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Calcium Imaging of Cortical Neurons using Fura-2 AM
Published on: January 19, 2009
Fura-2FF-based calcium indicator for protein labeling
Agostina A Ruggiu1, Michael Bannwarth, Kai Johnsson
1Laboratory of Protein Engineering, Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland.
Organic & Biomolecular Chemistry
|June 18, 2010
Summary
Researchers synthesized a novel Fura-2FF fluorescent indicator for calcium ions (Ca2+). This indicator can be attached to SNAP-tag fusion proteins, maintaining its calcium-sensing function after protein coupling.
Area of Science:
- Biochemistry
- Molecular Biology
- Fluorescence Spectroscopy
Background:
- Calcium ions (Ca2+) are crucial intracellular messengers involved in numerous cellular processes.
- Existing Ca2+ indicators may have limitations in specific applications, such as targeted protein labeling.
- SNAP-tag technology allows for specific covalent labeling of proteins.
Purpose of the Study:
- To develop a novel fluorescent Ca2+ indicator based on Fura-2FF.
- To enable covalent linkage of the indicator to SNAP-tag fusion proteins.
- To assess the Ca2+ sensing capabilities of the indicator after protein conjugation.
Main Methods:
- Synthesis of a Fura-2FF derivative designed for conjugation.
- Covalent coupling of the Fura-2FF indicator to SNAP-tag fusion proteins.
- Characterization of fluorescence properties and Ca2+ binding affinity of the conjugated indicator.
Main Results:
- Successful synthesis of the Fura-2FF-based fluorescent Ca2+ indicator.
- Demonstration of covalent linkage to SNAP-tag fusion proteins.
- Retention of Ca2+ sensing ability by the indicator after conjugation to proteins.
Conclusions:
- A novel, protein-linkable fluorescent Ca2+ indicator has been developed.
- This indicator can be used for specific labeling of SNAP-tag fusion proteins while retaining Ca2+ sensing function.
- This tool offers new possibilities for studying Ca2+ dynamics in specific cellular compartments or protein interactions.
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