Substitution-inert metal ions as probes of biological function

doi:10.1016/S0010-8545(00)80343-4

Coordination Chemistry Reviews

Volume 25, Issue 2, March 1978, Pages 103-132

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A comparison of the coordination geometries of some 4-methylimidazole-5- carbaldehyde complexes with Zn(II), Cd(II) and Co(II) ions in the solid state and aqueous solution
2005, Polyhedron
Reactions of Zn(II), Cd(II) and Co(II) ions with 4-methylimidazole-5-carbaldehyde (4-Me-5-CHOIm) afforded four novel complexes [Zn(4-Me-5-CHOIm)₄](NO₃)₂ (1), [Cd(4-Me-5-CHOIm)₄](NO₃)₂(H₂O) (2), [Co(4-Me-5-CHOIm)₂(H₂O)₂](NO₃)₂ (3) and [Co(4-Me-5-CHOIm)₂(NO₃)₂] (4). Compounds 1–3 were characterized by X-ray diffraction, establishing tetrahedral $(I \bar{4})$ , distorted dodecahedral (C2/c) and octahedral $(P \bar{1})$ coordinating geometries of the metal ions, respectively. The crystal structure of 3 includes in the unit cell two symmetry-independent cations: [Co(1)L₂(H₂O)₂]²⁺ and [Co(2)L₂(H₂O)₂]²⁺which differ slightly in bond lengths and valence angles. In solution, NMR and potentiometric methods have confirmed the preference of the central ions not only to adopt a specific coordination number and geometry of coordination polyhedra, but also the function of the ligands which can be either monodentate (ZnN₄) or bidentate (CdN₄O₄ and CoN₂O₄).
Interaction of Tl<sup>+</sup> with mononucleotides: Metal ion binding and sugar conformation
1997, Journal of Inorganic Biochemistry
The interactions of Tl⁺ with sodium salts of cytidine-5′-monophosphate (5′-CMP), thymidine-5′- monophosphate (5′-TMP), 2-deoxyadenosine-5′-monophosphate (5′-dGMP) in ratios 1 and 2 have been studied in neutral pH. The solid complexes were isolated and characterized by Fourier transform infrared (FTIR) and ¹H-NMR spectroscopy. In the Tl₂-CMP, Tl⁺ binds indirectly (through H₂O) to N-3 and directly to the phosphate group, with sugar moiety in the C2′-endo/anti conformation. In the crystalline salt of Tl₂-TMP, major interaction of Tl⁺ with the thymine ring and phosphate group is observed. The conformation of ribose moiety in the Tl₂-TMP complex is C3′-endo/anti. The crystalline salt of Tl₂-dAMP shows indirect Tl-N-1 through the metal hydration shell (outer sphere) and direct Tl-N-7 and Tl-PO₃ (inner sphere). The conformation of ribose moiety in Tl₂-dAMP is C3′-endo/anti. The Tl₂-dGMP contains indirect metal-carbonyl (outer sphere) and direct metal-N-7 and metal-PO₃ bindings (inner sphere) with ribose moiety in the C3′-endo/anti conformation.
Coordination chemistry of hexadentate EDTA-type ligands with M(III) ions
1993, Coordination Chemistry Reviews
In recent years, many edta-type ligands have been prepared and used to form hexadentate complexes with Co(III), Cr(III), and Rh(III). Absolute configurations have been determined by X-ray crystallography for representative complexes, substantiating assignments based on circular dichroism (CD) spectra. Within the first absorption band, the CD patterns for Co(III) complexes differ in energies of CD peaks relative to the absorption maximum, depending on the combinations of acetate and propionate arms. The overall pattern suggests that different combinations of three transitions usually appear. Some enlargement of chelate rings intended to relieve strain has been found to introduce other strain. Unexpected C-N bond cleavage for Cr(III) complexes of edta-type ligands with propionate arms led to the identification of conformational isomers.
Introduction of Exchange-Inert Metal Ions into Enzymes
1988, Methods in Enzymology
This chapter discusses the introduction of exchange, which is the conversion of inert metal ions into enzymes. This chapter also discusses the principles that underlie the use of exchange-inert metals with enzymes that are first reviewed, and the types of information to be gained from such studies are briefly surveyed. This chapter also describes the procedures for the preparation of enzymes, containing exchange-inert metals that are described together with methods for the interpretations of the results. The first concern in interpreting the effects of incorporation of Co(III) or Cr(III) into an enzyme by in situ oxidation is to establish that, it is the oxidation of the metal and not the protein that is responsible for the observed changes. Thus, a second concern is that the oxidation of Co(II) to Co(Ill) or Cr(II) to Cr(III) in the metal-binding site of the enzyme has changed more than the liability of the ion. It may also change the coordination number, coordination geometry, metal charge, pK of metal-bound water, or other properties of the site.
Preparation of Metal-Hybrid Enzymes
1988, Methods in Enzymology
This chapter discusses various methods for the preparation of metal-hybrid enzymes. Three approaches exist for metal exchange: (1) preparation of an apoenzyme with subsequent insertion of a metal ion, (2) displacement of the intrinsic metal ion by another metal ion (sometimes referred to as interchange or direct exchange), and (3) growth of a micro-organism producing the metalloenzymes in a medium, in which the concentration of the native metal ion is very low and the concentration of the metal ion to be incorporated is relatively high. This biosynthetic incorporation of metal ions does not necessarily provide selectivity, since it will most probably produce a fully metal-substituted species. Only the remaining two approaches are suited for the preparation of metal-hybrid enzymes. Upon selective removal of a fraction of metal ions from metalloproteins partially metal-depleted apoenzyme arc formed. When two metal ions per protein arc are present, the latter have been designated as half-apoenzyme.
Some new complexes of Co(III) with hypoxanthine, inosine and purine nucleotides
1987, Inorganica Chimica Acta
Co(III) complexes with 5′-IMP, 5′-GMP, 5′-AMP, inosine and hypoxanthine were prepared by reaction of trans-[Co(en)₂Cl₂]Cl with the nucleotide, nucleoside and the base in water medium. The complexes were characterized by their elemental analysis, conductivity, UV, NMR and IR data. In the case of nucleotide complexes, there was total substitution of the coordinated chlorines of the starting complex and entry of two nucleotides, but in the case of the inosine and hypoxanthine derivatives only one Cl was substituted.
In all cases, bonding is inferred through the heterocyclic bases, probably through the N(7), except in the 5′-AMP derivative in which indirect bonding seems to occur.

