Vanadium (IV) Formation in the Reduction of Vanadate by Glutathione Reductase/NADPH and the Role of Molecular Oxygen

Details

• Personal Author:
  Dalal N ; Flynn DC ; Liu K ; Shi X
• Description:
  Experimental evidence documenting the formation of a relatively stable V(IV) species appears to be important with regard to the biochemical mechanism of reduction of vanadate by enzymatic systems. The present study demonstrates that a mixture of vanadate and glutathione reductase/nicotinamide-adenine-dinucleotide phosphate (NADPH), in phosphate (pH 7.2) buffer generates V(IV) under ambient conditions. Once formed, V(IV) does not rapidly autoxidize so as to defy detection by electron spin resonance (ESR) spectroscopy. The aerobic environment was guaranteed by preparing reaction mixtures in well stirred, wide mouth, standard test tubes in air over a period of 50 minutes, and by making ESR measurements in nuclear magnetic resonance (NMR) sample tubes as well as oxygen-permeable Teflon tubes. The V(IV) ESR signal intensity was found to increase linearly with time elapsed after reaction initiation. The linear growth of the V(IV) species also shows that this species is fairly stable, over a period of at least 50 minutes. Similar V(IV) stability data were obtained from VOSO4, a model compound as a source of V(IV). The results obtained in the present study demonstrated that V(IV) can be generated in the reduction of V(IV) by glutathione reductase in the presence of NADPH under aerobic condition. [Description provided by NIOSH]
• Subjects:
  Chemistry Chemistry, Analytic Energy Metabolism Occupational Health Safety
• Keywords:
  Aerobic-metabolism Analytical-chemistry Analytical-processes Metabolic-study Metabolites
• ISSN:
  0091-7370
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 3 ; West Virginia
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  HELD - Health Effects Laboratory Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  422-427
• Volume:
  27
• Issue:
  6
• NIOSHTIC Number:
  nn:20024908
• Citation:
  Ann Clin Lab Sci 1997 Nov-Dec; 27(6):422-427
• Contact Point Address:
  Xianglin Shi Ph.D. Pathology and Physiology Research Branch, Health Effects Laboratory Division, Nationat Insitute for Occupational Safety and Health, 1095 Willowdale Road, Mail Stop B167, Mirgantown, WV 26505
• Federal Fiscal Year:
  1998
• Peer Reviewed:
  True
• Source Full Name:
  Annals of Clinical and Laboratory Science
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:9965e7be9b1d8386ba147a1145e87d2ba409d000a4e2b20017a1d8e6d95e5f20be0e7154b6fedf97575062cd60eed58fe7cbec8482f45cc7792121d46976d603
• Download URL:
  https://stacks.cdc.gov/view/cdc/196488/cdc_196488_DS1.pdf
• File Type:
  [PDF - 439.49 KB ]