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Published on: February 16, 2010
Fungal proteomics: mapping the mitochondrial proteins of a Trichoderma harzianum strain applied for biological
Jasmine Grinyer1, Matthew McKay, Ben Herbert
1Proteome Systems, 35-41 Waterloo Rd, North Ryde, Locked Bag 2073, 1670, Sydney, NSW, Australia. jasmine.grinyer@proteomesystems.com
Abstract:
Mitochondria are essential for cellular functions across organisms. A proteomic approach was taken to separate and identify mitochondrial proteins from a strain of Trichoderma harzianum with well established biocontrol properties. We optimized a method for the preparation of a sample enriched with mitochondria by ensuring efficient cell lysis and including several washing steps to minimize cytoplasmic contamination. We separated hundreds of proteins, using two-dimensional gel electrophoresis and identified 31 protein spots from T. harzianum, using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and liquid chromatrography with mass spectrometry. Over 50% of the identified proteins were known to localize in the mitochondria. Three protein spots were identified from T. harzianum and a further five protein spots from the genera Trichoderma and Hypocrea. The remaining protein spots were identified by cross-species identification from other filamentous fungi, including Neurospora crassa and Aspergillus spp, and yeasts, including Saccharomyces cerevisiae and Schizosaccharomyces pombe. In total, we identified 25 protein spots from T. harzianum, representing proteins that have not been characterized in existing Trichoderma protein databases. To our knowledge, this is the first two-dimensional mitochondrial protein map of a filamentous fungus.
Insights
Researchers mapped mitochondrial proteins in Trichoderma harzianum, a fungus with biocontrol properties. This study provides the first 2D mitochondrial proteomic map for a filamentous fungus, revealing novel proteins.
Area of Science:
- Biochemistry
- Molecular Biology
- Mycology
Background:
- Mitochondria are vital organelles for cellular energy production and metabolic processes in all eukaryotes.
- Trichoderma harzianum is a filamentous fungus recognized for its significant biocontrol capabilities.
- Understanding the mitochondrial proteome is crucial for elucidating fungal physiology and function.
Purpose of the Study:
- To identify and characterize mitochondrial proteins in Trichoderma harzianum using a proteomic approach.
- To develop and optimize a method for isolating enriched mitochondrial fractions from T. harzianum.
- To create the first two-dimensional mitochondrial protein map for a filamentous fungus.
Main Methods:
- Optimized cell lysis and washing steps for mitochondrial enrichment.
- Separated proteins using two-dimensional gel electrophoresis.
- Identified proteins via matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and liquid chromatography-mass spectrometry (LC-MS).
Main Results:
- Successfully separated and identified 31 protein spots from T. harzianum.
- Over 50% of identified proteins were confirmed mitochondrial localizations.
- Identified 25 novel protein spots in T. harzianum, expanding existing proteomic databases.
Conclusions:
- This study presents the first comprehensive 2D mitochondrial proteomic map of a filamentous fungus.
- The identified proteins offer insights into the mitochondrial functions of T. harzianum.
- This proteomic map serves as a valuable resource for future research on Trichoderma and related fungi.
