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基本情報
登録情報 | データベース: PDB / ID: 9bee | |||||||||||||||
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タイトル | alphaB-crystallin N-terminal IXI variant in a fibril state | |||||||||||||||
![]() | (Alpha-crystallin B chain) x 2 | |||||||||||||||
![]() | CHAPERONE / small heat-shock protein fibril proteostasis cataract | |||||||||||||||
機能・相同性 | ![]() microtubule polymerization or depolymerization / negative regulation of intracellular transport / apoptotic process involved in morphogenesis / regulation of programmed cell death / tubulin complex assembly / cardiac myofibril / structural constituent of eye lens / negative regulation of amyloid fibril formation / M band / lens development in camera-type eye ...microtubule polymerization or depolymerization / negative regulation of intracellular transport / apoptotic process involved in morphogenesis / regulation of programmed cell death / tubulin complex assembly / cardiac myofibril / structural constituent of eye lens / negative regulation of amyloid fibril formation / M band / lens development in camera-type eye / muscle organ development / actin filament bundle / negative regulation of reactive oxygen species metabolic process / HSF1-dependent transactivation / negative regulation of protein-containing complex assembly / stress-activated MAPK cascade / muscle contraction / synaptic membrane / cellular response to gamma radiation / negative regulation of cell growth / response to hydrogen peroxide / Z disc / unfolded protein binding / protein folding / response to estradiol / amyloid-beta binding / response to heat / protein refolding / microtubule binding / dendritic spine / perikaryon / response to hypoxia / lysosome / protein stabilization / axon / negative regulation of gene expression / negative regulation of DNA-templated transcription / protein-containing complex binding / negative regulation of apoptotic process / structural molecule activity / cell surface / protein homodimerization activity / protein-containing complex / mitochondrion / extracellular exosome / nucleoplasm / metal ion binding / identical protein binding / nucleus / cytosol / cytoplasm 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 | |||||||||||||||
![]() | McFarland, R. / Reichow, S.L. | |||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Dynamic fibrillar assembly of αB-crystallin induced by perturbation of the conserved NT-IXI motif resolved by cryo-EM. 著者: Russell McFarland / Rozhan Noroozi / Adam P Miller / Steve L Reichow / ![]() 要旨: αB-crystallin is an archetypical member of the small heat shock proteins (sHSPs) vital for cellular proteostasis and mitigating protein misfolding diseases. Gaining insights into the principles ...αB-crystallin is an archetypical member of the small heat shock proteins (sHSPs) vital for cellular proteostasis and mitigating protein misfolding diseases. Gaining insights into the principles defining their molecular organization and chaperone function have been hindered by intrinsic dynamic properties and limited high-resolution structural analysis. To disentangle the mechanistic underpinnings of these dynamical properties, we ablate a conserved IXI-motif located within the N-terminal (NT) domain of human αB-crystallin implicated in subunit exchange dynamics and client sequestration. This results in a profound structural transformation, from highly polydispersed caged-like native assemblies into an elongated fibril state amenable to high-resolution cryo-EM analysis. The reversible nature of this variant facilitates interrogation of functional effects due to perturbation of the NT-IXI motif in both the native-like oligomer and fibril states. Together, our investigations unveil several features thought to be key mechanistic attributes to sHSPs and point to a critical significance of the NT-IXI motif in αB-crystallin assembly, polydispersity, and chaperone activity. | |||||||||||||||
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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PDBx/mmCIF形式 | ![]() | 83.7 KB | 表示 | ![]() |
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PDB形式 | ![]() | 64.2 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 | ![]() 44477MC 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: 9944.200 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: 12106.734 Da / 分子数: 1 / 由来タイプ: 組換発現 詳細: 7 residues are modeled as unknown as they are identifiable in the EM volume with 1 being able to be assigned an identity with intermediate confidence. We cannot clearly identify which ...詳細: 7 residues are modeled as unknown as they are identifiable in the EM volume with 1 being able to be assigned an identity with intermediate confidence. We cannot clearly identify which protomer the bound peptide corresponds to though it is believed to play a key role in the oligomerization. We have opted to include the peptide as part of Chain A with numbering based on our best approximation from related protein species and mass spec data published by others. The residues are labelled as unknown to reflect our low confidence of the identity of the peptide. 由来: (組換発現) ![]() ![]() ![]() |
Has protein modification | N |
配列の詳細 | The complete sample sequence is MDAAAHHPWIRRPFFPFHSPSRLFDQFFGEHLLESDLFPTSTSLSPFYLRPPSFLRAPSW ...The complete sample sequence is MDAAAHHPWI |
-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: Asymmetric dimer of alphaB-crystallin filament state formed by an N-terminal IXI variant タイプ: COMPLEX / Entity ID: #1 / 由来: RECOMBINANT | ||||||||||||||||||||
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分子量 | 値: 40.3 kDa/nm / 実験値: NO | ||||||||||||||||||||
由来(天然) | 生物種: ![]() | ||||||||||||||||||||
由来(組換発現) | 生物種: ![]() ![]() | ||||||||||||||||||||
緩衝液 | pH: 7.4 | ||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 0.5 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 / グリッドのタイプ: Quantifoil | ||||||||||||||||||||
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 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): 2000 nm / 最小 デフォーカス(公称値): 500 nm / Cs: 2.3 mm / 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) / 撮影したグリッド数: 1 / 実像数: 10654 |
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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: 31.6 ° / 軸方向距離/サブユニット: 39.9 Å / らせん対称軸の対称性: D2 | ||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 2201394 | ||||||||||||||||||||||||||||||
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: 1393386 / 対称性のタイプ: HELICAL | ||||||||||||||||||||||||||||||
原子モデル構築 | プロトコル: FLEXIBLE FIT / 空間: REAL | ||||||||||||||||||||||||||||||
原子モデル構築 | PDB-ID: 2WJ7 Accession code: 2WJ7 / Source name: PDB / タイプ: experimental model | ||||||||||||||||||||||||||||||
拘束条件 |
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