Exploring methane-oxidizing communities for the co-metabolic degradation of organic micropollutants

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• 作者：Jessica Benner (1)
  Delfien De Smet (1)
  Adrian Ho (1) (4)
  Frederiek-Maarten Kerckhof (1)
  Lynn Vanhaecke (2)
  Kim Heylen (3)
  Nico Boon (1)
  
  1. Laboratory of Microbial Ecology and Technology (LabMET) ; Department of Biochemical and Microbial Technology ; Faculty of Bioscience Engineering ; Ghent University ; Coupure Links 653 ; 9000 ; Ghent ; Belgium
  4. Department of Microbial Ecology ; Netherlands Institute of Ecology (NIOO-KNAW) ; Droevendaalsesteeg 10 ; 6708 PB ; Wageningen ; The Netherlands
  2. Laboratory of Chemical Analysis ; Department of Veterinary Public Health and Food Safety ; Faculty of Veterinary Medicine ; Ghent University ; Salisburylaan 133 ; 9820 ; Merelbeke ; Belgium
  3. Laboratory of Microbiology (LM-UGent) ; Department of Biochemistry and Microbiology ; Faculty of Sciences ; Ghent University ; K.L. Ledeganckstraat 35 ; 9000 ; Ghent ; Belgium
  
• 关键词：Methanotrophs ; Sulfamethoxazole ; Benzotrialzole ; sMMO ; pMMO ; Copper
• 刊名：Applied Microbiology and Biotechnology
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：99
• 期：8
• 页码：3609-3618
• 全文大小：867 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Microbiology
  Microbial Genetics and Genomics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0614

文摘

Methane-oxidizing cultures from five different inocula were enriched to be used for co-metabolic degradation of micropollutants. In a first screening, 18 different compounds were tested for degradation with the cultures as well as with four pure methane-oxidizing bacterial (MOB) strains. The tested compounds included pharmaceuticals, chemical additives, pesticides, and their degradation products. All enriched cultures were successful in the degradation of at least four different pollutants, but the compounds degraded most often were sulfamethoxazole (SMX) and benzotriazole (BTZ). Addition of acetylene, a specific methane monooxygenase (MMO) inhibitor, revealed that SMX and BTZ were mainly degraded co-metabolically by the present MOB. The pure MOB cultures exhibited less degradation potential, while SMX and BTZ were also degraded by three of the four tested pure strains. For MOB, copper (Cu2+) concentration is often an important factor, as several species have the ability to express a soluble MMO (sMMO) if the Cu2+ concentration is low. In literature, this enzyme is often described to have a broader compound range for co-metabolic degradation of pollutants, in particular when it comes to aromatic structures. However, this study indicated that co-metabolic degradation of the aromatic compounds SMX and BTZ was possible at high Cu2+ concentration, most probably catalyzed by pMMO.