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Unwrapping the Ciliary Coat: High-Resolution Structure and Function of the Ciliary Glycocalyx
Lara M Hoepfner1, Adrian P Nievergelt2,3, Fabrizio Matrino4
1Institute of Plant Biology and Biotechnology, University of Münster, Schlossplatz 8, 48143, Münster, Germany.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|March 5, 2025
Summary
The ciliary glycocalyx, regulated by FMG1 proteins, acts as a protective layer influencing adhesion. This study reveals FMG1
Area of Science:
- Cell Biology
- Biochemistry
- Structural Biology
Background:
- The ciliary glycocalyx is a crucial glycoprotein layer involved in cellular processes.
- Its high-resolution molecular architecture remains largely uncharacterized.
- Understanding the ciliary coat's structure is key to deciphering its functions.
Purpose of the Study:
- To elucidate the molecular architecture of the ciliary coat in Chlamydomonas reinhardtii.
- To determine the structure and function of FMG1B and its newly identified isoform, FMG1A.
- To investigate the role of FMG1 proteins in adhesion and force transduction.
Main Methods:
- Cryo-electron tomography and proteomic approaches were used to analyze the ciliary coat.
- High-resolution cryo-electron microscopy (cryoEM) determined the structure of FMG1B.
- Microflow-based adhesion assays were performed on wild-type and mutant strains.
Main Results:
- The high-resolution cryoEM structure of FMG1B, a mucin orthologue, was solved, revealing N-glycosylation.
- A novel isoform, FMG1A, was identified in Chlamydomonas reinhardtii.
- A double mutant lacking FMG1A and FMG1B showed increased surface adhesion and surface-gliding capabilities.
Conclusions:
- FMG1 proteins form a protective layer with adhesion-regulatory, not adhesion-conferring, properties.
- Neither FMG1A nor FMG1B is essential for extracellular force transduction via intraflagellar transport.
- These findings describe a novel class of mucins with unique functions in the ciliary glycocalyx.
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