Key result
CPVT1-associated S616L mutation weakens the hRyR2 solenoid interface while slightly increasing thermal stability.
Why the study?
The CPVT1-associated hRyR2 mutation S616L lies near a three-way junction between the N-terminal, junctional solenoid, and bridging solenoid domains, motivating characterization of its structural, biophysical, and biochemical effects on the human cardiac ryanodine receptor.
Does the CPVT1-associated S616L mutation alter the domain interface conformation and thermal stability of the human cardiac ryanodine receptor (hRyR2) N-terminal domain?
Does the CPVT1-associated S616L mutation alter the domain interface conformation and thermal stability of the human cardiac ryanodine receptor (hRyR2) N-terminal domain?
Answers are grounded in this paper and cite their sources.
The CPVT1-associated S616L mutation slightly weakens the interface between the hRyR2 N-terminal domain and bridging solenoid to promote domain opening, while slightly increasing the thermal stability of the N-terminal domain fragment.
Catecholaminergic polymorphic ventricular tachycardia type 1 (CPVT1) is a heritable genetic disease caused by mutations to hRyR2, the cardiac isoform of the human ryanodine receptor. One such mutation, S616L, is found in the α-helical part (NSol) of the hRyR2 N-terminal domain (NTD) close to a three-way junction between the NTD, junctional solenoid (JSol), and bridging solenoid (BSol) domains. In this study, we use molecular dynamics simulation to study the effect of S616L on the residues of this junction. We find that the mutation slightly weakens the interface between the N-terminal domain and the bridging solenoid by changing the preferred conformation of the residues at the interface, thereby promoting a slight opening between these domains. In addition, we determined the impact of this mutation on the biophysical and biochemical properties of a 655-residue fragment containing the entire hRyR2 N-terminal domain, finding that it slightly increases the thermal stability of the fragment.
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Bauer et al. (2026) studied Catecholaminergic polymorphic ventricular tachycardia type 1 (CPVT1). S616L mutation in human cardiac ryanodine receptor (hRyR2) vs. Wild-type hRyR2 was evaluated on Interdomain interface stability and thermal stability of the hRyR2 N-terminal domain. The CPVT1-associated S616L mutation slightly weakened the hRyR2 NTD-bridging solenoid interface in simulations and slightly increased thermal stability of a 655-residue NTD fragment.
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