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Hrs-2 is an ATPase implicated in calcium-regulated secretion
A J Bean1, R Seifert, Y A Chen
1Howard Hughes Medical Institute, Department of Molecular and Cellular Physiology, Beckman Center for Molecular and Genetic Medicine, Stanford University School of Medicine, California 94305, USA.
Nature
|February 27, 1997
Summary
A newly identified protein, Hrs-2, regulates neurotransmission by interacting with SNAP-25. Calcium and ATP modulate this interaction, suggesting Hrs-2
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Synaptic vesicle docking and fusion are crucial for neurotransmission.
- Proteins on vesicles and presynaptic membranes mediate these processes.
- SNAP-25 is a key plasma membrane protein involved in vesicular transport.
Purpose of the Study:
- To characterize Hrs-2, a novel protein interacting with SNAP-25.
- To investigate the role of Hrs-2 in regulating secretory processes.
Main Methods:
- Protein interaction studies.
- Enzyme kinetics assays.
- Neurotransmitter release assays using permeabilized PC12 cells.
Main Results:
- Hrs-2 binds to SNAP-25, and this binding is inhibited by calcium.
- Hrs-2 hydrolyzes nucleoside triphosphates, with ATP as a likely substrate.
- Recombinant Hrs-2 inhibits calcium-triggered noradrenaline release.
Conclusions:
- Hrs-2 plays a role in regulating secretory processes.
- Its function is modulated by calcium and nucleotide binding.
- Hrs-2 represents a novel regulatory point in vesicle trafficking.