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Mechanism of adrenergic CaV1.2 stimulation revealed by proximity proteomics
Open accessAbstract
Increased cardiac contractility during the fight-or-flight response is caused by β-adrenergic augmentation of Ca V 1.2 voltage-gated calcium channels 1-4. However, this augmentation persists in transgenic murine hearts expressing mutant Ca V 1.2 α 1C and β subunits that can no longer be phosphorylated by protein kinase A-an essential downstream mediator of β-adrenergic signalling-suggesting that non-channel factors are also required. Here we identify the mechanism by which β-adrenergic agonists stimulate voltage-gated calcium channels. We express α 1C or β 2B subunits conjugated to ascorbate peroxidase 5 in mouse hearts, and use multiplexed quantitative proteomics 6,7 to track hundreds of proteins in the proximity of Ca V 1.2. We observe that the calcium-channel inhibitor Rad 8,9, a monomeric G protein, is enriched in the Ca V 1.2 microenvironment but is depleted during β-adrenergic stimulation. Phosphorylation by protein kinase A of specific serine residues on Rad decreases its affinity for β subunits and relieves constitutive inhibition of Ca V 1.2, observed as an increase in channel open probability. Expression of Rad or its homologue Rem in HEK293T cells also imparts stimulation of Ca V 1.3 and Ca V 2.2 by protein kinase A, revealing an evolutionarily conserved mechanism that confers adrenergic modulation upon voltage-gated calcium channels.
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“proximity labelling to assess protein–protein interactions involved in β-adrenergic signalling of contractility in cardiac fight-or-flight responses124 and evaluation of regenerative stem cell therapy efficacy in post-infarct hearts125.”
From A high-stringency blueprint of the human proteome (2020) · cites this paper as [124]
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Metadata
- Authors
- Liu, G., Papa, A., Katchman, A. N., Zakharov, S. I., Roybal, D., Hennessey, J. A., Kushner, J., Yang, L., Chen, B.-X., Kushnir, A., Dangas, K., Gygi, S. P., Pitt, G. S., Colecraft, H. M., Ben-Johny, M., Kalocsay, M., & Marx, S. O.
- Affiliations
- Columbia University (US)
- Harvard University (US)
- Weill Cornell Medicine (US)
- Columbia University Irving Medical Center (US)
- Corresponding author
- Kalocsay, Marian
- Marx, Steven O.
- ORCID
- Venue
- Nature
- Published
- 2020-01-22
- Volume
- 577
- Issue
- 7792
- Pages
- 695-700
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- PMC
- PMC7018383
- OpenAlex
- W3003002159
- Cited by
- 243
- References
- 74
- Citations by year
- 2026: 23 · 2025: 31 · 2024: 36 · 2023: 36 · 2022: 39 · 2021: 50 · 2020: 28
- FWCI
- 12.41
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Digital Access to Scholarship at Harvard (DASH) (Harvard University) (acceptedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- Funders
- National Institutes of Health (UL1TR001873)
- National Heart, Lung, and Blood Institute (R01HL113136, F31HL142178, T32HL120826, R01HL126735, R01HL121253, R01HL140934, R01HL146149, T32HL160520, T32HL007343, T32HL007854)
- National Cancer Institute (P30CA013696)
- National Center for Advancing Translational Sciences
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
- Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac electrophysiology and arrhythmias
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
- Keywords
- Cav1.2, voltage-gated calcium channels, beta-adrenergic signaling, protein kinase A, REM, G proteins, channel phosphorylation, channel inhibition, cardiac contractility, proximity proteomics, ascorbate peroxidase, Cav1.3, CaV2.2, calcium current
- MeSH terms
- Protein Domains, Cyclic AMP, Animals, Female, Humans, Male, Myocardium, Phosphorylation, Receptors, Adrenergic, beta, Signal Transduction, Cyclic AMP-Dependent Protein Kinases, ras Proteins, Monomeric GTP-Binding Proteins, Calcium Channels, L-Type, Calcium Channels, N-Type, Heterotrimeric GTP-Binding Proteins, Protein Subunits, Proteomics, Mice, HEK293 Cells, Cellular Microenvironment
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