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基本情報
登録情報 | データベース: PDB / ID: 9isi | ||||||||||||||||||||||||||||||
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タイトル | Structure of human C3aR in apo state | ||||||||||||||||||||||||||||||
![]() | C3a anaphylatoxin chemotactic receptor,Soluble cytochrome b562 | ||||||||||||||||||||||||||||||
![]() | MEMBRANE PROTEIN / GPCR | ||||||||||||||||||||||||||||||
機能・相同性 | ![]() complement component C3a receptor activity / complement component C5a receptor activity / complement receptor mediated signaling pathway / positive regulation of neutrophil chemotaxis / blood circulation / azurophil granule membrane / positive regulation of macrophage chemotaxis / positive regulation of vascular endothelial growth factor production / Purinergic signaling in leishmaniasis infection / specific granule membrane ...complement component C3a receptor activity / complement component C5a receptor activity / complement receptor mediated signaling pathway / positive regulation of neutrophil chemotaxis / blood circulation / azurophil granule membrane / positive regulation of macrophage chemotaxis / positive regulation of vascular endothelial growth factor production / Purinergic signaling in leishmaniasis infection / specific granule membrane / Peptide ligand-binding receptors / Regulation of Complement cascade / calcium-mediated signaling / electron transport chain / G protein-coupled receptor activity / positive regulation of angiogenesis / chemotaxis / positive regulation of cytosolic calcium ion concentration / G alpha (i) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / periplasmic space / electron transfer activity / G protein-coupled receptor signaling pathway / inflammatory response / iron ion binding / heme binding / Neutrophil degranulation / plasma membrane 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: 3.56 Å | ||||||||||||||||||||||||||||||
![]() | Kim, J. / Ko, S. / Choi, H.-J. | ||||||||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural insights into small-molecule agonist recognition and activation of complement receptor C3aR. 著者: Jinuk Kim / Saebom Ko / Chulwon Choi / Jungnam Bae / Hyeonsung Byeon / Chaok Seok / Hee-Jung Choi / ![]() 要旨: The complement system plays crucial roles in innate immunity and inflammatory responses. The anaphylatoxin C3a mediates pro-inflammatory and chemotactic functions through the G protein-coupled ...The complement system plays crucial roles in innate immunity and inflammatory responses. The anaphylatoxin C3a mediates pro-inflammatory and chemotactic functions through the G protein-coupled receptor C3aR. While the active structure of the C3a-C3aR-G complex has been determined, the inactive conformation and activation mechanism of C3aR remain elusive. Here we report the cryo-EM structure of ligand-free, G protein-free C3aR, providing insights into its inactive conformation. In addition, we determine the structures of C3aR in complex with the synthetic small-molecule agonist JR14a in two distinct conformational states: a G protein-free intermediate, and a fully active G-bound state. The structure of the active JR14a-bound C3aR reveals that JR14a engages in highly conserved interactions with C3aR, similar to the binding of the C-terminal pentapeptide of C3a, along with JR14a-specific interactions. Structural comparison of C3aR in the apo, intermediate, and fully active states provides novel insights into the conformational landscape and activation mechanism of C3aR and defines a molecular basis explaining its high basal activity. Our results may aid in the rational design of therapeutics targeting complement-related inflammatory disorders. | ||||||||||||||||||||||||||||||
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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 | ![]() | 62.6 KB | 表示 | ![]() |
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PDB形式 | ![]() | 38.9 KB | 表示 | ![]() |
PDBx/mmJSON形式 | ![]() | ツリー表示 | ![]() | |
その他 | ![]() |
-検証レポート
アーカイブディレクトリ | ![]() ![]() | HTTPS FTP |
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-関連構造データ
関連構造データ | ![]() 60836MC ![]() 9ipvC ![]() 9ipyC 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
#1: タンパク質 | 分子量: 68608.289 Da / 分子数: 1 / 変異: M1012W/H1107I / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() ![]() 遺伝子: C3AR1, AZ3B, C3R1, HNFAG09, cybC 発現宿主: ![]() ![]() 参照: UniProt: Q16581, UniProt: P0ABE7 |
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Has protein modification | N |
-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: C3aR in apo state / タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT | ||||||||||||
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分子量 | 値: 80 kDa/nm / 実験値: YES | ||||||||||||
由来(天然) |
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由来(組換発現) | 生物種: ![]() ![]() | ||||||||||||
緩衝液 | pH: 8 | ||||||||||||
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: TFS 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): 1700 nm / 最小 デフォーカス(公称値): 900 nm |
撮影 | 電子線照射量: 62.6 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) |
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解析
CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3次元再構成 | 解像度: 3.56 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 349007 / 対称性のタイプ: POINT |