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      SYNTHESIS, SPECTRAL CHARACTERIZATION AND ELECTROCHEMISTRY OF VANADIUM(V) COMPLEX WITH TRYPTOPHAN

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          Abstract

          A new oxovanadium(V) complex of NH4VO3 and tryptophan (TrpH) has been synthesized in aqueous solution at pH 6.0 and characterized by elemental analysis, UV-Vis, FT-IR, ¹H-NMR and mass spectroscopic data. The complex (Na4[V3O9(Trp)]) was diamagnetic in nature as was evident from the electrón spin resonance spectroscopy (ESR) and the magnetic susceptibility measurements, in conformity with the presence of vanadium(V) in the structure. The electrochemical behaviour of Na4[V3O9(Trp)] complex was also studied on the hanging mercury drop electrode (HMDE) by using cyclic voltammetry (CV). The cyclic voltammograms of Na4[V3O9(Trp)] complex exhibit two new reduction waves at —0.38 V and —1.01 V in Britton-Robinson buffer (pH 6.0) for the potential range from 0.0 V to -1.2 V.

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          Ferrichrome in Schizosaccharomyces pombe--an iron transport and iron storage compound.

          Hubertus Haas, G Winkelmann, Markus Schrettl (2004)
          Schizosaccharomyces pombe has been assumed not to produce siderophores. Nevertheless, the genomic sequence of this fission yeast revealed the presence of siderophore biosynthetic genes for hydroxamates. Applying a bioassay based on an Aspergillus nidulans strain deficient in siderophore biosynthesis, and using reversed-phase HPLC and mass spectrometry analysis, we demonstrate that S. pombe excretes and accumulates intracellularly the hydroxamate-type siderophore ferrichrome. Under iron-limiting conditions, the cellular ferrichrome pool was present in the desferri-form, while under iron-richconditions, in the ferri-form. In contrast to S. pombe, hydroxamate-type siderophores could not be detected intwo other yeast species, Saccharomyces cerevisiae and Candida albicans.
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            Possible role of zinc in the selective degeneration of dentate hilar neurons after cerebral ischemia in the adult rat.

            N Tønder, F.F. Johansen, C.J. Frederickson … (1990)
            The fluorescent dye 6-methoxy-8-p-toluene sulfonamide quinoline (TSQ) was used to monitor the distribution of zinc in the hippocampus and fascia dentata of adult rats subjected to 20 min of cerebral ischemia. In normal brains TSQ stains only neuropil, in particular the mossy fiber layers in the dentate hilus (CA4) and CA3, but within 2 h after ischemia, TSQ-fluorescent cells were observed in the dentate hilus. At longer survival times TSQ-positive cells stained positively with acid fuchsin, a sign of cellular degeneration. At the same time a decrease in the TSQ fluorescence of the mossy fiber terminals in the dentate hilus (CA4) and the CA3 mossy fiber layer was noted. The observations suggest that zinc many play a role in the selective death of dentate hilar neurons after cerebral ischemia.
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              Iron homeostasis in the fission yeast Schizosaccharomyces pombe.

              Simon Labbé, Alexandre Mercier, Guy Pelletier (2007)
              Schizosaccharomyces pombe has acquisition processes for iron, an essential nutrient. One pathway consists to produce, excrete, and capture siderophore-iron complexes. A second pathway requires enzymatic reduction of ferric iron at the cell surface prior to uptake by a permease-oxidase complex. Genes encoding proteins involved in iron assimilation are transcriptionally regulated as a function of iron availability. Under high iron conditions, the GATA-type regulator Fep1 represses the expression of iron uptake genes. The repressor function of Fep1 requires the presence of the Tup11 or Tup12 transcriptional co-repressor. Under low iron conditions, two regulatory mechanisms occur. First, the iron transport genes are highly induced. Second, there is a transcription factor cascade implicating the heteromeric CCAAT-binding complex that turns off a set of genes encoding iron-utilizing proteins, presumably to avoid a futile expenditure of energy in producing iron-using proteins that lack the necessary cofactor to function. Thus, collectively, these regulatory responses to variations in iron concentrations ensure that iron is present within cells for essential biochemical reactions, yet prevent the accumulation of iron or iron-using proteins to deleterious levels.
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                Author and article information

                Contributors
                SEMHA ÇAKIR: Role: ND
                ENDER BÇER: Role: ND
                Journal
                Journal ID (publisher): jcchems
                Title: Journal of the Chilean Chemical Society
                Abbreviated Title: J. Chil. Chem. Soc.
                Publisher: Sociedad Chilena de Química (Concepción )
                ISSN: 0717-9707
                Publication date (Print): June 2010
                Volume: 55
                Issue: 2
                Pages: 236-239
                Affiliations
                [1 ] Gazi University Turkey
                [2 ] Ondokuz Mayis University Turkey
                Article
                Publisher ID: S0717-97072010000200020
                DOI: 10.4067/S0717-97072010000200020
                SO-VID: 7098cbb8-5755-4517-93eb-755e640c3ed3
                License:

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Chile

                Self URI (journal page): http://www.scielo.cl/scielo.php?script=sci_serial&pid=0717-9707&lng=en
                Categories
                Subject: CHEMISTRY, MULTIDISCIPLINARY

                ScienceOpen disciplines: General chemistry
                Keywords: Vanadium complexes,Tryptophan,Spectroscopy,Voltammetry
                Data availability:
                ScienceOpen disciplines: General chemistry
                Keywords: Vanadium complexes, Tryptophan, Spectroscopy, Voltammetry

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