Human R-type voltage-gated calcium channel Cav2.3 CH2II-deleted mutant at 3.1 Angstrom resolution
要素
(Voltage-dependent ...) x 2
キーワード
TRANSPORT PROTEIN / Cav2.3 / Channels / Calcium Ion-Selective
機能・相同性
機能・相同性情報
regulation of membrane repolarization during action potential / Presynaptic depolarization and calcium channel opening / calcium ion transmembrane transport via high voltage-gated calcium channel / membrane depolarization during bundle of His cell action potential / L-type voltage-gated calcium channel complex / regulation of ventricular cardiac muscle cell membrane repolarization / cardiac muscle cell action potential involved in contraction / calcium ion transport into cytosol / voltage-gated monoatomic cation channel activity / regulation of calcium ion transmembrane transport via high voltage-gated calcium channel ...regulation of membrane repolarization during action potential / Presynaptic depolarization and calcium channel opening / calcium ion transmembrane transport via high voltage-gated calcium channel / membrane depolarization during bundle of His cell action potential / L-type voltage-gated calcium channel complex / regulation of ventricular cardiac muscle cell membrane repolarization / cardiac muscle cell action potential involved in contraction / calcium ion transport into cytosol / voltage-gated monoatomic cation channel activity / regulation of calcium ion transmembrane transport via high voltage-gated calcium channel / voltage-gated calcium channel complex / Mechanical load activates signaling by PIEZO1 and integrins in osteocytes / neuronal dense core vesicle / regulation of heart rate by cardiac conduction / regulation of calcium ion transport / calcium ion import across plasma membrane / voltage-gated calcium channel activity / presynaptic active zone membrane / sarcoplasmic reticulum / GABA-ergic synapse / Regulation of insulin secretion / cellular response to amyloid-beta / calcium ion transport / chemical synaptic transmission / neuronal cell body / synapse / calcium ion binding / extracellular exosome / metal ion binding / plasma membrane 類似検索 - 分子機能
Voltage-dependent calcium channel, R-type, alpha-1 subunit / VWA N-terminal / Voltage-dependent calcium channel, alpha-2/delta subunit, conserved region / VWA N-terminal / Neuronal voltage-dependent calcium channel alpha 2acd / : / Voltage-dependent calcium channel, alpha-1 subunit, IQ domain / Voltage gated calcium channel IQ domain / Voltage gated calcium channel IQ domain / Voltage-dependent calcium channel, alpha-1 subunit ...Voltage-dependent calcium channel, R-type, alpha-1 subunit / VWA N-terminal / Voltage-dependent calcium channel, alpha-2/delta subunit, conserved region / VWA N-terminal / Neuronal voltage-dependent calcium channel alpha 2acd / : / Voltage-dependent calcium channel, alpha-1 subunit, IQ domain / Voltage gated calcium channel IQ domain / Voltage gated calcium channel IQ domain / Voltage-dependent calcium channel, alpha-1 subunit / Voltage-dependent L-type calcium channel, IQ-associated domain / Voltage-dependent L-type calcium channel, IQ-associated / : / von Willebrand factor type A domain / von Willebrand factor (vWF) type A domain / VWFA domain profile. / Voltage-dependent channel domain superfamily / von Willebrand factor, type A / von Willebrand factor A-like domain superfamily / EF-hand calcium-binding domain profile. / EF-hand domain / Ion transport domain / Ion transport protein 類似検索 - ドメイン・相同性
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
5R01GM130762
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
7R01GM057440-19
米国
引用
ジャーナル: Nat Commun / 年: 2022 タイトル: Structures of the R-type human Ca2.3 channel reveal conformational crosstalk of the intracellular segments. 著者: Xia Yao / Yan Wang / Zhifei Wang / Xiao Fan / Di Wu / Jian Huang / Alexander Mueller / Sarah Gao / Miaohui Hu / Carol V Robinson / Yong Yu / Shuai Gao / Nieng Yan / 要旨: The R-type voltage-gated Ca (Ca) channels Ca2.3, widely expressed in neuronal and neuroendocrine cells, represent potential drug targets for pain, seizures, epilepsy, and Parkinson's disease. Despite ...The R-type voltage-gated Ca (Ca) channels Ca2.3, widely expressed in neuronal and neuroendocrine cells, represent potential drug targets for pain, seizures, epilepsy, and Parkinson's disease. Despite their physiological importance, there have lacked selective small-molecule inhibitors targeting these channels. High-resolution structures may aid rational drug design. Here, we report the cryo-EM structure of human Ca2.3 in complex with α2δ-1 and β3 subunits at an overall resolution of 3.1 Å. The structure is nearly identical to that of Ca2.2, with VSD in the down state and the other three VSDs up. A phosphatidylinositol 4,5-bisphosphate (PIP2) molecule binds to the interface of VSD and the tightly closed pore domain. We also determined the cryo-EM structure of a Ca2.3 mutant in which a Ca2-unique cytosolic helix in repeat II (designated the CH2 helix) is deleted. This mutant, named ΔCH2, still reserves a down VSD, but PIP2 is invisible and the juxtamembrane region on the cytosolic side is barely discernible. Our structural and electrophysiological characterizations of the wild type and ΔCH2 Ca2.3 show that the CH2 helix stabilizes the inactivated conformation of the channel by tightening the cytosolic juxtamembrane segments, while CH2 helix is not necessary for locking the down state of VSD.
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2022年10月6日
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2022年12月14日
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2022年12月14日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
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2022年12月14日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
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