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Updated: Jul 5, 2026
In vivo Neuronal Calcium Imaging in C. elegans
Published on: April 10, 2013
A novel calcineurin-interacting protein, CNP-3, modulates calcineurin deficient phenotypes in Caenorhabditis elegans
Yun Hee Kim1, Hyun-Ok Song, Kyung Min Ko
1Department of Life Science, Hanyang University, Seoul, 133-791, Korea.
Abstract:
Calcineurin (Cn) is a calcium/calmodulin-dependent serine/threonine protein phosphatase that has diverse functions in different cell types and organisms. We screened proteins interacting with the C. elegans CnA homolog, TAX-6, by the yeast two-hybrid system. CNP-3 (Calcineurin interacting protein-3) is a novel protein that physically interacts with the catalytic domain of TAX-6. It is strongly expressed in the nuclei of intestine, hypodermis, dorsal uterine regions and spermatheca. Expression begins around the 60-cell stage and proceeds during all larval stages and the adult. To elucidate the biological function of cnp-3 we isolated a cnp-3 deletion mutant. Since CNP-3 binds CnA, we looked at factors associated with calcineurin loss-of-function mutants, such as brood size, body size, serotonin- and levamisole-mediated egg-laying behavior. The cnp-3(jh145) single mutant had no gross defects compared to wild-type animal. However, the phenotypes of the double mutants, tax-6(p675);cnp-3(jh145) and cnb-1(jh103);cnp-3(jh145), were more severe in terms of brood size, body size and serotonin-mediated egg-laying defects than tax-6(p675) and cnb-1(jh103), respectively. These results suggest that dysfunction of cnp-3 enhances certain calcineurin loss-of-function phenotypes in C. elegans.
Insights
Calcineurin interacting protein-3 (CNP-3) in C. elegans enhances calcineurin loss-of-function phenotypes. The cnp-3 mutant alone shows no defects, but double mutants exhibit more severe issues with brood size, body size, and egg-laying.
Area of Science:
- Molecular biology
- Cellular biology
- Developmental biology
Background:
- Calcineurin (Cn) is a crucial calcium/calmodulin-dependent serine/threonine protein phosphatase.
- CnA homolog in C. elegans is TAX-6, involved in diverse cellular functions.
- Understanding Cn regulatory proteins is key to elucidating its biological roles.
Purpose of the Study:
- Identify novel proteins interacting with C. elegans TAX-6.
- Characterize the function of a newly identified interacting protein, CNP-3.
- Investigate the role of CNP-3 in calcineurin-mediated processes.
Main Methods:
- Yeast two-hybrid screening to identify interacting proteins.
- Isolation and characterization of a cnp-3 deletion mutant (cnp-3(jh145)).
- Phenotypic analysis of single and double mutants (tax-6;cnp-3 and cnb-1;cnp-3) for brood size, body size, and egg-laying behavior.
Main Results:
- CNP-3 physically interacts with the catalytic domain of TAX-6.
- CNP-3 is expressed in specific C. elegans tissues (intestine, hypodermis, uterus, spermatheca) starting early in development.
- The cnp-3 single mutant shows no significant defects, but double mutants with tax-6 or cnb-1 exhibit exacerbated phenotypes.
Conclusions:
- CNP-3 is a novel calcineurin-interacting protein in C. elegans.
- CNP-3 plays a role in modulating calcineurin signaling pathways.
- Dysfunction of cnp-3 potentiates calcineurin loss-of-function phenotypes, suggesting a role in regulating Cn activity or localization.
