ArticleMolecular biology of the cell2014
An aspartyl cathepsin, CTH3, is essential for proprotein processing during secretory granule maturation in Tetrahymena thermophila.
Article in Molecular biology of the cell, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed, 21 citations in OpenAlex.
- Maturation stage-specific V-ATPase disassembly explains the neutral pH of mature mucocyst lysosome-related organelles in Tetrahymena thermophila.Journal of cell science · 2025Article
- Inferring gene-pathway associations from consolidated transcriptome datasets: an interactive gene network explorer forNAR genomics and bioinformatics · 2025Article
- An apical membrane complex for triggering rhoptry exocytosis and invasion in Toxoplasma.The EMBO journal · 2022Article
- A novel membrane complex is required for docking and regulated exocytosis of lysosome-related organelles in Tetrahymena thermophila.PLoS genetics · 2022Article
- Remodeling the Specificity of an Endosomal CORVET Tether Underlies Formation of Regulated Secretory Vesicles in the Ciliate Tetrahymena thermophila.Current biology : CB · 2018Article
- An endosomal syntaxin and the AP-3 complex are required for formation and maturation of candidate lysosome-related secretory organelles (mucocysts) inMolecular biology of the cell · 2017Article
- The Co-regulation Data Harvester: automating gene annotation starting from a transcriptome database.SoftwareX · 2017Article
- An evolutionary balance: conservation vs innovation in ciliate membrane trafficking.Traffic (Copenhagen, Denmark) · 2017Review
- Whole Genome Sequencing Identifies a Novel Factor Required for Secretory Granule Maturation in Tetrahymena thermophila.G3 (Bethesda, Md.) · 2016Article
- Secretion of Polypeptide Crystals from Tetrahymena thermophila Secretory Organelles (Mucocysts) Depends on Processing by a Cysteine Cathepsin, Cth4p.Eukaryotic cell · 2015Article
- Resolving the homology-function relationship through comparative genomics of membrane-trafficking machinery and parasite cell biology.Molecular and biochemical parasitologyReview
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
Abstract
In Tetrahymena thermophila, peptides secreted via dense-core granules, called mucocysts, are generated by proprotein processing. We used expression profiling to identify candidate processing enzymes, which localized as cyan fluorescent protein fusions to mucocysts. Of note, the aspartyl cathepsin Cth3p plays a key role in mucocyst-based secretion, since knockdown of this gene blocked proteolytic maturation of the entire set of mucocyst proproteins and dramatically reduced mucocyst accumulation. The activity of Cth3p was eliminated by mutation of two predicted active-site mutations, and overexpression of the wild-type gene, but not the catalytic-site mutant, partially rescued a Mendelian mutant defective in mucocyst proprotein processing. Our results provide the first direct evidence for the role of proprotein processing in this system. Of interest, both localization and the CTH3 disruption phenotype suggest that the enzyme provides non-mucocyst-related functions. Phylogenetic analysis of the T. thermophila cathepsins, combined with prior work on the role of sortilin receptors in mucocyst biogenesis, suggests that repurposing of lysosomal enzymes was an important step in the evolution of secretory granules in ciliates.
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Registered trials
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