What does this research mean for the field?

The conserved GXRXGGGXGD sequence motif in the ryanodine receptor constitutes an essential part of both the ryanodine binding site and the channel conduction pathway. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To determine the functional role of the conserved GXRXGGGXGD motif located in the channel-forming domain of the ryanodine receptor.

September 1, 1999Journal of Biological ChemistryOpen Access

Molecular Identification of the Ryanodine Receptor Pore-forming Segment

View Full Paper

Ask AI

Bookmark

Population

Mouse cardiac ryanodine receptor

Comparison

Site-directed mutagenesis in the GXRXGGGXGD… vs Wild type ryanodine receptor channel

Design

Preclinical

Authors

MZMingcai ZhaoSuizhou Central Hospital PLPin LiYangzhou University XLXiao‐Li LiYunnan University

Discussion

Member takes

Implication

No immediate clinical implications; extends identification of key residues in cardiac RyR2 conduction pathway.

Key Points

To determine the functional role of the conserved GXRXGGGXGD motif located in the channel-forming domain of the ryanodine receptor.
Generated point mutations within the conserved motif of the mouse cardiac ryanodine receptor using site-directed mutagenesis.
Evaluated channel function and pharmacology via [3H]ryanodine binding, calcium release measurements, and single-channel recordings in planar lipid bilayers.
Single point mutations in the conserved motif reduced or eliminated high-affinity [3H]ryanodine binding.
The G4824A point mutation reduced single-channel conductance by 97%, dropping from 798 pS in the wild-type channel to 22 pS.
Co-expression of wild-type and G4824A mutant proteins yielded functional channels exhibiting intermediate unitary conductances of 516, 256, 176, and 60 pS.

Structured PICO

Population

Mouse cardiac ryanodine receptor

Intervention

Site-directed mutagenesis (single point mutations, specifically G4824A) in the GXRXGGGXGD sequence motif

Comparator

Wild type ryanodine receptor channel

Outcome

High affinity [(3)H]ryanodine binding and single channel conductancesurrogate

The conserved GXRXGGGXGD sequence motif is an essential part of the ryanodine binding site and the channel conduction pathway of the cardiac ryanodine receptor.

Cite This Study

Zhao et al. (1999) studied this question.

synapsesocial.com/papers/6a1bcbbab33628da419ce007 https://doi.org/10.1074/jbc.274.37.25971

View Full Paper

Ask AI

Bookmark

Molecular Identification of the Ryanodine Receptor Pore-forming Segment

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Molecular Identification of the Ryanodine Receptor Pore-forming Segment

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider