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Structural study of the zinc and cadmium complexes of a type 2 plant (Quercus suber) metallothionein: insights by vibrational spectroscopy.

Identifieur interne : 000290 ( Main/Exploration ); précédent : 000289; suivant : 000291

Structural study of the zinc and cadmium complexes of a type 2 plant (Quercus suber) metallothionein: insights by vibrational spectroscopy.

Auteurs : Jordi Domènech [Espagne] ; Anna Tinti ; Mercè Capdevila ; Silvia Atrian ; Armida Torreggiani

Source :

RBID : pubmed:17377964

Descripteurs français

English descriptors

Abstract

Zn- and Cd-complexes of Quercus suber metallothionein (QsMT) were obtained by in vivo-synthesis, in order to obtain physiologically representative aggregates, and characterized by spectrometric and spectroscopic methods. The secondary structure elements and the coordination environments of the metal binding sites of the two aggregates were determined, as well as the main metal-containing species formed. The results obtained from the analysis of the Raman and IR spectra reveal that these metal-MT complexes predominantly contain beta-sheet elements (about 60%), whereas they lack alpha-helices. These structural features slightly depend on the divalent metal bound. In particular, Cd(II) binding to QsMT induces a slight increase of the beta-sheet percentage, as well as a decrease in beta-turn elements with respect to Zn(II) binding. Conversely, the in vivo capability of QsMT to inglobe metal and sulfide ions is metal-depending. Spectroscopic vibrational data also confirm the presence of sulfide ligands in the metal clusters of both Zn- and Cd-QsMT, while the participation of the spacer His residue in metal coordination was only found in Cd-QsMT, in agreement with the CD results. Overall data suggest different coordination environments for Zn(II) and Cd(II) ions in QsMT.

DOI: 10.1002/bip.20729
PubMed: 17377964


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<term>Histidine (chemistry)</term>
<term>Ligands (MeSH)</term>
<term>Metallothionein (chemistry)</term>
<term>Metallothionein (metabolism)</term>
<term>Models, Chemical (MeSH)</term>
<term>Molecular Sequence Data (MeSH)</term>
<term>Plant Proteins (chemistry)</term>
<term>Plant Proteins (metabolism)</term>
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<term>Protein Structure, Secondary (MeSH)</term>
<term>Quercus (chemistry)</term>
<term>Spectrophotometry, Infrared (MeSH)</term>
<term>Spectroscopy, Fourier Transform Infrared (MeSH)</term>
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<term>Zinc (metabolism)</term>
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<term>Données de séquences moléculaires (MeSH)</term>
<term>Histidine (composition chimique)</term>
<term>Liaison aux protéines (MeSH)</term>
<term>Ligands (MeSH)</term>
<term>Modèles chimiques (MeSH)</term>
<term>Métallothionéine (composition chimique)</term>
<term>Métallothionéine (métabolisme)</term>
<term>Protéines végétales (composition chimique)</term>
<term>Protéines végétales (métabolisme)</term>
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<term>Spectrophotométrie IR (MeSH)</term>
<term>Spectroscopie infrarouge à transformée de Fourier (MeSH)</term>
<term>Structure secondaire des protéines (MeSH)</term>
<term>Stéréoisomérie (MeSH)</term>
<term>Séquence d'acides aminés (MeSH)</term>
<term>Zinc (métabolisme)</term>
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<term>Zinc</term>
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<div type="abstract" xml:lang="en">Zn- and Cd-complexes of Quercus suber metallothionein (QsMT) were obtained by in vivo-synthesis, in order to obtain physiologically representative aggregates, and characterized by spectrometric and spectroscopic methods. The secondary structure elements and the coordination environments of the metal binding sites of the two aggregates were determined, as well as the main metal-containing species formed. The results obtained from the analysis of the Raman and IR spectra reveal that these metal-MT complexes predominantly contain beta-sheet elements (about 60%), whereas they lack alpha-helices. These structural features slightly depend on the divalent metal bound. In particular, Cd(II) binding to QsMT induces a slight increase of the beta-sheet percentage, as well as a decrease in beta-turn elements with respect to Zn(II) binding. Conversely, the in vivo capability of QsMT to inglobe metal and sulfide ions is metal-depending. Spectroscopic vibrational data also confirm the presence of sulfide ligands in the metal clusters of both Zn- and Cd-QsMT, while the participation of the spacer His residue in metal coordination was only found in Cd-QsMT, in agreement with the CD results. Overall data suggest different coordination environments for Zn(II) and Cd(II) ions in QsMT.</div>
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<AbstractText>Zn- and Cd-complexes of Quercus suber metallothionein (QsMT) were obtained by in vivo-synthesis, in order to obtain physiologically representative aggregates, and characterized by spectrometric and spectroscopic methods. The secondary structure elements and the coordination environments of the metal binding sites of the two aggregates were determined, as well as the main metal-containing species formed. The results obtained from the analysis of the Raman and IR spectra reveal that these metal-MT complexes predominantly contain beta-sheet elements (about 60%), whereas they lack alpha-helices. These structural features slightly depend on the divalent metal bound. In particular, Cd(II) binding to QsMT induces a slight increase of the beta-sheet percentage, as well as a decrease in beta-turn elements with respect to Zn(II) binding. Conversely, the in vivo capability of QsMT to inglobe metal and sulfide ions is metal-depending. Spectroscopic vibrational data also confirm the presence of sulfide ligands in the metal clusters of both Zn- and Cd-QsMT, while the participation of the spacer His residue in metal coordination was only found in Cd-QsMT, in agreement with the CD results. Overall data suggest different coordination environments for Zn(II) and Cd(II) ions in QsMT.</AbstractText>
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