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Pull-down of Calmodulin-binding Proteins
Published on: January 23, 2012
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Mapping the sevoflurane-binding sites of calmodulin
Ulrika Brath1, Kelvin Lau2, Filip Van Petegem2
1Department of Chemistry and Molecular Biology and the Swedish NMR Centre, University of Gothenburg SE-412 96, Gothenburg, Sweden.
Pharmacology Research & Perspectives
|December 16, 2014
Summary
Sevoflurane binds to calmodulin in a calcium-dependent manner, interacting with sites overlapping known targets. This low-affinity binding suggests sevoflurane may affect weak calmodulin targets, impacting general anesthesia mechanisms.
Area of Science:
- Biochemistry
- Pharmacology
- Neuroscience
Background:
- General anesthetics like sevoflurane (SF) have broad nervous system effects but a narrow safety margin.
- Identifying cellular targets for volatile anesthetics is challenging due to difficulties in characterizing low-affinity interactions.
- Intracellular calcium concentration, regulated by calmodulin (CaM), is critical for functions modulated by volatile anesthetics.
Purpose of the Study:
- To characterize the interaction between sevoflurane (SF) and calmodulin (CaM) in the presence of calcium.
- To identify the specific binding sites of SF on CaM.
- To determine the binding affinity of SF to CaM.
Main Methods:
- Solution Nuclear Magnetic Resonance (NMR) spectroscopy, including chemical shift displacement, NOESY, and heteronuclear Overhauser enhancement spectroscopy (HOESY), was used to identify SF-binding sites.
- Isothermal titration calorimetry (ITC) was employed to measure binding affinities.
- Experiments were conducted with CaM in the presence and absence of calcium.
Main Results:
- Sevoflurane (SF) binds to both lobes of calcium-bound calmodulin ((Ca(2+))4-CaM) with low millimolar affinity.
- No interaction between SF and CaM was observed in the absence of calcium, indicating calcium-dependent binding.
- SF binding sites on CaM overlap with binding sites for other molecules, but the low affinity suggests interference with weak CaM targets.
Conclusions:
- Sevoflurane interacts with calmodulin in a calcium-dependent manner at specific binding clefts.
- The low binding affinity suggests that SF may modulate the function of weak calmodulin targets, contributing to its anesthetic effects.
- This finding provides insight into the molecular mechanisms of sevoflurane action.
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