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Isolation and characterization of a cDNA from Trichoderma harzianum P1 encoding a 14-3-3 protein homolog
S S Klemsdal1, C K Hayes, L Hjeljord
1Norwegian Crop Research Institute, Department of Plant Pathology, As, Norway. sonja.klemsdal@planteforsk.nlh.no
Abstract:
A full-length cDNA close, Th1433, (GenBank accession No. U24158), was isolated and characterized from the filamentous fungus, Trichoderma harzianum. The deduced amino acid (aa) sequence showed an acidic 30-kDa protein homologous to the 14-3-3 proteins, a family of putative kinase regulators originally characterized in mammalian brain tissue. The greatest homology, 71% identical aa, was found to BMH1, the corresponding protein from Saccharomyces cerevisiae and to the epsilon isoform from sheep brain. Southern analysis of genomic DNA indicated that Th1433 is a member of a small genomic family. At least two genes encoding 14-3-3-like proteins exist in T. harzianum. Northern analysis showed the highest level of expression during the first day after inoculation of the culture with conidial spores.
Insights
Researchers identified a novel 14-3-3 protein, Th1433, in Trichoderma harzianum. This acidic protein is homologous to mammalian kinase regulators and its gene is part of a small family within the fungus.
Area of Science:
- Molecular Biology
- Mycology
- Biochemistry
Background:
- The 14-3-3 proteins are a conserved family of regulatory molecules involved in various cellular processes, originally identified in mammalian brain.
- Filamentous fungi, such as Trichoderma harzianum, possess complex regulatory networks that are not fully understood.
- Understanding fungal protein families can provide insights into their growth, development, and interactions.
Purpose of the Study:
- To isolate and characterize a novel gene encoding a 14-3-3-like protein from Trichoderma harzianum.
- To determine the homology and phylogenetic relationship of the identified protein to known 14-3-3 proteins.
- To investigate the gene family size and expression patterns of the Th1433 gene in T. harzianum.
Main Methods:
- Isolation and sequencing of a full-length cDNA clone (Th1433).
- Deduced amino acid sequence analysis and homology searches against protein databases.
- Southern blot analysis of Trichoderma harzianum genomic DNA.
- Northern blot analysis to assess gene expression levels.
Main Results:
- A full-length cDNA clone, Th1433, was isolated, encoding a 30-kDa acidic protein homologous to 14-3-3 proteins.
- Th1433 showed the highest amino acid identity (71%) to Saccharomyces cerevisiae BMH1 and sheep brain epsilon isoform.
- Southern analysis indicated Th1433 belongs to a small gene family, with at least two 14-3-3-like genes in T. harzianum.
- Northern analysis revealed peak Th1433 expression within the first 24 hours post-inoculation.
Conclusions:
- Th1433 represents a novel fungal member of the conserved 14-3-3 protein family.
- The gene family for 14-3-3-like proteins in T. harzianum is small.
- Th1433 expression is developmentally regulated, peaking early in fungal growth.