نتایج جستجو برای: laccase enzyme
تعداد نتایج: 243077 فیلتر نتایج به سال:
Laccases are members of the blue multi-copper oxidase family that oxidize substrate molecules by accepting electrons at a mononuclear copper centre and transferring them to a trinuclear centre. Dioxygen binds to the trinuclear centre and, following the transfer of four electrons, is reduced to two molecules of water. Crystals of the laccase from Cerrena maxima have been obtained and X-ray data ...
BACKGROUND Laccases are multi-copper oxidases that catalyze the one electron oxidation of a broad range of compounds. Laccase substrates include substituted phenols, arylamines and aromatic thiols. Such compounds are activated by the enzyme to the corresponding radicals. Owing to their broad substrate range laccases are considered to be versatile biocatalysts which are capable of oxidizing natu...
An enzymatic mild acidic hydrolysis was used to separate and purify residual lignin from alkaline peroxide mechanical pulp (APMP). Using the optimum conditions for the laccase treatment (pH 4.5, temperature 50 °C, lignin consistency of 1%, a reaction time of 60 min, and a laccase dosage of 8 μ/g), oven-dried lignin was treated with laccase and in a laccase mediator system (LMS) to explore the m...
Extracellular laccase (EC 1 .14.18.1) of the cultivated mushroom Agaricus bisporus was produced constitutively in defined or complex media. No enzyme induction was found after treatment with cycloheximide or with other potential inducers such as toluidine or xylidine. The enzyme was purified to homogeneity by ammonium sulphate precipitation, ion-exchange chromatography, gel filtration and affin...
Colletotrichum truncatum is the most common pathogen fungus associated with soybean anthracnose. Although the lignin-degrading enzyme laccase has been implicated in pathogenicity of a wide range of plant pathogenic fungi, its biological role in the Colletotrichum-soybean disease system is unknown. The extent of the infection in our country led us to examine laccase production in Argentinean Col...
Virulence is the outcome of an interaction between the host and a microbe and is characterized by a large array of opposing reactions operating at the host-pathogen interface. Cryptococcus neoformans is an important opportunistic pathogen in immunocompromised patients, including those with human immunodeficiency virus, and expresses a virulence-associated laccase which is believed to oxidize br...
Ligninolytic fungi secrete extracellular lignin-modifying enzymes (LME) that degrade plant polymers for fungal nutrition but are, because of their broad substrate specificity, also applicable the degradation many hazardous pollutants. Laccase is one most well characterized LME and involved in removal recalcitrant aromatic compounds with or without assistance laccase-mediators. The fungus Rigido...
Engineered enzyme conjugate of the small laccase enzyme from Streptomyces coelicolor and zinc finger DNA binding domain from Zif268 is demonstrated to bind double stranded DNA in a site specific manner while retaining enzymatic activity.
The application of enzymes such as laccase and xylanase for the preparation of cellulose from lignocellulosic material is an option for those industries seeking to reduce the use of chlorine-containing bleach agents, thus minimizing the environmental impact of their processes. Mixed hydrolytic and oxidative enzyme systems have been well described in the context of biopulping, and thus provide g...
Laccasc (benzenediol: oxygen oxidoreductase, EC 1.1O.3.2) has been found in some fungal strains belonging to various classes.i) The enzyme generally catalyzes the removal of hydrogen from phenolic hydroxyl groups or aromatic amino groups using molecular oxygcn as a primary electron acceptor to give radicals, which undergo free-radical additions and related reactions to give various products.2-s...
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