AI Article Synopsis
- The study investigates how specific mutations in the human ventricular essential myosin light chain (hVLC-1) linked to hypertrophic cardiomyopathy (HCM) affect protein structure and interactions.
- Methods used include circular dichroism and surface plasmon resonance to analyze the binding of mutated hVLC-1 with cardiac myosin heavy chain, highlighting significantly lower affinities for the mutated forms compared to the normal version.
- The findings suggest that the E56G mutation in hVLC-1 notably disrupts its binding to myosin, leading to altered cellular sorting and potentially contributing to the development of HCM.
Article Abstract
Aims: We tested the hypothesis that mutations in the human ventricular essential myosin light chain (hVLC-1) that are associated with hypertrophic cardiomyopathy (HCM) affect protein structure, binding to the IQ1 motif of cardiac myosin heavy chain (MYH) and sarcomeric sorting in neonatal cardiomyocytes.
Methods And Results: We employed circular dichroism and surface plasmon resonance spectroscopy to investigate structural properties and protein-protein interactions of a recombinant head-rod fragment of rat cardiac β-MYH (amino acids 664-915) with alanine-mutated IQ2 domain (rβ-MYH(664-915)IQ2(ala4)) and normal or five mutated (M149V, E143K, A57G, E56G, R154H) hVLC-1 forms. Double epitope-tagging competition was used to monitor the intracellular localization of exogenously introduced normal and E56G-mutated (hVLC-1(E56G)) hVLC-1 constructs in neonatal rat cardiomyocytes. Fluorescence lifetime imaging microscopy was applied to map the microenvironment of normal and E56G-mutated hVLC-1 in permeabilized muscle fibres. Affinity of M149V, E143K, A57G, and R154H mutated hVLC-1/rβ-MYH(664-915)IQ2(ala4) complexes was significantly lower compared with the normal hVLC-1/rβ-MYH(664-915)IQ2(ala4) complex interaction. In particular, the E56G mutation induced an ∼30-fold lower MYH affinity. Sorting specificity of E56G-mutated hVLC-1 was negligible compared with normal hVLC-1. Fluorescence lifetime of fibres replaced with hVLC-1(E56G) increased significantly compared with hVLC-1-replaced fibres.
Conclusion: Disturbed myosin binding of mutated hVLC-1 may provide a pathomechanism for the development of HCM.
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| http://dx.doi.org/10.1093/cvr/cvr320 | DOI Listing |
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