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NDP kinase moves into developing primary cilia
Kimberly A P Mitchell1, Betty C Gallagher, Gabor Szabo
1Department of Molecular Physiology and Biological Physics, University of Virginia Medical School, Charlottesville, VA 22908-0736, USA.
Cell Motility and the Cytoskeleton
|July 20, 2004
Summary
Nucleoside diphosphate (NDP) kinases A and B are found in primary cilia of cells, suggesting a universal role. These enzymes are active within cilia and may regulate their growth and function.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Primary cilia are sensory organelles involved in various cellular functions.
- Nucleoside diphosphate (NDP) kinases are enzymes crucial for cellular energy metabolism.
Purpose of the Study:
- To investigate the localization and function of NDP kinases within primary cilia.
- To determine if NDP kinases play a role in primary cilia structure and signaling.
Main Methods:
- Immunofluorescence staining of NIH3T3 fibroblasts and Xenopus A6 kidney epithelial cells.
- Isolation of primary cilia-enriched fractions for biochemical analysis.
- Enzyme activity assays and subciliary localization studies.
Main Results:
- NDP kinases A and B localize to primary cilia in both murine and Xenopus cells.
- Translocation into cilia is size-dependent, occurring at a critical length of 5-6 microm.
- Ciliary NDP kinase is enzymatically active and associated with the ciliary membrane and matrix, not the axoneme.
Conclusions:
- NDP kinases are universal components of primary cilia, with a distinct subciliary distribution.
- The translocation and activity suggest NDP kinases regulate primary cilia elongation and maintenance.
- NDP kinases may regenerate GTP for microtubule turnover and transmembrane signaling in cilia.