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Title: Comparative Analysis of Secretome Profiles of Manganese(II)-Oxidizing Ascomycete Fungi

Journal Article · · PLoS ONE
 [1];  [2];  [2];  [2];  [3];  [4];  [5];  [4];  [4];  [6];  [7];  [8];  [9]
  1. Boston Univ., MA (United States); Harvard Univ., Cambridge, MA (United States)
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Smithsonian Inst., Washington, DC (United States)
  4. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  5. Univ. of Oklahoma, Norman, OK (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  6. Centre National de la Recherche Scientifique and Aix-Marseille Univ., Marseille Cedex (France); King Abdulaziz Univ., Jeddah (Saudi Arabia)
  7. Univ. of Minnesota, Minneapolis, MN (United States)
  8. Woods Hole Oceanographic Institution, Woods Hole, MA (United States)
  9. Georg-August-Univ. of Göttingen Inst. of Microbiology & Genetics (Germany)

Fungal secretomes contain a wide range of hydrolytic and oxidative enzymes, including cellulases, hemicellulases, pectinases, and lignin-degrading accessory enzymes, that synergistically drive litter decomposition in the environment. While secretome studies of model organisms such as Phanerochaete chrysosporium and Aspergillus species have greatly expanded our knowledge of these enzymes, few have extended secretome characterization to environmental isolates or conducted side-by-side comparisons of diverse species. Thus, the mechanisms of carbon degradation by many ubiquitous soil fungi remain poorly understood. Here we use a combination of LC-MS/MS, genomic, and bioinformatic analyses to characterize and compare the protein composition of the secretomes of four recently isolated, cosmopolitan, Mn(II)-oxidizing Ascomycetes (Alternaria alternata SRC1lrK2f, Stagonospora sp. SRC1lsM3a, Pyrenochaeta sp. DS3sAY3a, and Paraconiothyrium sporulosum AP3s5-JAC2a). We demonstrate that the organisms produce a rich yet functionally similar suite of extracellular enzymes, with species-specific differences in secretome composition arising from unique amino acid sequences rather than overall protein function. Furthermore, we identify not only a wide range of carbohydrate-active enzymes that can directly oxidize recalcitrant carbon, but also an impressive suite of redox-active accessory enzymes that suggests a role for Fenton-based hydroxyl radical formation in indirect, non-specific lignocellulose attack. Furthermore, our findings highlight the diverse oxidative capacity of these environmental isolates and enhance our understanding of the role of filamentous Ascomycetes in carbon turnover in the environment.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Science Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division
Grant/Contract Number:
AC05-76RL01830; AC02-05CH11231
OSTI ID:
1342335
Alternate ID(s):
OSTI ID: 1346607
Report Number(s):
PNNL-SA--121069; 48100; KP1704020
Journal Information:
PLoS ONE, Journal Name: PLoS ONE Journal Issue: 7 Vol. 11; ISSN 1932-6203
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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