P22 coat protein / designed protein / VIRUS LIKE PARTICLE
機能・相同性
Major capsid protein Gp5 / P22 coat protein - gene protein 5 / viral procapsid / viral procapsid maturation / T=7 icosahedral viral capsid / viral capsid / identical protein binding / Major capsid protein
ジャーナル: Adv Healthc Mater / 年: 2024 タイトル: A pH-Responsive Virus-Like Particle as a Protein Cage for a Targeted Delivery. 著者: Kwan-Jip Kim / Gijeong Kim / Jin-Ho Bae / Ji-Joon Song / Hak-Sung Kim / 要旨: A stimuli-responsive protein self-assembly offers promising utility as a protein nanocage for biotechnological and medical applications. Herein, the development of a virus-like particle (VLP) that ...A stimuli-responsive protein self-assembly offers promising utility as a protein nanocage for biotechnological and medical applications. Herein, the development of a virus-like particle (VLP) that undergoes a transition between assembly and disassembly under a neutral and acidic pH, respectively, for a targeted delivery is reported. The structure of the bacteriophage P22 coat protein is used for the computational design of coat subunits that self-assemble into a pH-responsive VLP. Subunit designs are generated through iterative computational cycles of histidine substitutions and evaluation of the interaction energies among the subunits under an acidic and neutral pH. The top subunit designs are tested and one that is assembled into a VLP showing the highest pH-dependent structural transition is selected. The cryo-EM structure of the VLP is determined, and the structural basis of a pH-triggered disassembly is delineated. The utility of the designed VLP is exemplified through the targeted delivery of a cytotoxic protein cargo into tumor cells in a pH-dependent manner. These results provide strategies for the development of self-assembling protein architectures with new functionality for diverse applications.
モデル: Quantifoil R1.2/1.3 / 材質: COPPER / メッシュ: 300 / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 時間: 60 sec. / 詳細: The grid was glow discharged at 15 mA for 1 min.
凍結
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 288 K / 装置: FEI VITROBOT MARK IV
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電子顕微鏡法
顕微鏡
TFS GLACIOS
撮影
フィルム・検出器のモデル: FEI FALCON III (4k x 4k) 検出モード: COUNTING / 撮影したグリッド数: 1 / 実像数: 1654 / 平均露光時間: 52.69 sec. / 平均電子線量: 40.0 e/Å2
電子線
加速電圧: 200 kV / 電子線源: FIELD EMISSION GUN
電子光学系
C2レンズ絞り径: 70.0 µm / 照射モード: OTHER / 撮影モード: BRIGHT FIELD / Cs: 2.7 mm 最大 デフォーカス(公称値): 2.8000000000000003 µm 最小 デフォーカス(公称値): 1.2 µm / 倍率(公称値): 92000
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画像解析
粒子像選択
選択した数: 25282
初期モデル
モデルのタイプ: INSILICO MODEL
最終 再構成
解像度のタイプ: BY AUTHOR / 解像度: 4.02 Å / 解像度の算出法: FSC 0.143 CUT-OFF / ソフトウェア - 名称: PHENIX ソフトウェア - 詳細: density modification was carried out at PHENIX 使用した粒子像数: 3320