+データを開く
-基本情報
登録情報 | データベース: SASBDB / ID: SASDA35 |
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試料 | SeZinT-SeZnuA complex
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機能・相同性 | : / : 機能・相同性情報 |
生物種 | Salmonella enterica subsp. enterica serovar Nchanga (サルモネラ菌) Salmonella enterica subsp. enterica serovar Enteritidis (サルモネラ菌) |
引用 | ジャーナル: Biochim Biophys Acta / 年: 2014 タイトル: The Salmonella enterica ZinT structure, zinc affinity and interaction with the high-affinity uptake protein ZnuA provide insight into the management of periplasmic zinc. 著者: Andrea Ilari / Flaminia Alaleona / Giancarlo Tria / Patrizia Petrarca / Andrea Battistoni / Carlotta Zamparelli / Daniela Verzili / Mattia Falconi / Emilia Chiancone / 要旨: BACKGROUND: In Gram-negative bacteria the ZnuABC transporter ensures adequate zinc import in Zn(II)-poor environments, like those encountered by pathogens within the infected host. Recently, the ...BACKGROUND: In Gram-negative bacteria the ZnuABC transporter ensures adequate zinc import in Zn(II)-poor environments, like those encountered by pathogens within the infected host. Recently, the metal-binding protein ZinT was suggested to operate as an accessory component of ZnuABC in periplasmic zinc recruitment. Since ZinT is known to form a ZinT-ZnuA complex in the presence of Zn(II) it was proposed to transfer Zn(II) to ZnuA. The present work was undertaken to test this claim. 手法: ZinT and its structural relationship with ZnuA have been characterized by multiple biophysical techniques (X-ray crystallography, SAXS, analytical ultracentrifugation, fluorescence spectroscopy). RESULTS: The metal-free and metal-bound crystal structures of Salmonella enterica ZinT show one Zn(II) binding site and limited structural changes upon metal removal. Spectroscopic titrations with ...RESULTS: The metal-free and metal-bound crystal structures of Salmonella enterica ZinT show one Zn(II) binding site and limited structural changes upon metal removal. Spectroscopic titrations with Zn(II) yield a KD value of 22±2nM for ZinT, while those with ZnuA point to one high affinity (KD<20nM) and one low affinity Zn(II) binding site (KD in the micromolar range). Sedimentation velocity experiments established that Zn(II)-bound ZinT interacts with ZnuA, whereas apo-ZinT does not. The model of the ZinT-ZnuA complex derived from small angle X-ray scattering experiments points to a disposition that favors metal transfer as the metal binding cavities of the two proteins face each other. CONCLUSIONS: ZinT acts as a Zn(II)-buffering protein that delivers Zn(II) to ZnuA. GENERAL SIGNIFICANCE: Knowledge of the ZinT-ZnuA relationship is crucial for understanding bacterial Zn(II) uptake. |
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-構造の表示
構造ビューア | 分子: MolmilJmol/JSmol |
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-ダウンロードとリンク
-モデル
モデル #91 | タイプ: mix / ダミー原子の半径: 1.90 A / カイ2乗値: 1.317904 Omokage検索でこの集合体の類似形状データを探す (詳細) |
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モデル #92 | タイプ: dummy / ダミー原子の半径: 1.90 A Omokage検索でこの集合体の類似形状データを探す (詳細) |
-試料
試料 | 名称: SeZinT-SeZnuA complex / Sample MW: 56.49 kDa / 試料濃度: 0.17-5.00 / Entity id: 75 / 76 |
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バッファ | 名称: 50 mM HEPES 50 mM KCl / 濃度: 50.00 mM / PK: 7 / pH: 7.5 コメント: 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid 組成: KCl 50.000 mM |
要素 #75 | 名称: ZinT / タイプ: protein 記述: High-affinity zinc transporter periplasmic component 分子量: 33.25 / 分子数: 1 / 由来: Salmonella enterica subsp. enterica serovar Nchanga / 参照: UniProt: V2JZU2 配列: FAALSAALWG SATQAADAAV VASLKPLGFI ASAIADGVTD TQVLLPDGAS EHDYSLRPSD VKRLQGADLV VWVGPEMEAF MEKSVRNIPD NKQVTIAQLA DVKPLLMKGA DDDEDEHAHT GADEEKGDVH HHHGEYNMHL WLSPEIARAT AVAIHEKLVE LMPQSRAKLD ...配列: FAALSAALWG SATQAADAAV VASLKPLGFI ASAIADGVTD TQVLLPDGAS EHDYSLRPSD VKRLQGADLV VWVGPEMEAF MEKSVRNIPD NKQVTIAQLA DVKPLLMKGA DDDEDEHAHT GADEEKGDVH HHHGEYNMHL WLSPEIARAT AVAIHEKLVE LMPQSRAKLD ANLKDFEAQL AATDKQVGNE LAPLKGKGYF VFHDAYGYYE KHYGLTPLGH FTVNPEIQPG AQRLHEIRTQ LVEQKATCVF AEPQFRPAVV EAVARGTSVR MGTLDPLGTN IKLGKTSYSA FLSQLANQYA SCLKGD |
要素 #76 | 名称: SeZnuA / タイプ: protein / 記述: Zinc/cadmium-binding protein / 分子量: 23.24 / 分子数: 1 由来: Salmonella enterica subsp. enterica serovar Enteritidis 参照: UniProt: L6R5I5 配列: MLLVNSPAFA HGHHAHGAPM TEVEQKAAAG VFDDANVRDR ALTDWDGMWQ SVYPYLVSGE LDPVFRQKAK KDPEKTFEDI KAYYRKGYVT NVETIGIENG VIEFHRDNNV ASCKYNYAGY KILTYASGKK GVRYLFECKD ANSKAPKYVQ FSDHIIAPRK SAHFHIFMGN ...配列: MLLVNSPAFA HGHHAHGAPM TEVEQKAAAG VFDDANVRDR ALTDWDGMWQ SVYPYLVSGE LDPVFRQKAK KDPEKTFEDI KAYYRKGYVT NVETIGIENG VIEFHRDNNV ASCKYNYAGY KILTYASGKK GVRYLFECKD ANSKAPKYVQ FSDHIIAPRK SAHFHIFMGN TSQQALLQEM ENWPTYYPYQ LKANEVVDEM LHH |
-実験情報
ビーム | 設備名称: ESRF BM29 / 地域: Grenoble / 国: France / 線源: X-ray synchrotron / 波長: 0.93 Å / スペクトロメータ・検出器間距離: 2.43 mm | |||||||||||||||||||||||||||
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検出器 | 名称: Pilatus 1M | |||||||||||||||||||||||||||
スキャン | タイトル: SeZinT-SeZnuA / 測定日: 2013年5月9日 / 保管温度: 4 °C / セル温度: 4 °C / 照射時間: 1 sec. / フレーム数: 10 / 単位: 1/nm /
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距離分布関数 P(R) | ソフトウェア P(R): GNOM 4.6 / ポイント数: 456 /
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結果 | カーブのタイプ: extrapolated / Standard: BSA /
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