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| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Tasiopoulos, A. J. | en |
| dc.contributor.author | Tolis, E. J. | en |
| dc.contributor.author | Tsangaris, J. M. | en |
| dc.contributor.author | Evangelou, A. | en |
| dc.contributor.author | Woollins, J. D. | en |
| dc.contributor.author | Slawin, A. M. Z. | en |
| dc.contributor.author | Pessoa, J. C. | en |
| dc.contributor.author | Correia, I. | en |
| dc.contributor.author | Kabanos, T. A. | en |
| dc.date.accessioned | 2015-11-24T16:41:57Z | - |
| dc.date.available | 2015-11-24T16:41:57Z | - |
| dc.identifier.issn | 0949-8257 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/8494 | - |
| dc.rights | Default Licence | - |
| dc.subject | vanadium | en |
| dc.subject | peptides | en |
| dc.subject | circular dichroism | en |
| dc.subject | electron paramagnetic resonance | en |
| dc.subject | sulfhydryl-containing pseudopeptides | en |
| dc.subject | synthetic analogs | en |
| dc.subject | crystal-structure | en |
| dc.subject | complexes | en |
| dc.subject | chemistry | en |
| dc.subject | peptides | en |
| dc.subject | nitrogenase | en |
| dc.subject | binding | en |
| dc.subject | ligands | en |
| dc.subject | epr | en |
| dc.title | Model investigations for vanadium-protein interactions: vanadium(III) compounds with dipeptides and their oxovanadium(IV) analogues | en |
| heal.type | journalArticle | - |
| heal.type.en | Journal article | en |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.identifier.primary | DOI 10.1007/s00775-001-0308-0 | - |
| heal.identifier.secondary | <Go to ISI>://000174957800002 | - |
| heal.identifier.secondary | http://www.springerlink.com/content/te6xektmf6hyg4j8/fulltext.pdf | - |
| heal.language | en | - |
| heal.access | campus | - |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας | el |
| heal.publicationDate | 2002 | - |
| heal.abstract | The reaction of VCl3 with 1,10-phenanthroline and a series of dipeptides (H(2)dip), having aliphatic as well as aromatic side chains, in methyl alcohol and in the presence of triethylamine affords vanadium(III) compounds of the general formula [V-III(dip)(MeOH) (phen)]Cl. Aerial oxidation/hydrolysis of the vanadium(III) species gives their oxovanadium(IV) analogues of the general formula [(VO)-O-IV(dip)(phen)] X-ray crystallographic characterization of the [(VO)-O-IV(dip)(phen)] compounds (where dip(2-) = Gly-L-Ala, Gly-L-Val and Gly-L-Phe) revealed that the vanadium atom possesses a severely distorted octahedral coordination and is ligated to a tridentate dip(2-) ligand at the N-amine atom, the deprotonated N-peptide atom and one of the O-carboxylate atoms, as well as an oxo group and two phenanthroline nitrogen atoms. Circular dichroism characterization of the V-III/(VO2+)-O-IV-dipeptide compounds revealed a strong signal for the (VO2+)-O-IV species in the visible range of the spectrum, with a characteristic pattern which may be exploited to identify the N-am, N-pep and O-car ligation of a peptide or a protein to (VO2+)-O-IV center, and a weak Cotton effect of opposite sign to their vanadium(III) analogues. The visible spectra of the V-III-dipeptide compounds revealed two d-d bands with high intensity, thus indicating that the covalency of the metal-donor atoms is significant, i.e. the vanadium d orbitals are significantly mixed with the ligand orbitals, and this is confirmed by the low values of their Racah B parameters. The high-intensity band of the (VO2+)-O-IV-dipeptide compounds at similar to460 nm implies also a strong covalency of the metal with the equatorial donor atoms and this was supported by the EPR spectra of these compounds. Moreover, the V-III/(VO2+)-O-IV-dipeptide complexes were characterized by EPR and IR spectroscopies as well as conductivity and magnetic susceptibility measurements. | en |
| heal.publisher | Springer Verlag (Germany) | en |
| heal.journalName | Journal of Biological Inorganic Chemistry | en |
| heal.journalType | peer reviewed | - |
| heal.fullTextAvailability | TRUE | - |
| Appears in Collections: | Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά). ΧΗΜ | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Tasiopoulos-2002-Model investigations.pdf | 226.38 kB | Adobe PDF | View/Open Request a copy |
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