Related Experiment Videos
NSF regulates membrane traffic along multiple pathways in Paramecium
Roland Kissmehl1, Marine Froissard, Helmut Plattner
1University of Konstanz, Department of Biology, PO Box 5560, 78457 Konstanz, Germany. roland.kissmehl@uni-konstanz.de
Journal of Cell Science
|September 24, 2002
Summary
N-ethylmaleimide (NEM)-sensitive factor (NSF) plays a role in Paramecium vesicle transport. Gene silencing of PtNSF affects phagocytosis but not all exocytosis, revealing pathway-specific functions.
Area of Science:
- Cell Biology
- Molecular Biology
- Protozoology
Background:
- N-ethylmaleimide (NEM)-sensitive factor (NSF) is crucial for vesicular transport in eukaryotes.
- Paramecium exhibits complex, independently studied membrane traffic pathways, including exocytosis, endocytosis, and phagocytosis.
Purpose of the Study:
- To investigate the role of NSF and SNARE machinery in Paramecium's diverse vesicle transport routes.
- To identify and characterize NSF genes in Paramecium.
Main Methods:
- Identification and sequencing of NSF genes (PtNSF1 and PtNSF2) in Paramecium.
- Generation of peptide-specific antibodies against PtNSF.
- Gene silencing of PtNSF and subsequent analysis of cellular activities and ultrastructure.
- Immunofluorescence microscopy to visualize fusion events.
Main Results:
- Two highly similar PtNSF genes were identified and appear to be expressed.
- PtNSF gene silencing reduced phagocytotic activity but spared stimulated exocytosis of trichocysts.
- Ultrastructural changes in silenced cells included vesicle aggregates and altered membrane traffic structures.
- PtNSF was implicated in fusion events and potentially in the biogenesis of alveolar sacs.
Conclusions:
- PtNSF is involved in distinct vesicle transport pathways in Paramecium.
- The sensitivity of different pathways to PtNSF silencing varies, likely depending on membrane attachment dynamics.