Calsequestrin interacts directly with the cardiac ryanodine receptor luminal domain

Author:

Handhle Ahmed12,Ormonde Chloe E.1,Thomas N. Lowri1,Bralesford Catherine1,Williams Alan J.1,Lai F. Anthony1,Zissimopoulos Spyros1ORCID

Affiliation:

1. Sir Geraint Evans Wales Heart Research Institute, School of Medicine, Cardiff University, UK

2. Medical Biochemistry Department, Faculty of Medicine, Mansoura University, Egypt

Abstract

Cardiac muscle contraction requires sarcoplasmic reticulum (SR) Ca2+ release mediated by the quaternary complex comprising the ryanodine receptor (RyR2), calsequestrin (CSQ2), junctin and triadin. Here, we demonstrate that a direct interaction exists between RyR2 and CSQ2. Topologically, CSQ2 binding occurs at the first luminal loop of RyR2. Co-expression of RyR2 and CSQ2 in a human cell line devoid of the other quaternary complex proteins results in altered Ca2+ release dynamics compared to cells expressing RyR2 only. These findings provide a novel perspective for understanding the SR luminal Ca2+ sensor and its involvement in cardiac physiology and disease.

Funder

British Heart Foundation

Publisher

The Company of Biologists

Subject

Cell Biology

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