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Pull-down of Calmodulin-binding Proteins
Published on: January 23, 2012
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Chemical shift assignments of calmodulin constructs with EF hand mutations
Michael Piazza1, J Guy Guillemette1, Thorsten Dieckmann2
1Department of Chemistry, University of Waterloo, 200 University Ave. W, Waterloo, Ontario, N2L 3G1, Canada.
Biomolecular NMR Assignments
|January 9, 2016
Summary
Calmodulin (CaM) undergoes structural changes upon calcium binding, influencing its interactions with target proteins like nitric oxide synthase. This study provides NMR assignments for CaM variants, aiding research into Ca(2+)-dependent and independent functions.
Area of Science:
- Biochemistry
- Molecular Biology
- Structural Biology
Background:
- Calmodulin (CaM) is a crucial calcium-binding protein regulating numerous cellular targets.
- CaM's structure involves two domains with EF hands that bind calcium, inducing conformational changes.
- CaM interacts with target proteins in both calcium-replete and calcium-deplete states.
Purpose of the Study:
- To investigate the calcium-dependent and independent binding properties of Calmodulin.
- To characterize the structural basis of CaM interactions with its target proteins.
- To provide NMR assignments for various CaM constructs and a peptide.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy was employed to determine backbone and sidechain resonance assignments.
- Mutant CaM constructs with disrupted calcium-binding EF hands were utilized.
- NMR assignments were obtained for different CaM lobes, full-length CaM, and a CaM-peptide complex.
Main Results:
- NMR backbone and sidechain resonance assignments were successfully determined for multiple CaM constructs.
- Assignments were provided for CaM in both calcium-replete and calcium-deplete states.
- Assignments were also obtained for CaM in complex with the inducible nitric oxide synthase (iNOS) CaM-binding domain peptide.
Conclusions:
- The provided NMR assignments are valuable for understanding CaM's structural dynamics and interactions.
- This data facilitates research into the mechanisms of CaM-target protein regulation.
- The findings contribute to elucidating the distinct binding modes of CaM with different nitric oxide synthase isoforms.
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