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基本情報
登録情報 | データベース: PDB / ID: 9eag | ||||||
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タイトル | The Structure of ApoB100 from Human Low-Density Lipoprotein | ||||||
![]() | Apolipoprotein B 100 | ||||||
![]() | LIPID BINDING PROTEIN / apolipoprotein | ||||||
機能・相同性 | ![]() mature chylomicron / Scavenging by Class H Receptors / triglyceride mobilization / positive regulation of cholesterol storage / VLDL assembly / regulation of cholesterol biosynthetic process / lipase binding / LDL remodeling / Scavenging by Class B Receptors / VLDL clearance ...mature chylomicron / Scavenging by Class H Receptors / triglyceride mobilization / positive regulation of cholesterol storage / VLDL assembly / regulation of cholesterol biosynthetic process / lipase binding / LDL remodeling / Scavenging by Class B Receptors / VLDL clearance / triglyceride catabolic process / very-low-density lipoprotein particle assembly / low-density lipoprotein particle clearance / chylomicron remnant / intermediate-density lipoprotein particle / Chylomicron clearance / Chylomicron remodeling / cellular response to lipoprotein particle stimulus / Chylomicron assembly / LDL clearance / Regulation of TLR by endogenous ligand / flagellated sperm motility / positive regulation of lipid storage / chylomicron / lipoprotein catabolic process / low-density lipoprotein particle / lipoprotein biosynthetic process / cholesterol transfer activity / cholesterol transport / very-low-density lipoprotein particle / low-density lipoprotein particle remodeling / positive regulation of macrophage derived foam cell differentiation / fertilization / cholesterol efflux / artery morphogenesis / lipoprotein transport / Scavenging by Class A Receptors / low-density lipoprotein particle receptor binding / Scavenging by Class F Receptors / Platelet sensitization by LDL / endoplasmic reticulum exit site / smooth endoplasmic reticulum / Retinoid metabolism and transport / lipid droplet / endocytic vesicle lumen / cholesterol metabolic process / lysosomal lumen / cholesterol homeostasis / post-embryonic development / endosome lumen / Cell surface interactions at the vascular wall / establishment of localization in cell / Post-translational protein phosphorylation / clathrin-coated endocytic vesicle membrane / Heme signaling / response to virus / phospholipid binding / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / nervous system development / Cargo recognition for clathrin-mediated endocytosis / heparin binding / Clathrin-mediated endocytosis / spermatogenesis / in utero embryonic development / early endosome / endosome membrane / receptor ligand activity / endoplasmic reticulum lumen / neuronal cell body / intracellular membrane-bounded organelle / positive regulation of gene expression / endoplasmic reticulum membrane / extracellular space / extracellular exosome / extracellular region / 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: 9 Å | ||||||
![]() | Berndsen, Z.T. / Cassidy, C.K. | ||||||
資金援助 | 1件
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![]() | ![]() タイトル: The structure of apolipoprotein B100 from human low-density lipoprotein. 著者: Zachary T Berndsen / C Keith Cassidy / ![]() 要旨: Low-density lipoprotein (LDL) has a central role in lipid and cholesterol metabolism and is a key agent in the development and progression of atherosclerosis, the leading cause of mortality worldwide. ...Low-density lipoprotein (LDL) has a central role in lipid and cholesterol metabolism and is a key agent in the development and progression of atherosclerosis, the leading cause of mortality worldwide. Apolipoprotein B100 (apoB100), one of the largest proteins in the genome, is the primary structural and functional component of LDL, yet its size and complex lipid associations have posed major challenges for structural studies. Here we present the structure of apoB100 resolved to subnanometre resolution in most regions using an integrative approach of cryo-electron microscopy, AlphaFold2 and molecular-dynamics-based refinement. The structure consists of a large globular N-terminal domain and an approximately 61-nm-long continuous amphipathic β-sheet that wraps around the LDL particle like a belt. Distributed quasi-symmetrically across the two sides of the β-belt are nine strategically located interstrand inserts that extend across the lipid surface to provide additional structural support through a network of long-range interactions. We further compare our structure to a comprehensive list of more than 200 intramolecular cross-links and find close agreement between the two. These results suggest a mechanism for how the various domains of apoB100 act in concert to maintain LDL shape and cohesion across a range of particle sizes. More generally, they advance our fundamental understanding of LDL synthesis, form and function, and will help to accelerate the design of potential therapeutics. | ||||||
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構造の表示
構造ビューア | 分子: ![]() ![]() |
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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 | ![]() 47801MC ![]() 9e9rC ![]() 9ea7C 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: 516167.469 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
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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: apolipoprotein B-100 / タイプ: COMPLEX / Entity ID: all / 由来: NATURAL |
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分子量 | 値: 550 kDa/nm / 実験値: NO |
由来(天然) | 生物種: ![]() |
緩衝液 | pH: 7.4 |
試料 | 濃度: 2 mg/ml / 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 |
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277.15 K |
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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): 2800 nm / 最小 デフォーカス(公称値): 800 nm / Cs: 2.7 mm / C2レンズ絞り径: 70 µm / アライメント法: COMA FREE |
試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
撮影 | 電子線照射量: 50 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
電子光学装置 | エネルギーフィルター名称: GIF Bioquantum / エネルギーフィルタースリット幅: 10 eV |
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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 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 600000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 9 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 52843 / 対称性のタイプ: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL / Target criteria: cross-correlation coefficient 詳細: The Molecular Dynamics Flexible Fitting protocol was applied using NAMD 3.0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
原子モデル構築 | Source name: AlphaFold / タイプ: in silico model |