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Mutations in a protein kinase C homolog confer phorbol ester resistance on Caenorhabditis elegans
Y Tabuse1, K Nishiwaki, J Miwa
1Fundamental Research Laboratories, NEC Corporation, Kawasaki, Kanagawa, Japan.
Abstract:
The tpa-1 gene mediates the action of tumor-promoting phorbol esters in the nematode Caenorhabditis elegans. A genomic fragment that constitutes a portion of the tpa-1 gene was cloned by Tc1 transposon tagging and was used as a probe to screen a nematode complementary DNA library. One of the isolated complementary DNA clones had a nucleotide sequence that predicts a polypeptide of 526 amino acids. The predicted amino acid sequence revealed that the predicted tpa-1 protein sequence is highly similar to protein kinase C molecules from various animals, including man.
Insights
The tpa-1 gene in C. elegans is crucial for tumor promotion by phorbol esters. Its protein sequence shows high similarity to animal protein kinase C, suggesting a conserved function in signaling pathways.
Area of Science:
- Molecular biology
- Genetics
- Developmental biology
Background:
- The tpa-1 gene in Caenorhabditis elegans plays a role in mediating the effects of tumor-promoting phorbol esters.
- Understanding the molecular mechanisms of tumor promotion is vital in biological research.
Purpose of the Study:
- To clone and characterize the tpa-1 gene.
- To elucidate the function of the tpa-1 gene product in C. elegans.
Main Methods:
- Tc1 transposon tagging was employed to isolate a genomic fragment of the tpa-1 gene.
- A complementary DNA library from C. elegans was screened using the cloned genomic fragment as a probe.
Main Results:
- A complementary DNA clone was isolated, predicting a polypeptide of 526 amino acids.
- The predicted tpa-1 protein sequence exhibits significant similarity to protein kinase C (PKC) molecules across various animal species, including humans.
Conclusions:
- The tpa-1 gene encodes a protein kinase C-like molecule.
- This finding suggests a conserved role for protein kinase C signaling in pathways related to tumor promotion, even in a model organism like C. elegans.