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基本情報
登録情報 | データベース: SASBDB / ID: SASDAW6 |
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![]() | Iron-sulfur cluster assembly scaffold IscU monomer
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機能・相同性 | ![]() IscS-IscU complex / L-cysteine catabolic process / iron-sulfur cluster assembly / ferrous iron binding / 2 iron, 2 sulfur cluster binding / 4 iron, 4 sulfur cluster binding / intracellular iron ion homeostasis / copper ion binding / zinc ion binding / identical protein binding ...IscS-IscU complex / L-cysteine catabolic process / iron-sulfur cluster assembly / ferrous iron binding / 2 iron, 2 sulfur cluster binding / 4 iron, 4 sulfur cluster binding / intracellular iron ion homeostasis / copper ion binding / zinc ion binding / identical protein binding / cytosol / cytoplasm 類似検索 - 分子機能 |
生物種 | ![]() ![]() |
![]() | ![]() タイトル: Structural bases for the interaction of frataxin with the central components of iron-sulphur cluster assembly. 著者: Filippo Prischi / Petr V Konarev / Clara Iannuzzi / Chiara Pastore / Salvatore Adinolfi / Stephen R Martin / Dmitri I Svergun / Annalisa Pastore / ![]() 要旨: Reduced levels of frataxin, an essential protein of as yet unknown function, are responsible for causing the neurodegenerative pathology Friedreich's ataxia. Independent reports have linked frataxin ...Reduced levels of frataxin, an essential protein of as yet unknown function, are responsible for causing the neurodegenerative pathology Friedreich's ataxia. Independent reports have linked frataxin to iron-sulphur cluster assembly through interactions with the two central components of this machinery: desulphurase Nfs1/IscS and the scaffold protein Isu/IscU. In this study, we use a combination of biophysical methods to define the structural bases of the interaction of CyaY (the bacterial orthologue of frataxin) with the IscS/IscU complex. We show that CyaY binds IscS as a monomer in a pocket between the active site and the IscS dimer interface. Recognition does not require iron and occurs through electrostatic interactions of complementary charged residues. Mutations at the complex interface affect the rates of enzymatic cluster formation. CyaY binding strengthens the affinity of the IscS/IscU complex. Our data suggest a new paradigm for understanding the role of frataxin as a regulator of IscS functions. |
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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
-モデル
モデル #223 | ![]() タイプ: atomic / ソフトウェア: crysol / ダミー原子の半径: 1.90 A / 対称性: P1 / カイ2乗値: 2.199289 ![]() |
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モデル #224 | ![]() タイプ: dummy / ソフトウェア: DAMMIF / ダミー原子の半径: 2.30 A / 対称性: P1 / カイ2乗値: 1.065024 ![]() |
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試料
![]() | 名称: Iron-sulfur cluster assembly scaffold IscU monomer / 試料濃度: 2.5 mg/ml |
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バッファ | 名称: Tris-HCl / 濃度: 20.00 mM / pH: 8 / 組成: 150 mM NaCl and 10 mM β-mercaptoethanol |
要素 #136 | タイプ: protein / 記述: Iron-sulfur cluster assembly scaffold protein IscU / 分子量: 14.464 / 分子数: 1 / 由来: Escherichia coli / 参照: UniProt: P0ACD4 配列: MAYSEKVIDH YENPRNVGSL DKKDSNVGTG MVGAPACGDV MQLQIKVDDN GIIEDAKFKT YGCGSAIASS SLITEWVKGK SLEEAGAIKN SQIAEELELP PVKVHCSILA EDAIKAAIAD YKAKQGLEHH HHHH |
-実験情報
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検出器 | 名称: Pilatus 1M-W / Pixsize x: 0.172 mm | |||||||||||||||||||||||||||
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距離分布関数 P(R) |
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結果 | コメント: Reduced levels of frataxin, an essential protein of as yet unknown function, are responsible for causing the neurodegenerative pathology Friedreich’s ataxia. Independent reports have ...コメント: Reduced levels of frataxin, an essential protein of as yet unknown function, are responsible for causing the neurodegenerative pathology Friedreich’s ataxia. Independent reports have linked frataxin to iron–sulphur cluster assembly through interactions with the two central components of this machinery: desulphurase Nfs1/IscS and the scaffold protein Isu/IscU. In this study, we use a combination of biophysical methods to define the structural bases of the interaction of CyaY (the bacterial orthologue of frataxin) with the IscS/IscU complex. We show that CyaY binds IscS as a monomer in a pocket between the active site and the IscS dimer interface. Recognition does not require iron and occurs through electrostatic interactions of complementary charged residues. Mutations at the complex interface affect the rates of enzymatic cluster formation. CyaY binding strengthens the affinity of the IscS/IscU complex. Our data suggest a new paradigm for understanding the role of frataxin as a regulator of IscS functions.
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