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基本情報
登録情報 | データベース: PDB / ID: 9b9j | ||||||||||||
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タイトル | Integrin alpha-5 beta-1 in complex with BIIG2 Fab | ||||||||||||
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![]() | SIGNALING PROTEIN / CELL ADHESION / Integrin / Antibody Fab / Inhibitory | ||||||||||||
機能・相同性 | ![]() integrin alpha8-beta1 complex / : / integrin alpha3-beta1 complex / integrin alpha5-beta1 complex / integrin alpha6-beta1 complex / integrin alpha7-beta1 complex / integrin alpha10-beta1 complex / integrin alpha11-beta1 complex / positive regulation of glutamate uptake involved in transmission of nerve impulse / myoblast fate specification ...integrin alpha8-beta1 complex / : / integrin alpha3-beta1 complex / integrin alpha5-beta1 complex / integrin alpha6-beta1 complex / integrin alpha7-beta1 complex / integrin alpha10-beta1 complex / integrin alpha11-beta1 complex / positive regulation of glutamate uptake involved in transmission of nerve impulse / myoblast fate specification / integrin alpha9-beta1 complex / regulation of collagen catabolic process / cardiac cell fate specification / integrin binding involved in cell-matrix adhesion / integrin alpha4-beta1 complex / cell-cell adhesion mediated by integrin / integrin alpha1-beta1 complex / collagen binding involved in cell-matrix adhesion / Localization of the PINCH-ILK-PARVIN complex to focal adhesions / integrin alpha2-beta1 complex / reactive gliosis / formation of radial glial scaffolds / Other semaphorin interactions / cerebellar climbing fiber to Purkinje cell synapse / Formation of the ureteric bud / positive regulation of fibroblast growth factor receptor signaling pathway / CD40 signaling pathway / Fibronectin matrix formation / calcium-independent cell-matrix adhesion / basement membrane organization / regulation of synapse pruning / integrin alphav-beta1 complex / myelin sheath abaxonal region / CHL1 interactions / RUNX2 regulates genes involved in cell migration / cardiac muscle cell myoblast differentiation / alphav-beta3 integrin-vitronectin complex / MET interacts with TNS proteins / Laminin interactions / leukocyte tethering or rolling / cardiac muscle cell differentiation / germ cell migration / cell projection organization / Platelet Adhesion to exposed collagen / vascular endothelial growth factor receptor 2 binding / myoblast fusion / positive regulation of vascular endothelial growth factor signaling pathway / Elastic fibre formation / mesodermal cell differentiation / cell-substrate junction assembly / platelet-derived growth factor receptor binding / axon extension / myoblast differentiation / cell migration involved in sprouting angiogenesis / Differentiation of Keratinocytes in Interfollicular Epidermis in Mammalian Skin / positive regulation of fibroblast migration / positive regulation of vascular endothelial growth factor receptor signaling pathway / positive regulation of cell-substrate adhesion / wound healing, spreading of epidermal cells / integrin complex / heterophilic cell-cell adhesion via plasma membrane cell adhesion molecules / heterotypic cell-cell adhesion / regulation of spontaneous synaptic transmission / epidermal growth factor receptor binding / lamellipodium assembly / dendrite morphogenesis / sarcomere organization / Molecules associated with elastic fibres / MET activates PTK2 signaling / Basigin interactions / Mechanical load activates signaling by PIEZO1 and integrins in osteocytes / negative regulation of vasoconstriction / leukocyte cell-cell adhesion / cell adhesion mediated by integrin / positive regulation of wound healing / muscle organ development / Syndecan interactions / response to muscle activity / positive regulation of neuroblast proliferation / maintenance of blood-brain barrier / negative regulation of Rho protein signal transduction / positive regulation of sprouting angiogenesis / cell-substrate adhesion / endodermal cell differentiation / homophilic cell adhesion via plasma membrane adhesion molecules / TGF-beta receptor signaling activates SMADs / establishment of mitotic spindle orientation / cleavage furrow / fibronectin binding / negative regulation of anoikis / cellular response to low-density lipoprotein particle stimulus / RHOG GTPase cycle / glial cell projection / intercalated disc / neuroblast proliferation / negative regulation of neuron differentiation / RAC2 GTPase cycle / ECM proteoglycans / RAC3 GTPase cycle / Integrin cell surface interactions 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: 2.6 Å | ||||||||||||
