Transformation of humic acids by two-domain laccase from Streptomyces anulatus
| Autor: | A. V. Lisov, L.I. Trubitsina, Alexey A. Leontievsky, Ivan Vasilyevich Trubitsin, A. G. Zavarzina, Zoya A. Lisova |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
SASL chemistry.chemical_classification Laccase 0303 health sciences ABTS Bioengineering 01 natural sciences Applied Microbiology and Biotechnology Biochemistry Catalysis 03 medical and health sciences chemistry.chemical_compound Enzyme Polymerization chemistry 010608 biotechnology Thermal stability computer Streptomyces anulatus 030304 developmental biology computer.programming_language Nuclear chemistry |
| Zdroj: | Process Biochemistry. 76:128-135 |
| ISSN: | 1359-5113 |
| DOI: | 10.1016/j.procbio.2018.11.001 |
| Popis: | The properties of two-domain laccase of Streptomyces anulatus (SaSL) and its role in transformation of humic acids (HA) from chernozem, sod-podzolic soil and peat at alkaline pH values were studied. The SaSL was cloned, expressed in E. coli and obtained in an electrophoretically homogeneous state. SaSL is an oligomeric protein with a molecular weight of 235-300 kDa and six or eight subunits in the molecule. The molecular weight of the subunit is 37.7 kDa. Its catalytic properties are similar to those of the previously described two-domain laccase. The enzyme catalyzed oxidation of electron donors (K4[Fe(CN)6], ABTS) at acidic pH and phenolic substrates (2-methoxyphenol, 2,6-dimethixyphenol) at alkaline pH values. The efficiency of catalysis was higher in the case of electron donors than phenolic substrates. The enzyme showed a high thermal stability and was more stable at neutral and alkaline pH values. The enzyme effectively transformed humic acids at alkaline pH values. It was found that polymerization reactions took place during interaction of SaSL with HA, as well as with their high-molecular weight (>80 kDa) and low-molecular weight ( |
| Databáze: | OpenAIRE |
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