Results 151 to 160 of about 2,324 (198)

His84rather than His35is the active site histidine in the corrinoid protein MtrA of the energy conserving methyltransferase complex fromMethanobacterium thermoautotrophicum [PDF]

FEBS Letters, 1998
The energy conserving corrinoid containing MtrA-H complex from Methanobacterium thermoautotrophicum is composed of eight different subunits of which MtrA harbors the corrinoid prosthetic group, the corrinoid being bound in the base-off/His-on ...
Karin Sauer, Rudolf Kurt Thauer
exaly   +3 more sources

Identification of a cysteine involved in the interaction between carbon monoxide dehydrogenase and corrinoid/Fe-S protein fromClostridium thermoaceticum [PDF]

FEBS Letters, 1993
In Clostridium thermoaceticum, the synthesis of acetyl-CoA from methyl tetrahydrofolate occurs via a series of enzymatic reactions involving methyl transferase, corrinoid/Fe-S protein (corrinoid), carbon monoxide dehydrogenase (CODH) and ferredoxin.
Ganesh K Kumar
exaly   +2 more sources

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A method for the efficient adenosylation of corrinoids

2022
Adenosylcobamides (AdoCbas) are coenzymes required by organisms from all domains of life to perform challenging chemical reactions. AdoCbas are characterized by a cobalt-containing tetrapyrrole ring, where an adenosyl group is covalently attached to the cobalt ion via a unique Co-C organometallic bond.
Flavia G, Costa, Elizabeth A, Villa, Jorge C, Escalante-Semerena   +2 more
openaire   +2 more sources

Quantification of corrinoids in methanogenic bacteria

Current Microbiology, 1980
Corrinoids 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
openaire   +2 more sources

Analysis of corrinoids in ovine tissues

Biomedical Chromatography, 2005
AbstractCorrinoids 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, Gruner, Tini M, Furlong, J M, Sykes, A R   +3 more
openaire   +3 more sources

Metagenomic and Metatranscriptomic Analyses Reveal the Structure and Dynamics of a Dechlorinating Community Containing Dehalococcoides mccartyi and Corrinoid-Providing Microorganisms under Cobalamin-Limited Conditions [PDF]

Applied and Environmental Microbiology, 2017
The aim of this study is to obtain a systems-level understanding of the interactions between Dehalococcoides and corrinoid-supplying microorganisms by analyzing community structures and functional compositions, activities, and dynamics in trichloroethene
Ke Yu, Susannah Tringë, Yujie Men
exaly   +2 more sources

The inorganic chemistry of the cobalt corrinoids – an update

Journal of Inorganic Biochemistry, 2023
The inorganic chemistry of the cobalt corrinoids, derivatives of vitamin B12, is reviewed, with particular emphasis on equilibrium constants for, and kinetics of, their axial ligand substitution reactions. The role the corrin ligand plays in controlling and modifying the properties of the metal ion is emphasised. Other aspects of the chemistry of these
openaire   +2 more sources

Cobalt and Corrinoid Transport and Biochemistry

2012
In this chapter, we focus on the biochemistry of non-corrin cobalt and on a subset of corrinoid-containing enzymes. We review the import of cobalt in prokaryotes and discuss two members of the non-corrin cobalt-dependent enzymes, nitrile hydratase and methionine aminopeptidase.
Valentin, Cracan, Ruma, Banerjee
openaire   +2 more sources

Application of difference spectra of corrinoids to their determination

Analytical Biochemistry, 1969
Abstract 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 ...
T, Shimizu, H, Narahara, T, Kamikubo
openaire   +2 more sources

Corrinoid and thiol dependent threonine decarboxylation

Biochemical and Biophysical Research Communications, 1976
Summary 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
openaire   +2 more sources