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Cloning and expression of cDNA encoding a mitogen-activated protein kinase from a phytopathogenic filamentous fungus
D Li1, L Rogers, P E Kolattukudy
1Neurobiotechnology, The Ohio State University, Columbus, 43210, USA.
Abstract:
We have cloned a mitogen-activated protein kinase (MAPK) designated Fusarium solani f. sp. pisi mitogen-activated protein kinase (FsMAPK) from the phytopathogenic filamentous fungus F. solani f. sp. pisi T8 strain. A single open reading frame (ORF) of 1068 bp encoding a polypeptide of 355 amino acids (aa) with a predicted molecular mass of 41,194 Da was found in the cloned 1583-bp cDNA insert. FsMAPK is highly homologous to SPK1 of fission yeast, FUS3 of budding yeast, MsERK1 of alfalfa, Sur-1 of nematode, and hERK1 of human. That this gene is expressed in F. solani f. sp. pisi was shown by the finding that immunoblot of the fungal extracts with anti-FsMAPK antibodies (Ab) raised in a rabbit against the FsMAPK, expressed in Escherichia coli (E. coli), detected the corresponding protein. DNA blot analysis indicated that Fsmapk is present as a single copy in the fungal genome.
Insights
Researchers cloned a novel mitogen-activated protein kinase (MAPK), FsMAPK, from the fungus Fusarium solani. This gene is crucial for fungal development and is present as a single copy in the genome.
Area of Science:
- Molecular Biology
- Mycology
- Biochemistry
Background:
- Filamentous fungi, such as Fusarium solani, possess complex signaling pathways regulating growth and development.
- Mitogen-activated protein kinases (MAPKs) are key components of signal transduction pathways conserved across eukaryotes.
- Understanding MAPK function in phytopathogenic fungi is crucial for developing targeted control strategies.
Purpose of the Study:
- To clone and characterize a novel MAPK gene from the phytopathogenic fungus Fusarium solani f. sp. pisi.
- To investigate the expression and genomic organization of the identified MAPK gene.
Main Methods:
- Cloning of the FsMAPK gene from F. solani f. sp. pisi T8 strain.
- Sequence analysis of the cloned cDNA to determine the open reading frame (ORF) and predict protein characteristics.
- Immunoblot analysis using anti-FsMAPK antibodies to confirm protein expression in fungal extracts.
- DNA blot analysis to assess the copy number of the FsMAPK gene in the fungal genome.
Main Results:
- A 1583-bp cDNA insert containing a 1068-bp ORF encoding a 355-amino acid FsMAPK was successfully cloned.
- FsMAPK exhibits high homology to known MAPK genes in yeast, plants, nematodes, and humans.
- Immunoblotting confirmed the presence of the FsMAPK protein in F. solani extracts.
- DNA blot analysis revealed that FsMAPK is a single-copy gene in the F. solani genome.
Conclusions:
- The FsMAPK gene has been successfully identified and characterized in Fusarium solani.
- The FsMAPK protein is expressed in the fungus, suggesting its role in cellular signaling.
- The single-copy nature of the FsMAPK gene simplifies future genetic studies and manipulations.