Structural Mapping of Divergent Regions in the Type 1 Ryanodine Receptor Using Fluorescence Resonance Energy Transfer

Overview

Journal Structure

Publisher Cell Press

Specialties Biochemistry
Biotechnology
Cell Biology
Molecular Biology

Date 2014 Aug 19

PMID 25132084

Citations 5

Authors

Mohana Mahalingam

Tanya Girgenrath

Bengt Svensson

David D Thomas

Razvan L Cornea

James D Fessenden

Affiliations

Soon will be listed here.

Abstract

Ryanodine receptors (RyRs) release Ca(2+) to initiate striated muscle contraction. Three highly divergent regions (DRs) in the RyR protein sequence (DR1, DR2, and DR3) may confer isoform-specific functional properties to the RyRs. We used cell-based fluorescence resonance energy transfer (FRET) measurements to localize these DRs to the cryoelectron microscopic (cryo-EM) map of the skeletal muscle RyR isoform (RyR1). FRET donors were targeted to RyR1 using five different FKBP12.6 variants labeled with Alexa Fluor 488. FRET was then measured to the FRET acceptors, Cy3NTA or Cy5NTA, targeted to decahistidine tags introduced within the DRs. DR2 and DR3 were localized to separate positions within the "clamp" region of the RyR1 cryo-EM map, which is presumed to interface with Cav1.1. DR1 was localized to the "handle" region, near the regulatory calmodulin-binding site on the RyR. These localizations provide insights into the roles of DRs in RyR allosteric regulation during excitation contraction coupling.

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