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Type: Artigo de periódico
Title: Heterometallic manganese/zinc-phytate complex as a model compound for metal storage in wheat grains
Author: Rodrigues-Filho, UP
Vaz, S
Felicissimo, MP
Scarpellini, M
Cardoso, DR
Vinhas, RCJ
Landers, R
Schneider, JF
McGarvey, BR
Andersen, ML
Skibsted, LH
Abstract: Myo-inositol-1,2.3,4,5.6-hexakisphosphate, also known as phytate, is a natural metal chelate present in cereals, an important feedstock worldwide. This article reports the characterization of three metal storage model complexes: the homometallic Mn(II) myo-inositol-1,2,3,4,5,6-hexakisphosphate (IP6), the heterometallic Zn(II), Mn(II) analogue Na4MnZn4(C6H6O24P6) (NO3)(2)-8H(2)O (MnZn(4)IP6) and the homometallic Zn(II) metal complex Na3Zn5(C6H6O24P6)OH-9H(2)O (Zn(5)IP6). The techniques of high-resolution Na-23, C-13 and P-31 NMR, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) were applied in this study. The complexation of Zn(II) and Mn(II) by phosphate groups of IP6 is demonstrated by NMR and XPS results. C-13 NMR results show a conformation for IP6 consisting of five equatorial phosphate groups to one axial group showing only one chemical environment for Zn and two for Mn, when characterized by XPS and EPR, in both Mn complexes. These results support, for the first time, a probable supramacromolecular structure for phytate complexes of transition metals. Based on the similarity between the EPR spectra of wheat seeds and that of the MnZn(4)IP6 compound, the manganese storage centers in wheat grains can be assigned to similar heterometallic phytate complexes. (c) 2005 Elsevier Inc. All rights reserved.
Subject: wheat
manganese storage compounds
Zn(II) storage compounds
metal storage in plants
manganese bioavailability
Country: EUA
Editor: Elsevier Science Inc
Citation: Journal Of Inorganic Biochemistry. Elsevier Science Inc, v. 99, n. 10, n. 1973, n. 1982, 2005.
Rights: fechado
Identifier DOI: 10.1016/j.jinorgbio.2005.06.014
Date Issue: 2005
Appears in Collections:Unicamp - Artigos e Outros Documentos

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