Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1948599 | Biochimica et Biophysica Acta (BBA) - General Subjects | 2007 | 7 Pages |
Abstract
To better understand the mechanism of vanadium reduction in ascidians, we examined the reduction of vanadium(V) to vanadium(IV) by NADPH and the reduction of vanadium(IV) to vanadium(III) by l-cysteine methyl ester (CysME). UV-vis and electron paramagnetic resonance spectroscopic studies indicated that in the presence of several biologically relevant ligands vanadium(V) and vanadium(IV) were reduced by NADPH and CysME, respectively. Specifically, NADPH directly reduced vanadium(V) to vanadium(IV) with the assistance of ligands that have a formation constant with vanadium(IV) of greater than 7. Also, glycylhistidine and glycylaspartic acid were found to assist the reduction of vanadium(IV) to vanadium(III) by CysME.
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Authors
Mohammad K. Islam, Chieko Tsuboya, Hiroko Kusaka, Sen-ichi Aizawa, Tatsuya Ueki, Hitoshi Michibata, Kan Kanamori,