Inhibition of Thermus thermophilus HB8 thioredoxin activity by platinum(II) |
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Authors: | Kato Masahiro Yamamoto Hitoshi Okamura Taka-aki Maoka Nobuko Masui Ryoji Kuramitsu Seiki Ueyama Norikazu |
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Affiliation: | Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. |
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Abstract: | A 1:1 thioredoxin-Pt(bpy) complex was prepared by adding [Pt(bpy)(en)]Cl(2)(bpy = 2,2'-bipyridine, en = ethylenediamine) to Thermus thermophilus HB8 thioredoxin in pH 8 phosphate buffer. Matrix-assisted laser desorption-ionization time of flight mass spectrometry (MALDI-TOF MS) and UV spectra of indicate the formation of Pt(bpy)(cys-Ala-Pro-cys-containing peptide fragment). These findings suggest that the Pt(bpy)(2+) unit binds to the active site of thioredoxin. The thioredoxin-platinum complex has no catalytic activity for the reduction of glutathione disulfide in the presence of NADPH and thioredoxin reductase, so that the platinum complex functions as an inhibitor. |
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