The PCome of Caenorhabditis elegans as a prototypic model system for parasitic nematodes: identification of phosphorylcholine-substituted proteins
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Updated: Jul 3, 2026
Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
Published on: December 18, 2013
Julia Grabitzki1, Michael Ahrend, Harry Schachter
1Institute of Biochemistry, Faculty of Medicine, University of Giessen, Friedrichstrasse 24, Giessen, Germany.
Abstract:
The decoration of proteins and glycolipids with phosphorylcholine (PCho) has been shown in many organisms ranging from bacteria to multicellular parasites like nematodes. For bacteria this modifications is involved in invasion and persistence for pathogens. However, little is still known about the distribution of this modification on proteins, the precise epitope structures, and functions. In nematodes, the PCho-modification is widespread and at least on the glycosphingolipid level it represents a phylogenetic marker within the helminths. Nematode infections are still one of the most abundant diseases world-wide. Caenorhabditis elegans as the best characterized organism is an ideal model system for studying this type of protein modification and can therefore be regarded as a prototypic model system for parasitic nematodes. Interference with the PCho-decoration by targeting the glycosphingolipid biosynthesis and the choline metabolism has been shown to reduce nematode viability and fertility. Thus, the PCho-modification seems to play an additional important role for the development of nematodes. The development of drugs interfering with the PCho-substitution might, therefore, be a promising way for the development of new anthelminthic strategies. In this study we have analyzed the PCome of C. elegans to identify the PCho-modified proteins. Furthermore, we investigated the dynamics of this modification by analyzing the different developmental stages of this nematode. Our results demonstrate highly dynamic changes of this modification during development. Furthermore, we could show that this substitution can occur on proteins with large functional diversity and subcellular localization. We could further demonstrate that the PCho-modification greatly depends on proper N-glycosylation. However, there is clear indication that there might be a high structural diversity of the PCho-epitopes.
Insights
Phosphorylcholine (PCho) decoration on proteins in C. elegans changes dynamically during development. This modification, crucial for nematode survival, offers potential targets for new anti-parasitic drugs.
Area of Science:
- Biochemistry
- Parasitology
- Molecular Biology
Background:
- Phosphorylcholine (PCho) modification of proteins and glycolipids is found across diverse organisms, including bacteria and nematodes.
- In parasitic nematodes, PCho decoration is widespread and linked to survival, making it a potential target for therapeutic intervention.
- While PCho's role in bacteria is known, its distribution, structure, and function on proteins in nematodes remain largely uncharacterized.
Purpose of the Study:
- To identify phosphorylcholine-modified proteins (the "PCome") in the model nematode Caenorhabditis elegans.
- To investigate the dynamic changes and functional significance of PCho modification throughout nematode development.
- To explore the relationship between PCho modification, N-glycosylation, and potential structural diversity of PCho epitopes.
Main Methods:
- Proteomic analysis of the C. elegans "PCome" to identify PCho-modified proteins.
- Comparative analysis of PCho modification across different developmental stages of C. elegans.
- Investigating the dependency of PCho modification on N-glycosylation pathways.
Main Results:
- The study identified a diverse set of PCho-modified proteins in C. elegans, varying in function and subcellular localization.
- Highly dynamic changes in PCho modification were observed during nematode development.
- PCho modification was found to be significantly dependent on proper N-glycosylation, with indications of diverse epitope structures.
Conclusions:
- The PCho modification in C. elegans is dynamic and occurs on a wide range of proteins, playing a critical role in nematode development.
- Understanding the PCho modification pathway and its dependence on N-glycosylation provides insights into nematode biology.
- Targeting PCho substitution represents a promising strategy for developing novel anti-nematode therapies.
