P Rabindra Reddy
Articles written in Journal of Chemical Sciences
Volume 95 Issue 3 August 1985 pp 229-233 Letter
Volume 98 Issue 4 May 1987 pp 289-295 Inorganic and Analytical
The interaction of Cu(II), Ni(II), Zn(II), Co(II), Mg(II) and Ca(II) ions with cytidine and amino carboxylic acids (EDTA, NTA and IMDA) in a 1∶1∶1 ratio have been investigated by potentiometric equilibrium measurements at 35°C and 0·10 M (KNO3) ionic strength. These investigations were undertaken to assess the influence of the secondary ligands on the structure and stability of the 1∶1 metal-cytidine system. The stabilities of ternary and binary complexes are compared and stabilization factors are explained.
Volume 99 Issue 5-6 December 1987 pp 297-303 Inorganic and Analytical
Studies on interaction of La(III), Pr(III), Nd(III), Sm(III), Gd(III), Dy(III) and Er(III) with inosine and xanthosine in a 1:1 ratio have been carried out by potentiometric equilibrium measurements at 35±0·1°C and 0·1 M (KNO3) ionic strength. Investigations were also made for the interaction of these metal ions and nucleosides with the biologically important secondary ligands glycine and histidine. These investigations were undertaken with a view to assess the influence of charge on the structure and stability of 1:1 metal-inosine/xanthosine systems.
Volume 108 Issue 3 June 1996 pp 272-272 Modern Trends In Inorganic Chemistry
Volume 110 Issue 2 April 1998 pp 97-106 Inorganic And Analytical
Interaction of bivalent Co, Ni, Cu and Zn metal ions with purine nucleotides (5′-guanosine monophosphate and 5′-inosine monophosphate) and aliphatic amino acids (alanine,
Volume 112 Issue 3 June 2000 pp 358-358
Volume 112 Issue 6 December 2000 pp 593-600
The mixed ligand complexes of Cu(II), Ni(II) and Co(II) with uridine and amino acids, L-alanine, L-phenylalanine and L-tryptophan were synthesized and characterized by elemental analysis, conductivity data, infrared spectra, electronic spectra and magnetic susceptibility data. In these complexes, the nucleoside (uridine) acts as a monodentate ligand coordinating through O(4) under the conditions of investigation, whereas the amino acids coordinate through the carboxylate oxygen and the amino nitrogen. Distorted octahedral geometry for Cu(II) and octahedral geometries for both Ni(II) and Co(II) are proposed.
Volume 113 Issue 1 February 2001 pp 35-42
Zinc finger domains consist of sequences of amino acids containing cysteine and histidine residues tetrahedrally coordinated to a zinc ion. The role of zinc in a DNA binding finger was considered purely structural due to the absence of redox chemistry in zinc. However, whether other metals e.g. Co(II) or Cd(II) can substitute Zn(II) is not settled. For an answer the detailed interaction of Co(II) and Cd(II) with cysteine methylester and histidine methylester has been investigated as a model for the zinc core in zinc fingers. The study was extended to different temperatures to evaluate the thermodynamic parameters associated with these interactions. The results suggest that zinc has a unique role.
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