Predicted to enable calcium ion binding activity and ryanodine-sensitive calcium-release channel activity. Involved in locomotion; positive regulation of programmed cell death; and protein localization to organelle. Located in I band and sarcoplasmic reticulum. Expressed in body wall musculature; intestine; neurons; and non-striated muscle. Used to study congenital myopathy 1A and malignant hyperthermia. Human ortholog(s) of this gene implicated in several diseases, including catecholaminergic polymorphic ventricular tachycardia 1; gestational diabetes; and muscle tissue disease (multiple). Is an ortholog of human RYR1 (ryanodine receptor 1); RYR2 (ryanodine receptor 2); and RYR3 (ryanodine receptor 3).