ArticleJournal of molecular and cellular cardiology2018
Point mutations in the tri-helix bundle of the M-domain of cardiac myosin binding protein-C influence systolic duration and delay cardiac relaxation.
Article in Journal of molecular and cellular cardiology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers.
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Who cites it
18 citing papers in PubMed, 23 citations in OpenAlex.
- Myosin-binding protein C slows cardiac myofibril relaxation kinetics.The Journal of physiology · 2025Article
- The L348P point mutation in cardiac myosin binding protein-C alters transient responses to stretch, slows cardiac relaxation, and is embryonic lethal in homozygous CRISPR gene-edited mice.Journal of molecular and cellular cardiology · 2025Article
- Disparate Molecular Properties of Two Hypertrophic Cardiomyopathy-Associated cMyBP-C Mutants Reveal Distinct Pathogenic Mechanisms Beyond Haploinsufficiency.Biomedicines · 2025Article
- Autoinhibition of cMyBP-C by its middle domains.Journal of molecular and cellular cardiology · 2025Article
- The N-Terminal Mutations of cMyBP-C Affect Calcium Regulation, Kinetics, and Force of Muscle Contraction.International journal of molecular sciences · 2024Article
- The D75N and P161S Mutations in the C0-C2 Fragment of cMyBP-C Associated with Hypertrophic Cardiomyopathy Disturb the Thin Filament Activation, Nucleotide Exchange in Myosin, and Actin-Myosin Interaction.International journal of molecular sciences · 2024Article
- The contribution of N-terminal truncated cMyBPC to in vivo cardiac function.The Journal of general physiology · 2023Article
- In situ FRET-based localization of the N terminus of myosin binding protein-C in heart muscle cells.Proceedings of the National Academy of Sciences of the United States of America · 2023Article
- Cryo-Electron Microscopy Reveals Cardiac Myosin Binding Protein-C M-Domain Interactions with the Thin Filament.Journal of molecular biology · 2022Article
- Interaction of the C2 Ig-like Domain of Cardiac Myosin Binding Protein-C with F-actin.Journal of molecular biology · 2021Article
- Making waves: A proposed new role for myosin-binding protein C in regulating oscillatory contractions in vertebrate striated muscle.The Journal of general physiology · 2021Article
- A high-throughput fluorescence lifetime-based assay to detect binding of myosin-binding protein C to F-actin.The Journal of general physiology · 2021Article
- AAV9 gene transfer of cMyBPC N-terminal domains ameliorates cardiomyopathy in cMyBPC-deficient mice.JCI insight · 2020Article
- A Novel "Cut and Paste" Method for In Situ Replacement of cMyBP-C Reveals a New Role for cMyBP-C in the Regulation of Contractile Oscillations.Circulation research · 2020Article
- Site-specific phosphorylation of myosin binding protein-C coordinates thin and thick filament activation in cardiac muscle.Proceedings of the National Academy of Sciences of the United States of America · 2019Article
- Regulating myofilament power: The determinant of health.Archives of biochemistry and biophysics · 2019Review
- Lost in translation: Interpreting cardiac muscle mechanics data in clinical practice.Archives of biochemistry and biophysics · 2019Review
- Hypertrophic cardiomyopathy mutations inScience translational medicine · 2019Article
Corrections and comments
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Authors and funding
6 authors at 2 institutions in 1 country.
Funding
Abstract
Cardiac myosin binding protein-C (cMyBP-C) is an essential regulatory protein required for proper systolic contraction and diastolic relaxation. We previously showed that N'-terminal domains of cMyBP-C stimulate contraction by binding to actin and activating the thin filament in vitro. In principle, thin filament activating effects of cMyBP-C could influence contraction and relaxation rates, or augment force amplitude in vivo. cMyBP-C binding to actin could also contribute to an internal load that slows muscle shortening velocity as previously hypothesized. However, the functional significance of cMyBP-C binding to actin has not yet been established in vivo. We previously identified an actin binding site in the regulatory M-domain of cMyBP-C and described two missense mutations that either increased (L348P) or decreased (E330K) binding affinity of recombinant cMyBP-C N'-terminal domains for actin in vitro. Here we created transgenic mice with either the L348P or E330K mutations to determine the functional significance of cMyBP-C binding to actin in vivo. Results showed that enhanced binding of cMyBP-C to actin in L348P-Tg mice prolonged the time to end-systole and slowed relaxation rates. Reduced interactions between cMyBP-C and actin in E330K-Tg mice had the opposite effect and significantly shortened the duration of ejection. Neither mouse model displayed overt systolic dysfunction, but L348P-Tg mice showed diastolic dysfunction presumably resulting from delayed relaxation. We conclude that cMyBP-C binding to actin contributes to sustained thin filament activation at the end of systole and during isovolumetric relaxation. These results provide the first functional evidence that cMyBP-C interactions with actin influence cardiac function in vivo.
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Registered trials
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