfer C, Schlosser D (1998) Degradation of 2-chlorophenol and formation of 2-chloro-1,4-benzoquinone by mycelia and cell-free crude culture liquids of Trametes versicolor in relation to extracellular laccase activity. J Basic Microbiol 38:371–382
Halliwell G, Gutheridge JMC (1999) Free radicals in biology and medicine, 3rd edn. Oxford Press, Oxford, UK
Hamazaki S, Okada S, Li J-L, Toyoku S, Midorikawa O (1989) Oxygen reduction and lipid peroxidation by iron chelates with special reference to ferric nitrilotriacetate. Arch Biochem Biophys 272:10–17
Hammel KE, Kapich AN, Jensen KA Jr, Ryan ZC (2002) Reactive oxygen species as agents of wood decay by fungi. Enzyme Microb Technol 30:445–453
Hofrichter M, Bublitz B, Fritsche W (1994) Unspecific degradation of halogenated phenols by the soil fungus Penicillium frequentans Bi 7/2. J Basic Microbiol 34:163–172
Hyde SM, Wood PM (1997) A mechanism for the production of hydroxyl radicals by the brown-rot fungus Coniophora putanea: Fe(III) reduction by cellobiose dehydrogenase and Fe(II) oxidation at a distance from the hyphae. Microbiology 143:259–266
Jarosz-Wilkolazka A, Fink-Boots M, Malarczyk E, Leonowicz A (1998) Formaldehyde as a proof and response to various kind of stress in some basidiomyctes. Acta Biol Hung 49:393–403
Jensen KA Jr, Houtman CJ, Ryan ZC, Hammel KE (2001) Pathways for extracellular Fenton Chemistry in the brown-rot basidiomycete Gloeophyllum trabeum. Appl Environ Microbiol 67:2705–2711
Jensen KA Jr, Ryan ZC, Van den Wymelenberg A, Cullen D, Hammel KE (2002) An NADH:quinone oxidoreductase active during biodegradation by the brown-rot basidiomycete Gloeophyllum trabeum. Appl Environ Microbiol 68:2699–2703
Kamada F, Suzuna A, Hiratsuka N, Wariishi H, Tanaka H (2002) Mineralization of aromatic compounds by brown-rot basidiomycetes—mechanisms involved in initial attack on the aromatic ring. Microbiology 148:1939–1946
Käßbohrer J, Hennig I, Kreisel G (1999) Methode zum Screening von Photokatalysatoren durch einen chemischen Schnelltest. GIT Fachz Lab 12:1318–1320
Kerem Z, Jensen KA, Hammel KE (1999) Biodegradative mechanisms of the brown-rot basidiomycete Gloeophyllum trabeum: evidence for an extracellular hydroquinone-driven Fenton reaction. FEBS Lett 446:49–54
Koenigs JW (1974) Hydrogen peroxide and iron: a proposed system for decomposition of wood by brown-rot basidiomycetes. Wood Fiber 66:66–80
Marr J, Kremer S, Sterner O, Anke H (1996) Transformation and mineralization of halophenols by Penicillium simplicissimum SK9117. Biodegradation 7:165–171
Newcombe D, Paszczynski A, Gajewska W, Kröger M, Feis G, Crawford R (2002) Production of small molecular weight catalysts and the mechanism of trinitrotoluene degradation by several Gloeophyllum species. Enzyme Microb Technol 30:506–517
Paszczynski A, Crawford R, Funk D, Goodell B (1999) De novo synthesis of 4,5-dimethoxycatechol and 2,5-dimethoxyhydroquinone by the brown-rot fungus Gloeophyllum trabeum. Appl Environ Microbiol 65:674–679
Peelen S, Rietjens IMCM, Boersma MG, Vervoort J (1995) Conversion of phenol derivatives to hydroxylated products by phenol hydroxylase from Trichosporon cutaneum. A comparison of regioselectivity and rate of conversion with calculated molecular orbital substrate characteristics. Eur J Biochem 227:284–291
Schlosser D, Fahr K, Karl W, Wetzstein H-G (2000) Hydroxylated metabolites of 2,4-dichlorophenol imply a Fenton-type reaction in Gloeophyllum striatum. Appl Environ Microbiol 66:2479–2483
Schmid S, Krajnik P, Quint RM, Solar S (1997) Degradation of monochlorophenols by γ-irradiation. Radiat Phys Chem 50:493–502
Shimada M, Akamatsu Y, Tokimatsu T, Mii K, Hattori T (1997) Possible biochemical roles of oxalic acid as a low molecular weight compound involved in brown-rot and white-rot wood decays. J Biotechnol 53:103–113
Tornberg K, Olsson S (2002) Detection of hydroxyl radicals produced by wood-decomposing fungi. FEMS Microbiol Ecol 1340:1–8
Welch KD, Davies TZ, Aust SD (2002) Iron autoxidation and free radical generation: effects of buffers, ligands, and chelators. Arch Biochem Biophys 397:360–369
Wetzstein H-G, Schmeer N, Karl W (1997) Degradation of the fluoroquinolone enrofloxacin by the brown rot fungus Gloeophyllum striatum: identification of metabolites. Appl Environ Microbiol 63:4272–4281
Wetzstein H-G, Stadler M, Tichy H-V, Dalhoff A, Karl W (1999) Degradation of ciprofloxacin by basidiomycetes and identification of metabolites generated by the brown-rot fungus Gloeophyllum striatum. Appl Environ Microbiol 65:1556–1563
Wunderwald U, Hofrichter M, Kreisel G, Fritsche W (1998) Transformation of difluorinated phenols by Penicillium frequentans Bi 7/2. Biodegradation 8:379–385
Zhou X, Mopper K (1990) Determination of photochemically produced hydroxyl radicals in seawater and freshwater. Mar Chem 30:71–88
Acknowledgements
We thank H.-G. Wetzstein (Leverkusen) for sharing the G. striatum experimental system with us and for friendship over long years. We further greatly acknowledge the excellent technical assistance of A. Orthaus (Jena) and the help of C. Struppe (Jena) in GC-MS analysis. This work was supported by the UFZ Center for Environmental Research Leipzig-Halle. The experiments presented in this study comply with current laws in Germany.
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Kramer, C., Kreisel, G., Fahr, K. et al. Degradation of 2-fluorophenol by the brown-rot fungus Gloeophyllum striatum: evidence for the involvement of extracellular Fenton chemistry. Appl Microbiol Biotechnol 64, 387–395 (2004). https://doi.org/10.1007/s00253-003-1445-x
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DOI: https://doi.org/10.1007/s00253-003-1445-x