Molecular characterization of a troponin I-like protein from the hard tick Haemaphysalis longicornis
1Department of Basic Veterinary Science, The United Graduate School of Veterinary Sciences, Gifu University, Yanagito, 501-1193, Gifu, Japan.
Abstract:
A cDNA expression library prepared from mRNA of Haemaphysalis longicornis (H. longicornis) was screened with a H. longicornis-infested rabbit serum. A cDNA encoding 27/30kDa proteins was cloned and designated P27/30 gene. The predicted amino acid sequence of the P27/30 gene shows a rather high homology (58% amino acid identities and 11% amino acid similarity) with Drosophila melanogaster troponin I clone E2. H. longicornis P27/30 possesses amino acid sequence of actin-binding domains of troponin I at the amino acid residues 128-148, suggesting that H. longicornis P27/30 is a troponin I-like protein. By immunoblot analysis, mouse anti-recombinant P27/30 serum reacted with major constituent protein bands in extracts of adult ticks, and also immunoreacted with muscle, cuticle, gut, and salivary gland in H. longicornis ticks. Moreover, immunohistochemistry using the anti-P27/30 serum showed a strong reactivity in muscle, suggesting that native P27/30 is expressed abundantly in that tissue.
Insights
Researchers identified a novel troponin I-like protein, P27/30, in the Haemaphysalis longicornis tick. This protein is abundant in tick muscle tissue, suggesting a role in muscle function.
Area of Science:
- Molecular Biology
- Tick Research
- Protein Biochemistry
Background:
- Haemaphysalis longicornis is a significant tick vector.
- Understanding tick proteins is crucial for developing control strategies.
- Troponin I is a key component of muscle contraction.
Purpose of the Study:
- To identify and characterize novel proteins in Haemaphysalis longicornis.
- To investigate the function and distribution of a newly identified 27/30kDa protein.
Main Methods:
- cDNA expression library screening using rabbit serum.
- Gene cloning and sequencing of the P27/30 gene.
- Immunoblot analysis and immunohistochemistry to detect protein expression.
Main Results:
- A cDNA encoding 27/30kDa proteins (P27/30 gene) was isolated from H. longicornis.
- The P27/30 protein shares homology with Drosophila melanogaster troponin I and contains actin-binding domains.
- The P27/30 protein is widely distributed in adult ticks, with high expression in muscle tissue.
Conclusions:
- The P27/30 gene encodes a troponin I-like protein in H. longicornis.
- Native P27/30 is abundantly expressed in tick muscle, indicating a potential role in muscle function.
- This finding contributes to the understanding of tick molecular biology and potential targets for intervention.
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