National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
1R24GM154186
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01-GM138884
米国
引用
ジャーナル: J Am Chem Soc / 年: 2026 タイトル: Computational Design of a Highly Stable Dicopper Catechol Oxidase. 著者: Vanessa H Eng / Sarah M Narehood / Yiying Li / Mauro Gascón / Alexander M Hoffnagle / Angela A Shiau / Manny Semonis / Michael T Green / R David Britt / F Akif Tezcan / 要旨: Type 3 (T3) Cu proteins play essential roles in binding and activating molecular oxygen (O) and are prevalent across all domains of life. Despite sharing the same coordination motif, T3 Cu proteins ...Type 3 (T3) Cu proteins play essential roles in binding and activating molecular oxygen (O) and are prevalent across all domains of life. Despite sharing the same coordination motif, T3 Cu proteins display divergent functions: hemocyanin transports O, while tyrosinase catalyzes the hydroxylation of monophenols and the subsequent oxidation of diphenols and catechol oxidase oxidizes only diphenols. Here, we report the design and characterization of a di-Cu protein (Cu-HC4) inspired by the active sites of natural T3 Cu proteins to investigate the structural features that facilitate catalytic oxidase activity. Cu-HC4 is roughly 1/5th the size of the commercially available mushroom tyrosinase and shares only around 20% sequence identity with the T3 Cu protein templates. Notably, Cu-HC4 displays high thermostability and exhibits diphenol oxidation activity at ambient and elevated temperatures (≥60 °C). Cu-HC4 also initiates the formation of melanin polymers, mimicking melanin biosynthesis of natural tyrosinases. Mechanistic investigations demonstrate that Cu-HC4 utilizes both Cu centers cooperatively for diphenol oxidation and requires O for catalysis like natural Cu oxidases but follows a distinct catalytic pathway compared to those enzymes. Cryo-EM characterization of a tetrameric form of HC4 reveals slight deviations in the relative positions of the active site His residues that may account for differences in reactivity between Cu-HC4 and natural T3 Cu enzymes.
履歴
登録
2025年10月21日
登録サイト: RCSB / 処理サイト: RCSB
改定 1.0
2026年2月25日
Provider: repository / タイプ: Initial release
改定 1.0
2026年2月25日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2026年2月25日
Data content type: FSC / Data content type: FSC / Provider: repository / タイプ: Initial release
改定 1.0
2026年2月25日
Data content type: Half map / Part number: 1 / Data content type: Half map / Provider: repository / タイプ: Initial release
改定 1.0
2026年2月25日
Data content type: Half map / Part number: 2 / Data content type: Half map / Provider: repository / タイプ: Initial release
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2026年2月25日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2026年2月25日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Database references / Experimental summary / Data content type: EM metadata / EM metadata / カテゴリ: citation / em_admin / Data content type: EM metadata / EM metadata / EM metadata Item: _citation.pdbx_database_id_PubMed / _citation.title / _em_admin.last_update
Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Database references / Experimental summary / Data content type: EM metadata / EM metadata / カテゴリ: citation / em_admin Data content type: EM metadata / EM metadata ...EM metadata / EM metadata / EM metadata / EM metadata Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _em_admin.last_update
モード: BRIGHT FIELD / 倍率(公称値): 105000 X / 最大 デフォーカス(公称値): 2500 nm / 最小 デフォーカス(公称値): 1500 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) 詳細: 9030 micrographs were collected with an untilted stage, and 6556 micrographs were collected at a 30 degree tilt.
電子光学装置
エネルギーフィルター名称: GIF Bioquantum
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解析
EMソフトウェア
ID
名称
バージョン
カテゴリ
1
cryoSPARC
4.6.0
粒子像選択
2
EPU
画像取得
4
cryoSPARC
4.6.0
CTF補正
9
cryoSPARC
4.6.0
初期オイラー角割当
10
cryoSPARC
4.6.0
最終オイラー角割当
12
cryoSPARC
4.6.0
3次元再構成
13
PHENIX
モデル精密化
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: 1246974
対称性
点対称性: C1 (非対称)
3次元再構成
解像度: 4.34 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 108599 / アルゴリズム: FOURIER SPACE / 対称性のタイプ: POINT