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基本情報
登録情報 | データベース: PDB / ID: 8x8n | |||||||||||||||||||||||||||||||||||||||||||||
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タイトル | Cryo-EM structure of the octreotide-bound Somatostatin receptor 5-Gi protein complex | |||||||||||||||||||||||||||||||||||||||||||||
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![]() | SIGNALING PROTEIN / Cryo-EM / GPCR / Somatostatin receptor 5 / octreotide / Gi / complex | |||||||||||||||||||||||||||||||||||||||||||||
機能・相同性 | ![]() somatostatin receptor activity / neuropeptide binding / cellular response to glucocorticoid stimulus / positive regulation of cytokinesis / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / neuropeptide signaling pathway / regulation of insulin secretion / Peptide ligand-binding receptors / Olfactory Signaling Pathway / Activation of the phototransduction cascade ...somatostatin receptor activity / neuropeptide binding / cellular response to glucocorticoid stimulus / positive regulation of cytokinesis / G protein-coupled receptor signaling pathway, coupled to cyclic nucleotide second messenger / neuropeptide signaling pathway / regulation of insulin secretion / Peptide ligand-binding receptors / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / G-protein activation / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / Sensory perception of sweet, bitter, and umami (glutamate) taste / photoreceptor disc membrane / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADP signalling through P2Y purinoceptor 1 / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / G beta:gamma signalling through PI3Kgamma / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / adenylate cyclase-activating dopamine receptor signaling pathway / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / glucose homeostasis / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / retina development in camera-type eye / GTPase binding / Ca2+ pathway / fibroblast proliferation / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / Ras protein signal transduction / Extra-nuclear estrogen signaling / neuron projection / cell population proliferation / G protein-coupled receptor signaling pathway / negative regulation of cell population proliferation / lysosomal membrane / GTPase activity / synapse / protein-containing complex binding / signal transduction / extracellular exosome / membrane / plasma membrane / cytosol / cytoplasm 類似検索 - 分子機能 | |||||||||||||||||||||||||||||||||||||||||||||
生物種 | ![]() ![]() ![]() | |||||||||||||||||||||||||||||||||||||||||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 2.9 Å | |||||||||||||||||||||||||||||||||||||||||||||
![]() | Xu, H.E. / You, C. / Zhao, L. / Li, J. | |||||||||||||||||||||||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural basis for activation of somatostatin receptor 5 by cyclic neuropeptide agonists. 著者: Jingru Li / Chongzhao You / Yang Li / Changyao Li / Wenjia Fan / Zecai Chen / Wen Hu / Kai Wu / H Eric Xu / Li-Hua Zhao / ![]() 要旨: Somatostatin receptor 5 (SSTR5) is an important G protein-coupled receptor and drug target for neuroendocrine tumors and pituitary disorders. This study presents two high-resolution cryogenicelectron ...Somatostatin receptor 5 (SSTR5) is an important G protein-coupled receptor and drug target for neuroendocrine tumors and pituitary disorders. This study presents two high-resolution cryogenicelectron microscope structures of the SSTR5-G complexes bound to the cyclic neuropeptide agonists, cortistatin-17 (CST17) and octreotide, with resolutions of 2.7 Å and 2.9 Å, respectively. The structures reveal that binding of these peptides causes rearrangement of a "hydrophobic lock", consisting of residues from transmembrane helices TM3 and TM6. This rearrangement triggers outward movement of TM6, enabling Gα protein engagement and receptor activation. In addition to hydrophobic interactions, CST17 forms conserved polar contacts similar to somatostatin-14 binding to SSTR2, while further structural and functional analysis shows that extracellular loops differently recognize CST17 and octreotide. These insights elucidate agonist selectivity and activation mechanisms of SSTR5, providing valuable guidance for structure-based drug development targeting this therapeutically relevant receptor. | |||||||||||||||||||||||||||||||||||||||||||||
履歴 |
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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ダウンロードとリンク
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ダウンロード
PDBx/mmCIF形式 | ![]() | 425.4 KB | 表示 | ![]() |
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PDB形式 | ![]() | 346.1 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
文書・要旨 | ![]() | 1.1 MB | 表示 | ![]() |
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文書・詳細版 | ![]() | 1.1 MB | 表示 | |
XML形式データ | ![]() | 27.7 KB | 表示 | |
CIF形式データ | ![]() | 37.9 KB | 表示 | |
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
-関連構造データ
関連構造データ | ![]() 38150MC ![]() 8x8lC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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類似構造データ | 類似検索 - 機能・相同性 ![]() |
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リンク
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集合体
登録構造単位 | ![]()
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要素
-Guanine nucleotide-binding protein ... , 3種, 3分子 ABG
#1: タンパク質 | 分子量: 41510.012 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
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#2: タンパク質 | 分子量: 40226.992 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
#4: タンパク質 | 分子量: 7729.947 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
-抗体 / タンパク質 / タンパク質・ペプチド , 3種, 3分子 ERC
#3: 抗体 | 分子量: 26466.486 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() ![]() |
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#5: タンパク質 | 分子量: 39249.203 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
#6: タンパク質・ペプチド | 分子量: 1036.246 Da / 分子数: 1 / 由来タイプ: 合成 / 由来: (合成) ![]() |
-詳細
研究の焦点であるリガンドがあるか | Y |
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Has protein modification | Y |
-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
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試料調製
構成要素 | 名称: Octreotide-bound Somatostatin receptor 5-Gi protein complex タイプ: COMPLEX / Entity ID: all / 由来: MULTIPLE SOURCES | ||||||||||||
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由来(天然) |
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由来(組換発現) | 生物種: ![]() | ||||||||||||
緩衝液 | pH: 7.4 | ||||||||||||
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | ||||||||||||
急速凍結 | 凍結剤: ETHANE |
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電子顕微鏡撮影
実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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顕微鏡 | モデル: FEI TITAN KRIOS |
電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 最大 デフォーカス(公称値): 30000 nm / 最小 デフォーカス(公称値): 5000 nm |
撮影 | 電子線照射量: 1.39 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) |
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解析
EMソフトウェア | 名称: PHENIX / カテゴリ: モデル精密化 | ||||||||||||||||||||||||
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 2.9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 235599 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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