Results 201 to 210 of about 3,260 (236)
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Reductive formation of carbon monoxide from CCl4 and FREONs 11, 12, and 13 catalyzed by corrinoids.
Biochemistry, 1991In an earlier publication, we reported that corrinoids catalyze the sequential reduction of CCl4 to CHCl3, CH2Cl2, CH3Cl, and CH4 with titanium(III) citrate as electron donor [Krone, U. E., Thauer, R. K., & Hogenkamp, H. P. C.
U. Krone +3 more
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Cobalt-free Corrinoids as Vitamin B12 Antagonists
Nature, 1966Abstract The anti-vitamin B12 properties of four descobalto-corrins isolated from Chromatium cells were compared with vitamin B12-anilide, vitamin B12-monocarboxylic acid, cobinamide, and Friedrich's C′3-2-methyl-2-aminopropanol(1)-vitamin B12 (compound S-102).
John I. Toohey +3 more
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Application of difference spectra of corrinoids to their determination
Analytical Biochemistry, 1969Abstract Marked absorbance differences were observed between the monocyano and dicyano forms at 358 and 370 mμ in the case of complete corrinoids, and at 354 and 368 mμ in the case of incomplete corrinoids. Approximately equal absorbance difference coefficients were derived from the absorbance differences at the respective two wavelengths for the ...
Hideki Narahara +2 more
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Microbial degradation of corrinoids
Archives of Biochemistry and Biophysics, 1965Abstract Three yellow pigment fractions produced from vitamin B12 by Pseudomonas rubescens cultures are shown by several methods to contain cyanide and a 5,6-dimethylbenzimidazole moiety. Spectral examination shows that brief exposure of each pigment to light causes a reversible cleavage of cyanide, and that prolonged exposure causes a slow ...
W. M. Scott +3 more
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Journal of Molecular Structure: THEOCHEM, 1998
Abstract NMR-restrained molecular dynamics (MD) and simulated annealing (SA) calculations have been performed on cyanocobalamin (CNCbl, vitamin B 12 ), and three methylcobalt corrinoids, the coenzymatically active methylcobalamin (CH 3 Cbl), and two analogs of its base-off species, methylcobinamide (CH 3 Cbi + ), which lacks an axial nucleotide, and ...
Xiang Zou +2 more
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Abstract NMR-restrained molecular dynamics (MD) and simulated annealing (SA) calculations have been performed on cyanocobalamin (CNCbl, vitamin B 12 ), and three methylcobalt corrinoids, the coenzymatically active methylcobalamin (CH 3 Cbl), and two analogs of its base-off species, methylcobinamide (CH 3 Cbi + ), which lacks an axial nucleotide, and ...
Xiang Zou +2 more
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Journal of Chemical Physics, 2008
Time-dependent density functional theory (TDDFT) has been applied to the analysis of the electronic spectra of methylcobalamin (MeCbl) and its derivative in which the trans axial base was replaced by a water molecule (MeCbi[Single Bond]H(2)O). The latter
T. Andruniów +6 more
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Time-dependent density functional theory (TDDFT) has been applied to the analysis of the electronic spectra of methylcobalamin (MeCbl) and its derivative in which the trans axial base was replaced by a water molecule (MeCbi[Single Bond]H(2)O). The latter
T. Andruniów +6 more
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Development of a method for the separation of corrinoids in ovine tissues by HPLC.
Biomedical chromotography, 2005A method has been developed using a combination of high-performance liquid chromatography (HPLC) and a radioisotope dilution assay (RIDA) to routinely estimate the distribution of corrinoids (the cobalamins hydroxocobalamin, methylcobalamin and 5 ...
R. Kelly, T. Gruner, A. Sykes
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, 2009
The analysis of the electronic spectra of adenosylcobalamin (AdoCbl) and its derivative in which the trans axial base was replaced by a water molecule (AdoCbi–H2O) has been performed by means of time-dependent density functional theory (TDDFT).
T. Andruniów +6 more
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The analysis of the electronic spectra of adenosylcobalamin (AdoCbl) and its derivative in which the trans axial base was replaced by a water molecule (AdoCbi–H2O) has been performed by means of time-dependent density functional theory (TDDFT).
T. Andruniów +6 more
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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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