![]() | Nguyen, A. / Azumaya, C.M. / Campbell, M.G. | ||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Structural and functional characterization of integrin α5-targeting antibodies for anti-angiogenic therapy. 著者: Adam Nguyen / Joel B Heim / Gabriele Cordara / Matthew C Chan / Hedda Johannesen / Cristine Charlesworth / Ming Li / Caleigh M Azumaya / Benjamin Madden / Ute Krengel / Alexander Meves / Melody G Campbell / ![]() ![]() 要旨: Integrins are a large family of heterodimeric receptors important for cell adhesion and signaling. Integrin α5β1, also known as the fibronectin receptor, is a key mediator of angiogenesis and its ...Integrins are a large family of heterodimeric receptors important for cell adhesion and signaling. Integrin α5β1, also known as the fibronectin receptor, is a key mediator of angiogenesis and its dysregulation is associated with tumor proliferation, progression, and metastasis. Despite numerous efforts, α5β1-targeting therapeutics have been unsuccessful in large part due to efficacy and off-target effects. To mediate activation and signaling, integrins undergo drastic conformational changes. However, how therapeutics influence or are affected by integrin conformation remains incompletely characterized. Using cell biology, biophysics, and electron microscopy, we shed light on these relationships by characterizing two potentially therapeutic anti-α5β1 antibodies, BIIG2 and MINT1526A. We show that both antibodies bind α5β1 with nanomolar affinity and reduce angiogenesis . We demonstrate BIIG2 reduces tumor growth in two human xenograft mouse models and exhibits a strong specificity for connective tissue-resident fibroblasts and melanoma cells. Using electron microscopy, we map out the molecular interfaces mediating the integrin-antibody interactions and reveal that although both antibodies have overlapping epitopes and block fibronectin binding via steric hindrance, the effect on the conformational equilibrium is drastically different. While MINT1526A constricts α5β1's range of flexibility, BIIG2 binds without restricting the available conformational states. These mechanistic insights, coupled with the functional analysis, guide which aspects should be prioritized to avoid off-target effects or partial agonism in the design of future integrin-targeted therapeutics. | ||||||||||||
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 | ![]() | 433.8 KB | 表示 | ![]() |
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PDB形式 | ![]() | 343.4 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
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リンク
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集合体
登録構造単位 | ![]()
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1 |
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要素
-タンパク質 , 2種, 2分子 AB
#1: タンパク質 | 分子量: 108693.734 Da / 分子数: 1 / 由来タイプ: 組換発現 詳細: Integrin alpha-5 ectodomain with cleaved, HRV 3C cute site, acid coil and Strep-Tag II. 由来: (組換発現) ![]() 発現宿主: ![]() ![]() 参照: UniProt: P08648 |
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#2: タンパク質 | 分子量: 80653.781 Da / 分子数: 1 / 由来タイプ: 組換発現 詳細: Integrin beta-1 ectodomain with cleaved HRV 3C cut site, base coil, and 6x His-tag. 由来: (組換発現) ![]() 発現宿主: ![]() ![]() 参照: UniProt: P05556 |
-抗体 , 2種, 2分子 HL
#3: 抗体 | 分子量: 23400.129 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
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#4: 抗体 | 分子量: 23421.041 Da / 分子数: 1 / 由来タイプ: 天然 / 由来: (天然) ![]() ![]() |
-糖 , 5種, 11分子 
#5: 多糖 | beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose #6: 多糖 | alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D- ...alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose | #7: 多糖 | #8: 多糖 | alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1- ...alpha-D-mannopyranose-(1-3)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose | #10: 糖 | ChemComp-NAG / | |
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-非ポリマー , 1種, 7分子 
#9: 化合物 | ChemComp-CA / |
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-詳細
研究の焦点であるリガンドがあるか | N |
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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: Protein complex of integrin alpha-5 beta-1 with BIIG2 Fab タイプ: COMPLEX / Entity ID: #1-#4 / 由来: RECOMBINANT | ||||||||||||||||||||
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分子量 | 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 / 詳細: 20mM Tris-HCL, 150mM NaCl, 5mM CaCl2 | ||||||||||||||||||||
緩衝液成分 |
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試料 | 濃度: 0.15 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: GOLD / 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 K |
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電子顕微鏡撮影
顕微鏡 | モデル: TFS GLACIOS |
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電子銃 | 電子線源: ![]() |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 36000 X / 最大 デフォーカス(公称値): 1800 nm / 最小 デフォーカス(公称値): 1400 nm / Cs: 2.7 mm |
試料ホルダ | 凍結剤: NITROGEN |
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: 3656 |
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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: 2425530 | ||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 2.6 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 317066 / 対称性のタイプ: POINT | ||||||||||||||||||||||||||||||||||||
原子モデル構築 | B value: 93 / プロトコル: RIGID BODY FIT / 空間: REAL / Target criteria: Cross-correlation coefficient 詳細: Initial local fitting was done using ChimeraX and then Phenix, ISOLDE and COOT for flexible fitting and modeling. | ||||||||||||||||||||||||||||||||||||
原子モデル構築 | 3D fitting-ID: 1 / Accession code: 3VI3 / Initial refinement model-ID: 1 / PDB-ID: 3VI3 / Source name: PDB / タイプ: experimental model
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拘束条件 |
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