ジャーナル: Structure / 年: 2025 タイトル: Lipids modulate the open probability of RyR1 under cryo-EM conditions. 著者: Chenyao Li / Rouslan G Efremov / 要旨: Ryanodine receptors (RyRs) are intracellular tetrameric ion channels responsible for Ca release from the sarcoplasmic and endoplasmic reticulum. Ryanodine receptor 1 (RyR1) isoform, critical for ...Ryanodine receptors (RyRs) are intracellular tetrameric ion channels responsible for Ca release from the sarcoplasmic and endoplasmic reticulum. Ryanodine receptor 1 (RyR1) isoform, critical for muscle contraction, has been studied most extensively. While cryoelectron microscopy (cryo-EM) has been instrumental in revealing near-atomic details of RyR gating mechanisms, the open probability of RyR1 under cryo-EM conditions is notably lower than that observed in electrophysiological studies. Here, we present a cryo-EM study examining the open probability of RyR1 solubilized in CHAPS with varying lipid concentrations. We found that increasing lipid concentration from 0.001% to 0.05% raised the RyR1 open probability from 16% to 84%, whereas RyR1 reconstituted into lipid nanodiscs remained closed. We modeled 72 lipid molecules in the map reconstructed at the highest lipid concentration. These findings demonstrate the important role of lipids in modulating the open fraction of solubilized RyR1 channels under cryo-EM conditions and suggest optimal lipid mimetics for structural studies of RyR1 gating.
履歴
登録
2024年11月14日
登録サイト: PDBE / 処理サイト: PDBE
改定 1.0
2025年9月17日
Provider: repository / タイプ: Initial release
改定 1.0
2025年9月17日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2025年9月17日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2025年9月17日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Database references / Experimental summary / Data content type: EM metadata / EM metadata / カテゴリ: citation / em_admin Data content type: EM metadata / EM metadata ...EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata / EM metadata Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update
電子線照射量: 60 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k)
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解析
EMソフトウェア
ID
名称
バージョン
カテゴリ
詳細
1
cryoSPARC
4.3.0
粒子像選択
templatepickingwasusedforparticlepicking
4
RELION
4.1
CTF補正
10
cryoSPARC
3
初期オイラー角割当
12
RELION
4.1
分類
13
cryoSPARC
4.31
3次元再構成
画像処理
詳細: The movies were selected after MotionCor correction and CTF refinement with the parameters: total drift less than 30 angstrom and resolution better than 5 angstrom
CTF補正
タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION
粒子像の選択
選択した粒子像数: 333223 詳細: Particles were picked by template picking in Cryosparc
3次元再構成
解像度: 3.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 279776 / 対称性のタイプ: POINT