Effect of CASQ1 Protein Sequence Variants on Ca2+ Binding Ability
Abstract
Malignant hyperthermia (MH) is generally observed in people susceptible to volatile anesthetics, usually due to abnormalities in ryanodine receptor 1 (RYR1) leading to Ca2+ dysregulation in the sarcoplasmic reticulum (SR). CASQ1, a Ca2+Â binding protein believed to be in the SR, also plays a regulatory role in RYR1. It has been hypothesized that mutations in CASQ1 protein may increase susceptibility to MH cases. We used the CASQ1 p.F186Y and p.I138T variants to compare Ca2+Â binding ability with CASQ1 WT. It showed that CASQ1 F and I variants have reduced Ca2+Â binding ability compared to CASQ1 WT.
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