نتایج جستجو برای: peroxidases
تعداد نتایج: 2431 فیلتر نتایج به سال:
Peroxidases are very important enzymes, e.g., as preventive antioxidants by removing noxious peroxides from the blood. For this reason we evaluated a colorimetric method which detects the activity of endogenous peroxidases by their reaction with hydrogen peroxide, using tetramethylbenzidine as the chromogenic substrate. This assay design can be easily reversed by change of the variable compound...
A previous report from our group had shown in vitro a direct interaction between peroxidases and dietary antioxidants at physiological concentrations, where in the absence of H(2)O(2), the antioxidants could serve as oxidizing substrates for the peroxidases. However, the physiological relevance of those findings had not been evaluated. The main objective of this study was to determine whether t...
Our review includes a genomic survey of multitude reactive oxygen species (ROS) related intra- and extracellular enzymes proteins among fungi Basidiomycota, following their taxonomic classification within the systematic classes orders, focusing on different fungal lifestyles (saprobic, symbiotic, pathogenic). Intra- ROS metabolism-involved (49 protein families, summing 4170 models) were searche...
Catalase-peroxidases or KatGs from seven different organisms, including Archaeoglobus fulgidus,Bacillus stearothermophilus, Burkholderia pseudomallei, Escherichia coli, Mycobacterium tuberculosis, Rhodobacter capsulatus and Synechocystis PCC 6803, have been characterized to provide a comparative picture of their respective properties. Collectively, the enzymes exhibit similar turnover rates wit...
Enzymatic degradation of organic pollutants is a new and promising remediation approach. Peroxidases are one of the most commonly used classes of enzymes to degrade organic pollutants. However, it is generally assumed that all peroxidases behave similarly and produce similar degradation products. In this study, we conducted detailed studies of the degradation of a model aromatic pollutant, Sulf...
The gene encoding cytochrome c nitrite reductase (NrfA) from Desulfovibrio desulfuricans ATCC 27774 was sequenced and the crystal structure of the enzyme was determined to 2.3-A resolution. In comparison with homologous structures, it presents structural differences mainly located at the regions surrounding the putative substrate inlet and product outlet, and includes a well defined second calc...
Animal peroxidases are iron-containing proteins that catalyze the oxidation of a variety of substances by hydrogen peroxide. Histochemically, the myeloperoxidase of granulocytes is the most easily detected (1). Tyrosinase (dopa oxidase) is a copper-containing enzyme complex capable of converting both tyrosine to dopa (slowly) and dopa to dopa quinone (rapidly) in the melanin synthetic pathway (...
In higher plants, class III peroxidases exist as large multigene families (e.g. 73 genes in Arabidopsis thaliana). The diversity of processes catalysed by peroxidases as well as the large number of their genes suggests the possibility of a functional specialization of each isoform. In addition, the fact that peroxidase promoter sequences are very divergent and that protein sequences contain bot...
Carrot (Daucus carota L.) belongs to the group of common edible vegetables. The aim of the present study was to establish the distribution of guaiacol peroxidases in carrot root sections as well as to determine the enzymatic activity and the electrophoretic pattern of isoperoxidases in tissue extracts of particular root regions: central cylinder, inner cortex and epidermis, including the periph...
Evolution of lignocellulose decomposition was one of the most ecologically important innovations in fungi. White-rot fungi in the Agaricomycetes (mushrooms and relatives) are the most effective microorganisms in degrading both cellulose and lignin components of woody plant cell walls (PCW). However, the precise evolutionary origins of lignocellulose decomposition are poorly understood, largely ...
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