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• W1977406952 endingPage "294" @default.
• W1977406952 startingPage "284" @default.
• W1977406952 abstract "The pulsed EPR technique of electron spin echo envelope modulation (ESEEM) has been utilized to examined both the 'very rapid' and 'desulfo inhibited' Mo(V) signals of xanthine oxidase in order to probe for magnetic interactions with nitrogen, phosphorus and hydrogen nuclei. No 14N modulation is observed in the 'desulfo inhibited' EPR signal, indicating that histidine is unlikely to be a ligand to molybdenum. Strong 14N modulation is observed in the 'very rapid' EPR signal formed with 2-hydroxy-6-methylpurine substrate bound to molybdenum. We interpret this modulation as arising from nitrogens of the bound purine substrate. This interpretation is consistent with the present evidence indicating that the purine ring present in the species giving rise to the 'very rapid' EPR signal is coordinated to the molybdenum center through the catalytically introduced hydroxyl group. No modulation is observed from non-exchangeable deuterons in experiments performed with deuterated 2-hydroxy-6-methylpurine. Given the signal-to-noise level of the spectra, the lack of modulation indicates that each of the substrate methyl group deuterons is greater than 4.9 A from the Mo(V). The deuteron removed from the C8 position in the binding of the substrate is also exchanged to a site or sites greater than 4.9 A from the Mo(V) in the time-course of sample preparation. Moderately deep deuteron modulation arises from exchangeable sites. A large portion of this modulation can be accounted for by the exchangeable N7 deuteron of the 2-hydroxy-6-methylpurine substrate, which we estimate to be approximately 3.2 A from the molybdenum. Additional exchangeable deuterons on the protein or within the buffer must be present within 5 A of the molybdenum to account for the remaining modulation. No modulation from weakly-coupled 31P nuclei is observed in either the 'desulfo inhibited' or 'very rapid' EPR signal." @default.
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• W1977406952 date "1994-05-01" @default.
• W1977406952 modified "2023-09-24" @default.
• W1977406952 title "Electron spin echo envelope modulation spectroscopy of the molybdenum center of xanthine oxidase" @default.
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• W1977406952 doi "https://doi.org/10.1016/0005-2728(94)90243-7" @default.
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