Results 211 to 220 of about 5,305 (249)
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Quantification of corrinoids in methanogenic bacteria
Current Microbiology, 1980Corrinoids in several diverse species of methanogens were quantified by a bioassay utilizingEscherichia coli 113-3, a corrinoid auxotroph. All five species examined contained >0.65 nmol corrinoid/mg dry cells when grown on H2/CO2 as carbon and energy source.
J, Krzycki, J G, Zeikus
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Quenching corrinoid-based interactions in a model bacterial coculture
bioRxivMicrobial community structure is driven, in part, by the metabolic interdependencies of resident microbes. Thus, manipulating specific metabolic interactions represents one attractive way to both understand how microbial communities perform complex ...
Zachary F. Hallberg +3 more
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Corrinoid and thiol dependent threonine decarboxylation
Biochemical and Biophysical Research Communications, 1976Summary A novel system for the decarboxylation of L-threonine requiring the presence of certain aquocorrinoids, preferably diaquocobyric acid, and of a thiol is described. The reaction shows a marked optimum at a pH value of about 8. Other L-amino acids, with the exception of L-serine, are much less reactive. Optical data point to a ligand attachment
S H, Ford, H C, Friedmann
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Analysis of corrinoids in ovine tissues
Biomedical Chromatography, 2005AbstractCorrinoids from various ovine tissue samples (liver, blood, small intestinal fluid and faeces) were analysed using a combination of high‐performance liquid chromatography (HPLC) and a radioisotope dilution assay (RIDA) to estimate the distribution of corrinoids—the cobalamins hydroxocobalamin (OH‐cbl), methylcobalamin (me‐cbl) and 5 ...
Kelly, R J +3 more
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The FASEB Journal, 2019
Key interactions between proteins and small molecules regulate numerous environmental reactions. Such is the case with reductive dehalogenases that dechlorinate toxic chlorinated solvents only in the presence of corrinoid small molecules.
Nannan Jiang, Jun Yan, F. Löffler
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Key interactions between proteins and small molecules regulate numerous environmental reactions. Such is the case with reductive dehalogenases that dechlorinate toxic chlorinated solvents only in the presence of corrinoid small molecules.
Nannan Jiang, Jun Yan, F. Löffler
semanticscholar +1 more source
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).
D, Perlman, J I, Toohey
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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 ...
Kenneth L Brown +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 ...
Kenneth L Brown +2 more
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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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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 +1 more
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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 ...
Xiang Zou, Kenneth L. Brown
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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 ...
Xiang Zou, Kenneth L. Brown
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