Calmodulin (カルモジュリン) / Complex / CYTOSOLIC PROTEIN (細胞質基質)
機能・相同性
機能・相同性情報
Nitric oxide stimulates guanylate cyclase / negative regulation of hepatic stellate cell contraction / synaptic signaling by nitric oxide / negative regulation of iron ion transmembrane transport / ROS and RNS production in phagocytes / アズール顆粒 / negative regulation of vasoconstriction / retrograde trans-synaptic signaling by nitric oxide / positive regulation of sodium ion transmembrane transport / response to nitric oxide ...Nitric oxide stimulates guanylate cyclase / negative regulation of hepatic stellate cell contraction / synaptic signaling by nitric oxide / negative regulation of iron ion transmembrane transport / ROS and RNS production in phagocytes / アズール顆粒 / negative regulation of vasoconstriction / retrograde trans-synaptic signaling by nitric oxide / positive regulation of sodium ion transmembrane transport / response to nitric oxide / Ion homeostasis / nitric oxide metabolic process / postsynaptic specialization, intracellular component / positive regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / negative regulation of cytosolic calcium ion concentration / peptidyl-cysteine S-nitrosylation / cadmium ion binding / behavioral response to cocaine / positive regulation of the force of heart contraction / negative regulation of potassium ion transport / ヘルト萼状シナプス / negative regulation of calcium ion transport / negative regulation of serotonin uptake / regulation of neurogenesis / sodium channel regulator activity / negative regulation of insulin secretion / response to vitamin E / nitric-oxide synthase (NADPH) / regulation of postsynaptic membrane potential / postsynaptic density, intracellular component / multicellular organismal response to stress / nitric-oxide synthase activity / xenobiotic catabolic process / negative regulation of peptidyl-serine phosphorylation / NADPH binding / arginine catabolic process / striated muscle contraction / regulation of sodium ion transport / nitric oxide mediated signal transduction / 横行小管 / sarcoplasmic reticulum membrane / response to organonitrogen compound / cellular response to epinephrine stimulus / nitric oxide biosynthetic process / negative regulation of blood pressure / photoreceptor inner segment / response to nutrient levels / 筋小胞体 / 分泌 / response to activity / response to hormone / positive regulation of long-term synaptic potentiation / female pregnancy / muscle contraction / establishment of localization in cell / cell periphery / phosphoprotein binding / response to lead ion / response to nicotine / establishment of protein localization / potassium ion transport / response to organic cyclic compound / 筋鞘 / cellular response to growth factor stimulus / response to peptide hormone / Z disc / cellular response to mechanical stimulus / response to estrogen / vasodilation / calcium ion transport / calcium-dependent protein binding / FMN binding / positive regulation of peptidyl-serine phosphorylation / NADP binding / flavin adenine dinucleotide binding / ATPase binding / response to heat / scaffold protein binding / 核膜 / response to ethanol / mitochondrial outer membrane / negative regulation of neuron apoptotic process / transmembrane transporter binding / response to lipopolysaccharide / 樹状突起スパイン / postsynaptic density / 細胞骨格 / calmodulin binding / response to hypoxia / 脂質ラフト / negative regulation of cell population proliferation / glutamatergic synapse / シナプス / 樹状突起 / heme binding / negative regulation of apoptotic process / perinuclear region of cytoplasm / positive regulation of DNA-templated transcription / enzyme binding / positive regulation of transcription by RNA polymerase II 類似検索 - 分子機能
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM077430
米国
引用
ジャーナル: J Biol Chem / 年: 2024 タイトル: Mapping interactions of calmodulin and neuronal NO synthase by crosslinking and mass spectrometry. 著者: Dana Felker / Kanghyun Lee / Thomas H Pospiech / Yoshihiro Morishima / Haoming Zhang / Miranda Lau / Daniel R Southworth / Yoichi Osawa / 要旨: Neuronal nitric oxide synthase (nNOS) is a homodimeric cytochrome P450-like enzyme that catalyzes the conversion of L-arginine to nitric oxide in the presence of NADPH and molecular oxygen. The ...Neuronal nitric oxide synthase (nNOS) is a homodimeric cytochrome P450-like enzyme that catalyzes the conversion of L-arginine to nitric oxide in the presence of NADPH and molecular oxygen. The binding of calmodulin (CaM) to a linker region between the FAD/FMN-containing reductase domain, and the heme-containing oxygenase domain is needed for electron transfer reactions, reduction of the heme, and NO synthesis. Due to the dynamic nature of the reductase domain and low resolution of available full-length structures, the exact conformation of the CaM-bound active complex during heme reduction is still unresolved. Interestingly, hydrogen-deuterium exchange and mass spectrometry studies revealed interactions of the FMN domain and CaM with the oxygenase domain for iNOS, but not nNOS. This finding prompted us to utilize covalent crosslinking and mass spectrometry to clarify interactions of CaM with nNOS. Specifically, MS-cleavable bifunctional crosslinker disuccinimidyl dibutyric urea was used to identify thirteen unique crosslinks between CaM and nNOS as well as 61 crosslinks within the nNOS. The crosslinks provided evidence for CaM interaction with the oxygenase and reductase domain residues as well as interactions of the FMN domain with the oxygenase dimer. Cryo-EM studies, which gave a high-resolution model of the oxygenase domain, along with crosslink-guided docking provided a model of nNOS that brings the FMN within 15 Å of the heme in support for a more compact conformation than previously observed. These studies also point to the utility of covalent crosslinking and mass spectrometry in capturing transient dynamic conformations that may not be captured by hydrogen-deuterium exchange and mass spectrometry experiments.