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Molecular cloning, characterization and expression analysis of CmAPX.

Hong Cheng¹, Qiwei He, Yumeng Huo

¹College of Horticulture Science and Engineering, Shandong Agricultural University, Tai'an, 271018, China.

Molecular Biology Reports

|August 30, 2008

Summary

Researchers identified a muskmelon APX gene (CmAPX) involved in powdery mildew resistance. This gene shows tissue-specific expression and may play a key role in the plant's defense against this common fungal disease.

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Area of Science:

Plant Molecular Biology
Plant Pathology
Biochemistry

Background:

Powdery mildew significantly impacts muskmelon crop yield.
Ascorbate peroxidase (APX) enzymes are crucial for plant stress responses.
Understanding plant defense mechanisms against pathogens is vital for agricultural sustainability.

Purpose of the Study:

To isolate and characterize a novel APX gene from muskmelon (Cucumis melo).
To investigate the expression patterns and potential role of the identified APX gene in response to powdery mildew infection.
To facilitate further research into APX-mediated plant immunity.

Main Methods:

Reverse Transcription Polymerase Chain Reaction (RT-PCR) and Rapid Amplification of cDNA Ends (RACE) were employed to obtain the muskmelon APX gene sequence.

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The full-length open reading frame (ORF) was cloned into a prokaryotic expression vector (pET24a) for recombinant protein production in E. coli.

Quantitative analysis of mRNA expression levels and enzyme activity assays were performed.

Main Results:

A 1,047 bp cDNA sequence for the muskmelon APX gene (CmAPX) was successfully obtained, encoding a 249-amino acid protein with a molecular weight of 27.3 kDa.
The CmAPX gene consists of 10 exons and 9 introns, with deduced amino acid sequences showing 74-97% identity to homologous APX family members.
High expression levels of recombinant CmAPX protein were achieved in E. coli, and mRNA analysis revealed highly tissue-specific expression patterns in muskmelon, with increased activity during powdery mildew pathogenesis.

Conclusions:

The characterized muskmelon APX gene (CmAPX) is structurally similar to other known APX genes.
CmAPX exhibits significant tissue-specific expression, suggesting a specialized role in muskmelon physiology.
Evidence indicates that CmAPX plays a crucial role in the plant's response to powdery mildew, highlighting its potential as a target for improving disease resistance.