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基本情報
登録情報 | データベース: PDB / ID: 6vw2 | ||||||
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タイトル | Cryo-EM structure of human islet amyloid polypeptide (hIAPP, or amylin) fibrils | ||||||
![]() | Islet amyloid polypeptide (SUMO-tagged) | ||||||
![]() | PROTEIN FIBRIL / hIAPP / type II diabetes / amyloid | ||||||
機能・相同性 | ![]() SUMO is conjugated to E1 (UBA2:SAE1) / SUMOylation of nuclear envelope proteins / SUMO is transferred from E1 to E2 (UBE2I, UBC9) / SUMO is proteolytically processed / SUMOylation of transcription factors / SUMOylation of transcription cofactors / Postmitotic nuclear pore complex (NPC) reformation / septin ring / SUMOylation of DNA damage response and repair proteins / amylin receptor 3 signaling pathway ...SUMO is conjugated to E1 (UBA2:SAE1) / SUMOylation of nuclear envelope proteins / SUMO is transferred from E1 to E2 (UBE2I, UBC9) / SUMO is proteolytically processed / SUMOylation of transcription factors / SUMOylation of transcription cofactors / Postmitotic nuclear pore complex (NPC) reformation / septin ring / SUMOylation of DNA damage response and repair proteins / amylin receptor 3 signaling pathway / amylin receptor 2 signaling pathway / Transcriptional and post-translational regulation of MITF-M expression and activity / amylin receptor 1 signaling pathway / SUMOylation of DNA replication proteins / amylin receptor signaling pathway / Calcitonin-like ligand receptors / SUMOylation of SUMOylation proteins / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / SUMOylation of RNA binding proteins / negative regulation of amyloid fibril formation / SUMOylation of chromatin organization proteins / negative regulation of bone resorption / eating behavior / negative regulation of osteoclast differentiation / Regulation of gene expression in beta cells / ubiquitin-like protein ligase binding / positive regulation of cAMP/PKA signal transduction / protein sumoylation / bone resorption / negative regulation of protein-containing complex assembly / sensory perception of pain / osteoclast differentiation / positive regulation of calcium-mediated signaling / condensed nuclear chromosome / hormone activity / protein tag activity / cell-cell signaling / amyloid-beta binding / G alpha (s) signalling events / positive regulation of MAPK cascade / positive regulation of apoptotic process / receptor ligand activity / Amyloid fiber formation / signaling receptor binding / neuronal cell body / apoptotic process / lipid binding / signal transduction / extracellular space / extracellular region / identical protein binding / nucleus 類似検索 - 分子機能 | ||||||
生物種 | ![]() ![]() ![]() | ||||||
手法 | 電子顕微鏡法 / らせん対称体再構成法 / クライオ電子顕微鏡法 / 解像度: 3.4 Å | ||||||
![]() | Cao, Q. / Boyer, D.R. / Sawaya, M.R. / Eisenberg, D.S. | ||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Cryo-EM structure and inhibitor design of human IAPP (amylin) fibrils. 著者: Qin Cao / David R Boyer / Michael R Sawaya / Peng Ge / David S Eisenberg / ![]() 要旨: Human islet amyloid polypeptide (hIAPP) functions as a glucose-regulating hormone but deposits as amyloid fibrils in more than 90% of patients with type II diabetes (T2D). Here we report the cryo-EM ...Human islet amyloid polypeptide (hIAPP) functions as a glucose-regulating hormone but deposits as amyloid fibrils in more than 90% of patients with type II diabetes (T2D). Here we report the cryo-EM structure of recombinant full-length hIAPP fibrils. The fibril is composed of two symmetrically related protofilaments with ordered residues 14-37. Our hIAPP fibril structure (i) supports the previous hypothesis that residues 20-29 constitute the core of the hIAPP amyloid; (ii) suggests a molecular mechanism for the action of the hIAPP hereditary mutation S20G; (iii) explains why the six residue substitutions in rodent IAPP prevent aggregation; and (iv) suggests regions responsible for the observed hIAPP cross-seeding with β-amyloid. Furthermore, we performed structure-based inhibitor design to generate potential hIAPP aggregation inhibitors. Four of the designed peptides delay hIAPP aggregation in vitro, providing a starting point for the development of T2D therapeutics and proof of concept that the capping strategy can be used on full-length cryo-EM fibril structures. | ||||||
履歴 |
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構造の表示
ムービー |
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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 | ![]() | 67.9 KB | 表示 | ![]() |
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PDB形式 | ![]() | 41.1 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 | ![]() 21410MC 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 | |
電子顕微鏡画像生データ | ![]() Data size: 1.9 TB Data #1: Unaligned K2 movies of unseeded, recombinant hIAPP amyloid fibrils [micrographs - multiframe]) |
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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: 17274.273 Da / 分子数: 10 / 由来タイプ: 組換発現 由来: (組換発現) ![]() ![]() ![]() 株: ATCC 204508 / S288c / 遺伝子: SMT3, YDR510W, D9719.15, IAPP / 発現宿主: ![]() ![]() |
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-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: FILAMENT / 3次元再構成法: らせん対称体再構成法 |
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試料調製
構成要素 | 名称: hIAPP fibril / タイプ: ORGANELLE OR CELLULAR COMPONENT / Entity ID: all / 由来: RECOMBINANT |
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由来(天然) | 生物種: ![]() |
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): 2000 nm / 最小 デフォーカス(公称値): 2000 nm / Cs: 2.7 mm / C2レンズ絞り径: 50 µm |
撮影 | 平均露光時間: 8 sec. / 電子線照射量: 44 e/Å2 / 検出モード: SUPER-RESOLUTION フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) |
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解析
EMソフトウェア |
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||||||||||||
らせん対称 | 回転角度/サブユニット: 179.42 ° / 軸方向距離/サブユニット: 2.406 Å / らせん対称軸の対称性: C1 | ||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.4 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 25767 / 対称性のタイプ: HELICAL |