نتایج جستجو برای: cobalamin
تعداد نتایج: 1844 فیلتر نتایج به سال:
How cobalamin-dependent enzymes promote C-Co homolysis to initiate radical catalysis has been debated extensively. For the pyridoxal 5'-phosphate and cobalamin-dependent enzymes lysine 5,6-aminomutase and ornithine 4,5-aminomutase (OAM), large-scale re-orientation of the cobalamin-binding domain linked to C-Co bond breakage has been proposed. In these models, substrate binding triggers dynamic ...
The elderly have long been considered the primary target group for improved cobalamin nutrition. Cobalamin insufficiency has been associated with a variety of neurodegenerative conditions in this demographic group (1). However, there is mounting evidence that cobalamin deficiency is also associated with neurodevelopmental morbidity during infancy (2). In a simple, welldesigned, randomized doubl...
BACKGROUND Arsenic is a carcinogen to which 35 million people in Bangladesh are chronically exposed. The enzymatic transfer of methyl groups to inorganic As (iAs) generates monomethylarsonic (MMA) and dimethylarsinic acids (DMA) and facilitates urinary As (uAs) elimination. This process is dependent on one-carbon metabolism, a pathway in which folate and cobalamin have essential roles in the re...
Corrinoids are essential cofactors of reductive dehalogenases in Dehalococcoides mccartyi, an important bacterium in bioremediation, yet sequenced D. mccartyi strains do not possess the complete pathway for de novo corrinoid biosynthesis. Pelosinus sp. and Desulfovibrio sp. have been detected in dechlorinating communities enriched from contaminated groundwater without exogenous cobalamin corrin...
BACKGROUND Many previous investigations of cobalamin and folate status were performed in white populations. OBJECTIVE Our objective was to determine whether there are racial differences in the prevalence of cobalamin and folate deficiency. DESIGN The study was a cross-sectional comparison of baseline serum cobalamin, folate, methylmalonic acid (MMA), total homocysteine (tHcy), and creatinin...
A 16 kb DNA fragment has been isolated from a Bacillus megaterium genomic library and fully sequenced. The fragment contains 15 open reading frames, 14 of which are thought to constitute a B. megaterium cobalamin biosynthetic (cob) operon. Within the operon, 11 genes display similarity to previously identified Salmonella typhimurium cobalamin biosynthetic genes (cbiH60, -J, -C, -D, -ET, -L, -F,...
Vitamin B12 (cobalamin) has two active forms, adenosylcobalamin and methylcobalamin which have a key role in two important metabolic pathways in humans and their deficiency is responsible for clinical problems. Cobalamin is essential during whole life, but its sufficient amount is extra important in fetal and neonatal period, when it is essential for normal child growth and development as well ...
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