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Title: Fungi contribute critical but spatially varying roles in nitrogen and carbon cycling in acid mine drainage

Journal Article · · Frontiers in Microbiology
 [1];  [1];  [1];  [2];  [3];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [2];  [4];  [1]
  1. Univ. of California, Berkeley, CA (United States)
  2. US Dept. of Energy Joint Genome Institute, Walnut Creek, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

© 2016 Mosier, Miller, Frischkorn, Ohm, Li, LaButti, Lapidus, Lipzen, Chen, Johnson, Lindquist, Pan, Hettich, Grigoriev, Singer and Banfield. The ecosystem roles of fungi have been extensively studied by targeting one organism and/or biological process at a time, but the full metabolic potential of fungi has rarely been captured in an environmental context. We hypothesized that fungal genome sequences could be assembled directly from the environment using metagenomics and that transcriptomics and proteomics could simultaneously reveal metabolic differentiation across habitats. We reconstructed the near-complete 27 Mbp genome of a filamentous fungus, Acidomyces richmondensis, and evaluated transcript and protein expression in floating and streamer biofilms from an acid mine drainage (AMD) system. A. richmondensis transcripts involved in denitrification and in the degradation of complex carbon sources (including cellulose) were up-regulated in floating biofilms, whereas central carbon metabolism and stress-related transcripts were significantly up-regulated in streamer biofilms. These findings suggest that the biofilm niches are distinguished by distinct carbon and nitrogen resource utilization, oxygen availability, and environmental challenges. An isolated A. richmondensis strain from this environment was used to validate the metagenomics-derived genome and confirm nitrous oxide production at pH 1. Overall, our analyses defined mechanisms of fungal adaptation and identified a functional shift related to different roles in carbon and nitrogen turnover for the same species of fungi growing in closely located but distinct biofilm niches.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-10ER64996; SC0004918; AC02-05CH11231; AC05-00OR22725
OSTI ID:
1257271
Alternate ID(s):
OSTI ID: 1326500; OSTI ID: 1379136
Journal Information:
Frontiers in Microbiology, Vol. 7; ISSN 1664-302X
Publisher:
Frontiers Research FoundationCopyright 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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Fungi in Biofilms of Highly Acidic Soils book July 2019
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Community Composition of Nitrite Reductase Gene Sequences in an Acid Mine Drainage Environment journal August 2019
Interactions among microfungi and pyrite-chalcopyrite mineralizations: tolerance, mineral bioleaching, and metal bioaccumulation journal March 2019
The genome of opportunistic fungal pathogen Fusarium oxysporum carries a unique set of lineage-specific chromosomes journal January 2020
Genome Sequence of the Extremely Acidophilic Fungus Acidomyces richmondensis FRIK2901 journal October 2018
New insights on unspecific peroxygenases: superfamily reclassification and evolution journal March 2019
Genome-scale data resolve ancestral rock-inhabiting lifestyle in Dothideomycetes (Ascomycota) journal October 2019
Hiding in plain sight: New virus genomes discovered via a systematic analysis of fungal public transcriptomes journal July 2019
Comparative Genomics Unravels the Functional Roles of Co-occurring Acidophilic Bacteria in Bioleaching Heaps journal May 2017