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The Interaction Between Echinococcus multilocularis Calreticulin S-Domain and Human Complement C1q Inhibits
Meng Xia1, Yinghui Song1, Xiaofang Dong1
1Department of Pathogenic Biology, School of Basic Medical Sciences and Forensic Medicine, Baotou Medical College, Baotou 014040, China.
Pathogens (Basel, Switzerland)
|May 4, 2026
Summary
The S-domain of Echinococcus multilocularis calreticulin (EmCRT-S) binds C1q, inhibiting complement activation and immune evasion. This domain is a promising target for vaccines against parasitic infections and inflammatory diseases.
Area of Science:
- Immunology
- Parasitology
- Molecular Biology
Background:
- EmCRT is a secreted calreticulin from Echinococcus multilocularis, crucial for immune evasion.
- Previous work showed recombinant EmCRT (rEmCRT) interferes with complement pathways by binding C1q and lectins.
- The specific C1q-binding site and immune evasion mechanism of EmCRT were previously unknown.
Purpose of the Study:
- To identify the C1q-binding site on EmCRT.
- To investigate the functional role of the identified EmCRT domain in immune evasion.
- To evaluate the potential of this domain as a therapeutic target.
Main Methods:
- Molecular docking analysis to predict the C1q-binding site.
- Fragment expression and purification of the identified EmCRT S-domain (EmCRT-S).
- Functional assays including C1q binding, complement activation inhibition, and macrophage response assessment.
Main Results:
- The C1q-binding site was localized to the S-domain (EmCRT-S) of EmCRT.
- Recombinant EmCRT-S (rEmCRT-S) effectively bound C1q and inhibited complement activation, similar to full-length rEmCRT.
- rEmCRT-S suppressed macrophage chemotaxis and reactive oxygen species (ROS) generation.
Conclusions:
- The EmCRT S-domain possesses significant complement regulatory functions.
- EmCRT-S is a key functional domain for EmCRT-mediated immune evasion.
- EmCRT-S represents a viable and practical target for developing vaccines against Echinococcus multilocularis infection and for treating inflammatory/autoimmune diseases.
