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标题：Identification of Cav2–PKCβ and Cav2–NOS1 complexes as entities for ultrafast electrochemical coupling
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作者：Cristina E. Constantin ; Catrin S. Müller ; Michael G. Leitner 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2017
卷号：114
期号：22
页码：5707-5712
DOI：10.1073/pnas.1616394114
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Voltage-activated calcium (Cav) channels couple intracellular signaling pathways to membrane potential by providing Ca²⁺ ions as second messengers at sufficiently high concentrations to modulate effector proteins located in the intimate vicinity of those channels. Here we show that protein kinase Cβ (PKCβ) and brain nitric oxide synthase (NOS1), both identified by proteomic analysis as constituents of the protein nano-environment of Cav2 channels in the brain, directly coassemble with Cav2.2 channels upon heterologous coexpression. Within Cav2.2–PKCβ and Cav2.2–NOS1 complexes voltage-triggered Ca²⁺ influx through the Cav channels reliably initiates enzymatic activity within milliseconds. Using BK_Ca channels as target sensors for nitric oxide and protein phosphorylation together with high concentrations of Ca²⁺ buffers showed that the complex-mediated Ca²⁺ signaling occurs in local signaling domains at the plasma membrane. Our results establish Cav2–enzyme complexes as molecular entities for fast electrochemical coupling that reliably convert brief membrane depolarization into precisely timed intracellular signaling events in the mammalian brain.
关键词：calcium channel ; protein complex ; Ca²⁺-dependent enzyme ; NOS1 ; PKC