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基本情報
登録情報 | データベース: PDB / ID: 9c9u | |||||||||||||||||||||||||||||||||||||||||||||||||||
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タイトル | Cryo-EM structure of the C1q A, B-crt, C peptide full assembly | |||||||||||||||||||||||||||||||||||||||||||||||||||
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![]() | IMMUNE SYSTEM / C1q / complement / collagen / triple helix / cryo-EM | |||||||||||||||||||||||||||||||||||||||||||||||||||
機能・相同性 | ![]() complement component C1 complex / complement component C1q complex / extrinsic component of postsynaptic membrane / negative regulation of macrophage differentiation / synapse pruning / extrinsic component of presynaptic membrane / negative regulation of granulocyte differentiation / vertebrate eye-specific patterning / complement-mediated synapse pruning / collagen trimer ...complement component C1 complex / complement component C1q complex / extrinsic component of postsynaptic membrane / negative regulation of macrophage differentiation / synapse pruning / extrinsic component of presynaptic membrane / negative regulation of granulocyte differentiation / vertebrate eye-specific patterning / complement-mediated synapse pruning / collagen trimer / complement activation / Classical antibody-mediated complement activation / Initial triggering of complement / neuron remodeling / complement activation, classical pathway / Regulation of Complement cascade / astrocyte activation / microglial cell activation / synapse organization / cell-cell signaling / amyloid-beta binding / : / blood microparticle / postsynapse / immune response / innate immune response / synapse / glutamatergic synapse / extracellular space / extracellular region 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: 4.5 Å | |||||||||||||||||||||||||||||||||||||||||||||||||||
![]() | Kreutzberger, M.A. / Yu, L.T. / Egelman, E.H. / Hartgerink, J.D. | |||||||||||||||||||||||||||||||||||||||||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: A Collagen Triple Helix without the Superhelical Twist. 著者: Mark A B Kreutzberger / Le Tracy Yu / Thi H Bui / Maria C Hancu / Michael D Purdy / Tomasz Osinski / Peter M Kasson / Edward H Egelman / Jeffrey D Hartgerink / ![]() 要旨: Collagens are ubiquitous in biology: functioning as the backbone of the extracellular matrix, forming the primary structural components of key immune system complexes, and fulfilling numerous other ...Collagens are ubiquitous in biology: functioning as the backbone of the extracellular matrix, forming the primary structural components of key immune system complexes, and fulfilling numerous other structural roles in a variety of systems. Despite this, there is limited understanding of how triple helices, the basic collagen structural units, pack into collagenous assemblies. Here we use a peptide self-assembly system to design collagenous assemblies based on the C1q collagen-like region. Using cryo-EM we solved a structure of one assembly to 3.5 Å resolution and built an atomic model. From this, we identify a triple helix conformation with no superhelical twist, starkly in contrast to the canonical right-handed triple helix. This nontwisting region allows for unique hydroxyproline stacking between adjacent triple helices and also results in the formation of an exposed cavity with rings of hydrophobic amino acids packed symmetrically. We find no precedent for such an arrangement of collagen triple helices and designed assemblies with substituted amino acids in various locations to probe key stabilizing amino acid interactions in the complex. The stability of these altered complexes behaves as predicted by our atomic model. Our findings, combined with the extremely limited experimental structural data on triple helix packing in the literature, suggest that collagen and collagen-like assemblies may adopt a far more varied conformational landscape than previously appreciated. We hypothesize that this is particularly likely in packed assemblies of triple helices, adjacent to the termini of these helices and at discontinuities in the required Xaa-Yaa-Gly repeating primary sequence, a discontinuity found in the majority of this class of proteins and in many collagen-associated diseases. | |||||||||||||||||||||||||||||||||||||||||||||||||||
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 | ![]() | 91.2 KB | 表示 | ![]() |
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PDB形式 | ![]() | 75.4 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 | ![]() 45371MC ![]() 9c9lC 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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集合体
登録構造単位 | ![]()
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要素
#1: タンパク質・ペプチド | 分子量: 4241.628 Da / 分子数: 6 / 由来タイプ: 合成 / 由来: (合成) ![]() #2: タンパク質・ペプチド | 分子量: 3854.304 Da / 分子数: 6 / 由来タイプ: 合成 / 由来: (合成) ![]() #3: タンパク質・ペプチド | 分子量: 3435.753 Da / 分子数: 6 / 由来タイプ: 合成 / 由来: (合成) ![]() 研究の焦点であるリガンドがあるか | Y | Has protein modification | Y | |
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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: 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: The C1q A, B-crt, C peptide assembly / タイプ: COMPLEX / Entity ID: all / 由来: SYNTHETIC |
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由来(天然) | 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: 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): 3000 nm / 最小 デフォーカス(公称値): 1000 nm |
撮影 | 電子線照射量: 60 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k 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: 4.5 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 44364 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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