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| Status |
Public on Sep 01, 2013 |
| Title |
Expression analysis from glass-bead cultures of Paxillus involutus (ATCC200175) after amendments of nitrogen (+/-NH4) to substrate followed by incubation for different periods of time |
| Platform organism |
Paxillus involutus ATCC 200175 |
| Sample organism |
Paxillus involutus |
| Experiment type |
Expression profiling by array
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| Summary |
Abstract: Proteins contribute to a major part of the organic nitrogen in forest soils. This nitrogen is mobilized and becomes available to trees as a result of the depolymerizing activities of symbiotic ectomycorrhizal fungi. The mechanisms by which these fungi depolymerize proteins and assimilate the released nitrogen are poorly characterized. Biochemical analysis and transcriptome profiling were performed to examine the proteolytic machinery and the uptake system of the ectomycorrhizal basidiomycete Paxillus involutus during the assimilation of organic nitrogen from various protein sources and extracts of organic matter. All substrates induced secretion of peptidase activity with an acidic pH optimum, mostly contributed by aspartic peptidases. The peptidase activity was transiently repressed by ammonium. Transcriptional analysis revealed a large number of extracellular endo- and exopeptidases. The expression levels of these peptidases were regulated in parallel with transporters and enzymes involved in the assimilation and metabolism of the released peptides and amino acids. For the first time the molecular components of the protein degradation pathways of an ectomycorrhizal fungus are described. The data suggest that the transcripts encoding these components are regulated in response to the chemical properties and the availability of the protein substrates.
Firoz Shah, Francois Rineau, Björn Canbäck, Tomas Johansson and Anders Tunlid (2013) The molecular components of the extracellular protein-degradation pathways of the ectomycorrhizal fungus Paxillus involutus (submitted)
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| Overall design |
A one-chip study (data from 12 subarrays collected from 12-plex Nimblegen microarray (IDs: 527896) using total RNA recovered from glass-bead cultures of Paxillus involutus (ATCC200175) after amendments of nitrogen (+/-NH4) to substrate followed by incubation for different periods of time (3 replicates of each).
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| Contributor(s) |
Johansson T, Shah F |
| Citation(s) |
23902518 |
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| Submission date |
Jun 11, 2013 |
| Last update date |
Dec 02, 2013 |
| Contact name |
Tomas Johansson |
| E-mail(s) |
[email protected]
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| Phone |
+46 46 222 45 49
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| Organization name |
Lund University
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| Department |
Biology
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| Lab |
Microbial Ecology Group
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| Street address |
Sölvegatan 37
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| City |
Lund |
| ZIP/Postal code |
SE-223 62 |
| Country |
Sweden |
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| Platforms (1) |
| GPL14950 |
NimbleGen_101221_P. involutus ATCC200175_TJ_EXP_HX12 [DesignID : 546871] |
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| Samples (12)
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| This SubSeries is part of SuperSeries: |
| GSE47840 |
The molecular components of the extracellular protein-degradation pathways of the ectomycorrhizal fungus Paxillus involutus |
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| Relations |
| BioProject |
PRJNA208066 |
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