Heterometallic manganese/zinc-phytate complex as a model compound for metal storage in wheat grains

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)...

Full description

Saved in:

Bibliographic Details
Published in:	Journal of inorganic biochemistry Vol. 99; no. 10; pp. 1973 - 1982
Main Authors:	Rodrigues-Filho, Ubirajara P., Vaz, Silvio, Felicissimo, Marcella P., Scarpellini, Marciela, Cardoso, Daniel R., Vinhas, Rita C.J., Landers, Richard, Schneider, Jose F., McGarvey, Bruce R., Andersen, Mogens L., Skibsted, Leif H.
Format:	Journal Article
Language:	English
Published:	United States Elsevier Inc 01-10-2005
Subjects:	Chelating Agents - chemistry EPR Macromolecular Substances Magnetic Resonance Spectroscopy Manganese - chemistry Manganese bioavailability Manganese storage compounds MAS NMR Metal storage in plants Models, Chemical Myo-inositol-1,2,3,4,5,6-hexakisphosphate Phytate Phytic Acid - chemistry Seeds - chemistry Triticum - chemistry Wheat XPS Zinc - chemistry Zn(II) storage compounds Myo-inositol-1,2,3,4,5,6-hexakisphosphate Manganese bioavailability Manganese storage compounds Phytate EPR XPS Zn(II) storage compounds Wheat MAS NMR Metal storage in plants
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	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 Na 4MnZn 4(C 6H 6O 24P 6) · (NO 3) 2 · 8H 2O (MnZn 4IP6) and the homometallic Zn(II) metal complex Na 3Zn 5(C 6H 6O 24P 6)OH · 9H 2O (Zn 5IP6). The techniques of high-resolution 23Na, 13C and 31P 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. 13C 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 4IP6 compound, the manganese storage centers in wheat grains can be assigned to similar heterometallic phytate complexes.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0162-0134 1873-3344
DOI:	10.1016/j.jinorgbio.2005.06.014