- PDB-6xqo: Structure of the human MICU1-MICU2 heterodimer, calcium bound, in... -
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基本情報
登録情報
データベース: PDB / ID: 6xqo
タイトル
Structure of the human MICU1-MICU2 heterodimer, calcium bound, in association with a lipid nanodisc
要素
Calcium uptake protein 1, mitochondrial
Calcium uptake protein 2, mitochondrial
キーワード
CALCIUM BINDING PROTEIN / ion channel / calcium channel / mitochondrial calcium uniporter / MCU / EMRE / mitochondria
機能・相同性
機能・相同性情報
mitochondrial crista junction / negative regulation of mitochondrial calcium ion concentration / regulation of cellular hyperosmotic salinity response / positive regulation of cristae formation / mitochondrial calcium ion transmembrane transport / Processing of SMDT1 / uniplex complex / positive regulation of mitochondrial calcium ion concentration / Mitochondrial calcium ion transport / mitochondrial calcium ion homeostasis ...mitochondrial crista junction / negative regulation of mitochondrial calcium ion concentration / regulation of cellular hyperosmotic salinity response / positive regulation of cristae formation / mitochondrial calcium ion transmembrane transport / Processing of SMDT1 / uniplex complex / positive regulation of mitochondrial calcium ion concentration / Mitochondrial calcium ion transport / mitochondrial calcium ion homeostasis / calcium import into the mitochondrion / calcium ion sensor activity / cellular response to calcium ion starvation / calcium ion import / calcium channel inhibitor activity / calcium channel complex / Mitochondrial protein degradation / cellular response to calcium ion / calcium channel regulator activity / defense response / mitochondrial membrane / protein homooligomerization / mitochondrial intermembrane space / mitochondrial inner membrane / protein heterodimerization activity / calcium ion binding / mitochondrion / identical protein binding 類似検索 - 分子機能
Calcium uptake protein 1/2/3 / EF hand / EF-hand domain pair / EF-hand, calcium binding motif / EF-Hand 1, calcium-binding site / EF-hand calcium-binding domain. / EF-hand calcium-binding domain profile. / EF-hand domain / EF-hand domain pair 類似検索 - ドメイン・相同性
Calcium uptake protein 2, mitochondrial / Calcium uptake protein 1, mitochondrial 類似検索 - 構成要素
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM131921
米国
National Institutes of Health/National Cancer Institute (NIH/NCI)
P30CA008748
米国
引用
ジャーナル: Elife / 年: 2020 タイトル: Structures reveal gatekeeping of the mitochondrial Ca uniporter by MICU1-MICU2. 著者: Chongyuan Wang / Agata Jacewicz / Bryce D Delgado / Rozbeh Baradaran / Stephen Barstow Long / 要旨: The mitochondrial calcium uniporter is a Ca-gated ion channel complex that controls mitochondrial Ca entry and regulates cell metabolism. MCU and EMRE form the channel while Ca-dependent regulation ...The mitochondrial calcium uniporter is a Ca-gated ion channel complex that controls mitochondrial Ca entry and regulates cell metabolism. MCU and EMRE form the channel while Ca-dependent regulation is conferred by MICU1 and MICU2 through an enigmatic process. We present a cryo-EM structure of an MCU-EMRE-MICU1-MICU2 holocomplex comprising MCU and EMRE subunits from the beetle Tribolium castaneum in complex with a human MICU1-MICU2 heterodimer at 3.3 Å resolution. With analogy to how neuronal channels are blocked by protein toxins, a uniporter interaction domain on MICU1 binds to a channel receptor site comprising MCU and EMRE subunits to inhibit ion flow under resting Ca conditions. A Ca-bound structure of MICU1-MICU2 at 3.1 Å resolution indicates how Ca-dependent changes enable dynamic response to cytosolic Ca signals.