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Title: Efficient Metabolic Exchange and Electron Transfer within a Syntrophic Trichloroethene-Degrading Coculture of Dehalococcoides mccartyi 195 and Syntrophomonas wolfei

Journal Article · · Applied and Environmental Microbiology
DOI:https://doi.org/10.1128/AEM.03464-14· OSTI ID:1512089
 [1];  [1];  [1];  [1];  [2]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Dehalococcoides mccartyi195 (strain 195) andSyntrophomonas wolfeiwere grown in a sustainable syntrophic coculture using butyrate as an electron donor and carbon source and trichloroethene (TCE) as an electron acceptor. The maximum dechlorination rate (9.9 ± 0.1 μmol day-1) and cell yield [(1.1 ± 0.3) × 108cells μmol-1Cl-] of strain 195 maintained in coculture were, respectively, 2.6 and 1.6 times higher than those measured in the pure culture. The strain 195 cell concentration was about 16 times higher than that ofS. wolfeiin the coculture. Aqueous H2concentrations ranged from 24 to 180 nM during dechlorination and increased to 350 ± 20 nM when TCE was depleted, resulting in cessation of butyrate fermentation byS. wolfeiwith a theoretical Gibbs free energy of -13.7 ± 0.2 kJ mol -1. Carbon monoxide in the coculture was around 0.06 μmol per bottle, which was lower than that observed for strain 195 in isolation. The minimum H2 threshold value for TCE dechlorination by strain 195 in the coculture was 0.6 ± 0.1 nM. Cell aggregates during syntrophic growth were observed by scanning electron microscopy. The interspecies distances to achieve H2 fluxes required to support the measured dechlorination rates were predicted using Fick's law and demonstrated the need for aggregation. Filamentous appendages and extracellular polymeric substance (EPS)-like structures were present in the intercellular spaces. The transcriptome of strain 195 during exponential growth in the coculture indicated increased ATP-binding cassette transporter activities compared to the pure culture, while the membrane-bound energy metabolism related genes were expressed at stable levels.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1512089
Journal Information:
Applied and Environmental Microbiology, Vol. 81, Issue 6; ISSN 0099-2240
Publisher:
American Society for MicrobiologyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Cited By (9)

Interspecies metabolite transfer in a co-culture of Dehalococcoides and Sulfurospirillum leads to rapid and complete tetrachloroethene dechlorination posted_content December 2020
Membrane Complexes of Syntrophomonas wolfei Involved in Syntrophic Butyrate Degradation and Hydrogen Formation journal November 2016
An integrated meta-omics approach reveals substrates involved in synergistic interactions in a bisphenol A (BPA)-degrading microbial community journal February 2019
An integrative overview of genomic, transcriptomic and proteomic analyses in organohalide respiration research journal January 2018
Effects of Sulfate Reduction on Trichloroethene Dechlorination by Dehalococcoides-Containing Microbial Communities journal February 2017
Acetylenotrophy: a hidden but ubiquitous microbial metabolism? journal May 2018
Hydrogen production by Sulfurospirillum species enables syntrophic interactions of Epsilonproteobacteria journal November 2018
Synthetic microbial consortia for biosynthesis and biodegradation: promises and challenges journal July 2019
Interspecies metabolite transfer and aggregate formation in a co-culture of Dehalococcoides and Sulfurospirillum dehalogenating tetrachloroethene to ethene journal January 2021

Figures / Tables (8)


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