نتایج جستجو برای: biotin

تعداد نتایج: 7604  

Journal: :The Journal of nutritional biochemistry 2012
Elena Larrieta Maria Luisa Lazo de la Vega-Monroy Paz Vital Asdrubal Aguilera Michael S German Mohammed El Hafidi Cristina Fernandez-Mejia

Several studies have revealed that physiological concentrations of biotin are required for the normal expression of critical carbohydrate metabolism genes and for glucose homeostasis. However, the different experimental models used in these studies make it difficult to integrate the effects of biotin deficiency on glucose metabolism. To further investigate the effects of biotin deficiency on gl...

Journal: :Analytical chemistry 2015
Chunming Liu Da Huang Tinglu Yang Paul S Cremer

Herein, we developed a new separation-based detection method that is capable of simultaneously identifying multiple competitively binding proteins for the same ligand on supported lipid bilayers (SLBs). This strategy used unlabeled target analyte proteins that bind to fluorescently tagged, lipid-conjugated ligands within the SLB. The protein-ligand binding complexes were then focused under an a...

Journal: :Plant physiology 1990
J Shellhammer D Meinke

The bio1 auxotroph of Arabidopsis thaliana is a recessive embryonic lethal that forms normal plants in the presence of biotin. The purpose of this study was to determine whether aborted seeds produced by heterozygous plants grown without vitamin supplements contained reduced levels of biotin. Two methods were used to determine the biotin content of mutant and wild-type tissues: streptavidin bin...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1972
A Campbell A Del Campillo-Campbell R Chang

A recessive mutation (bir) of E. coli, at 77 min on the standard map, destroys ability of the bacteria to take up biotin or to grow except at high concentrations of biotin. In a biotin prototroph, the bir mutation causes overproduction and excretion of biotin, and derepression of at least one biosynthetic gene (bioD). Growth of the bir mutant is inhibited by avidin or high concentrations of det...

Journal: :Applied and environmental microbiology 2005
Hong Wu Kiyoshi Ito Hitoshi Shimoi

Yeast Saccharomyces cerevisiae cells generally cannot synthesize biotin, a vitamin required for many carboxylation reactions. Although sake yeasts, which are used for Japanese sake brewing, are classified as S. cerevisiae, they do not require biotin for their growth. In this study, we identified a novel open reading frame (ORF) in the genome of one strain of sake yeast that we speculated to be ...

Journal: :The Journal of nutrition 2015
Anna Bogusiewicz Gunnar Boysen Donald M Mock

BACKGROUND A large number of birth defects are related to nutrient deficiencies; concern that biotin deficiency is teratogenic in humans is reasonable. Surprisingly, studies indicate that increased urinary 3-hydroxyisovalerylcarnitine (3HIAc), a previously validated marker of biotin deficiency, is not a valid biomarker in pregnancy. OBJECTIVE In this study we hypothesized that coexisting carn...

Journal: :Journal of bacteriology 2013
Friedrich Finkenwirth Franziska Kirsch Thomas Eitinger

Energy-coupling factor (ECF) transporters form a large group of vitamin uptake systems in prokaryotes. They are composed of highly diverse, substrate-specific, transmembrane proteins (S units), a ubiquitous transmembrane protein (T unit), and homo- or hetero-oligomeric ABC ATPases. Biotin transporters represent a special case of ECF-type systems. The majority of the biotin-specific S units (Bio...

Journal: :Clinical science 1980
K Bartlett T Horsburgh D Gompertz

1. A newly developed biotin assay was used to monitor plasma and urinary biotin concentration after the oral administration of biotin. 2. In two normal subjects, leucocyte propionyl-CoA carboxylase and beta-methylcrotonyl-CoA carboxylase were markedly stimulated after the administration of biotin.

Journal: :The Journal of biological chemistry 2011
Maria Ingaramo Dorothy Beckett

Biotin protein ligases catalyze specific covalent linkage of the coenzyme biotin to biotin-dependent carboxylases. The reaction proceeds in two steps, including synthesis of an adenylated intermediate followed by biotin transfer to the carboxylase substrate. In this work specificity in the transfer reaction was investigated using single turnover stopped-flow and quench-flow assays. Cognate and ...

Journal: :Acta crystallographica. Section D, Biological crystallography 2006
Isolde Le Trong Dimitri G L Aubert Neil R Thomas Ronald E Stenkamp

(+)-Epi-biotin differs from (+)-biotin in the configuration of the chiral center at atom C2. This could lead to a difference in the mode of binding of (+)-epi-biotin to streptavidin, a natural protein receptor for (+)-biotin. Diffraction data were collected to a maximum of 0.85 Angstrom resolution for structural analysis of the complex of streptavidin with a sample of (+)-epi-biotin and refinem...

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