Results 141 to 150 of about 1,686 (162)
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Cobalamin- and Corrinoid-Dependent Enzymes
2009This chapter reviews the literature on cobalamin- and corrinoid-containing enzymes. These enzymes fall into two broad classes, those using methylcobalamin or related methylcorrinoids as prosthetic groups and catalyzing methyl transfer reactions, and those using adenosylcobalamin as the prosthetic group and catalyzing the generation of substrate ...
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Corrinoid catalysis of thiol oxidation
Inorganica Chimica Acta, 1983Abstract Under appropriate conditions, thiols can react with corrinoids to form relatively stable complexes [1–7], or reduced corrinoids [1, 2, 8–11]. If alkyl halides are present during the reduction of corrinoids by thiols, alkyl corrinoids are produced [4, 9, 12, 13].
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Journal of the American Chemical Society, 1993
Coenzyme B 12 analogs α-neopentylcobinamide (α-NpCbi + ) and α-neopentylcobalamin (α-NpCbl), where the bulky organic ligand is in the «lower» (α) axial ligand position, have been synthesized by reductive alkylation of cyanoaquocobinamide and aquocobalamin, respectively, with neopentyl bromide at ∼0 o C, and characterized by their UV-visible spectra ...
Kenneth L. Brown, Xiang Zou
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Coenzyme B 12 analogs α-neopentylcobinamide (α-NpCbi + ) and α-neopentylcobalamin (α-NpCbl), where the bulky organic ligand is in the «lower» (α) axial ligand position, have been synthesized by reductive alkylation of cyanoaquocobinamide and aquocobalamin, respectively, with neopentyl bromide at ∼0 o C, and characterized by their UV-visible spectra ...
Kenneth L. Brown, Xiang Zou
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A cobalt-free corrinoid compound in Streptomyces olivaceus
Biochemical and Biophysical Research Communications, 1970Abstract An unknown orange-red pigment was obtained from the cells of Streptomyces olivaceus 605 grown on a cobalt-free medium. This compound showed similar behaviors to those of the cobalt-free corrinoids of Chromatium isolated by Toohey in UV, CD and fluorescence spectra.
Shoichi Shimizu +2 more
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Archives of Microbiology, 1990
The hypothesis of common epitopes in corrinoid-dependent enzymes was tested by a monospecific polyclonal antiserum against the 33 kDa corrinoid-containing membrane protein from Methanobacterium thermoautotrophicum Marburg. Cross-reaction was detected with the 33 kDa and the 31 kDa subunits of the corrinoid-containing enriched 5-methyl-H4MPT: 5 ...
Stupperich, Erhard +3 more
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The hypothesis of common epitopes in corrinoid-dependent enzymes was tested by a monospecific polyclonal antiserum against the 33 kDa corrinoid-containing membrane protein from Methanobacterium thermoautotrophicum Marburg. Cross-reaction was detected with the 33 kDa and the 31 kDa subunits of the corrinoid-containing enriched 5-methyl-H4MPT: 5 ...
Stupperich, Erhard +3 more
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Validation of semiempirical methods for modeling of corrinoid systems
Journal of Inorganic Biochemistry, 2004Several semiempirical methods (MNDO-d, PM3tm, PM3-d, PM5, PM6, and AM1-d) have been tested against experimental data and density functional theory (DFT) results in search for the best methods that can be used for quantum-mechanical-molecular mechanics (QM/MM) modeling of corrinoid systems of vitamin B(12) co-factor.
Renata A. Kwiecień +3 more
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Guanylcobamide and hypoxanthylcobamide-Corrinoids formed by Desulfovibrio vulgaris
Archives of Microbiology, 1994The corrinoids synthesized by the sulfate-reducing bacterium Desulfovibrio vulgaris were analyzed. The compounds found were guanylcobamide and hypoxanthylcobamide; structures were determined by mass spectrometry, 1H-NMR, and ultraviolet/visible spectroscopy. D.
Paul Renz +4 more
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Complex Samples Cyanide Detection with Immobilized Corrinoids
ACS Applied Materials & Interfaces, 2012Colorimetric solid phase with spatially separated extraction and detection zones as a rapid, effective and economic method for the optical detection of cyanide in complex samples is described. The system is seven times more sensitive for the optical detection of cyanide than the same class of chemical sensors used under homogeneous conditions.
Christine Männel-Croisé, Felix Zelder
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[Multiple functions of corrinoids in prokaryote biology].
Prikladnaia biokhimiia i mikrobiologiia, 2003Data on more than 30 metabolic processes and biochemical reactions, involving corrinoids, which have been described in prokaryotes thus far, are reviewed. These pathways (central or specific, catabolic or anabolic) are inherent in bacteria and archebacteria of diverse phylogenetic lineages, comprising several physiological groups.
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Metal complexes of corroles and other corrinoids
2007Several tetrapyrroles are employed by Nature to carry out fundamental biological functions and synthetic models compounds have been extensively used in order to understand the mechanisms of action of natural systems.
Silvia Licoccia, Roberto Paolesse
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