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Substitution-inert metal ions as probes of biological function

First page preview

J. Biol. Chem.

J. Biol. Chem.

Biochem. Biophys. Res. Commun.

Biochem. Biophys. Res. Commun.

Biochem. Biophys. Res. Commun.

Biochem. Biophys. Res. Commun.

Biochem. Biophys. Acta

Inorg. Chim. Acta

Biochim. Biophys. Acta

Biochim. Biophys. Acta

FEBS Lett.

Biochem. Biophys. Res. Commun.

Biochim. Biophys. Acta

J. Biol. Chem.

J. Biol. Chem.

J. Biol. Chem.

J. Biol. Chem.

J. Biol. Chem.

J. Biol. Chem.

Arch. Biochem. Biophys.

J. Biol. Chem.

J. Biol. Chem.

J. Biol. Chem.

J. Biol. Chem.

FEBS Lett.

Bioinorg. Chem.

Bioinorg. Chem.

Bioinorg. Chem.

Biochem. Biophys. Res. Commun.

J. Biol. Chem.

Bioinorg. Chem.

J. Chromatogr.

J. Am. Chem. Soc.

Chem. Rev.

J. Am. Chem. Soc.

J. Am. Chem. Soc.

J. Am. Chem. Soc.

Biochim. Biophys. Acta

Inorg. Chem.

J. Am. Chem. Soc.

Bull. Chem. Soc. Jpn.

Biochemistry

Biochemistry

Discuss. Faraday Soc.