An alkaline phosphatase from Bacillus amyloliquefaciens YP6 of new application in biodegradation of five broad-spectrum organophosphorus pesticides.
J Environ Sci Health B
; 54(4): 336-343, 2019.
Article
em En
| MEDLINE
| ID: mdl-30822193
ABSTRACT
In recent decades, biodegradation has been considered a promising and eco-friendly way to eliminate organophosphorus pesticides (OPs) from the environment. To enrich current biodegrading-enzyme resources, an alkaline phosphatase (AP3) from Bacillus amyloliquefaciens YP6 was characterized and utilized to test the potential for new applications in the biodegradation of five broad-spectrum OPs. Characterization of AP3 demonstrated that activity was optimal at 40 °C and pH 10.3. The activity of AP3 was enhanced by Mg2+, Ca2+, and Cu2+, and strongly inhibited by Mn2+, EDTA, and L-Cys. Compared to disodium phenyl phosphate, p-nitrophenyl phosphate (pNPP) was more suitable to AP3, and the Vm, Km, kcat, kcat/Km values of AP3 for pNPP were 4,033 U mg-1, 12.2 mmol L-1, 3.3 × 106 s-1, and 2.7 × 108 s-1mol-1L, respectively. Degradation of the five OPs, which included chlorpyrifos, dichlorvos, dipterex, phoxim, and triazophos, was 18.7%, 53.0%, 5.5%, 68.3%, and 96.3%, respectively, after treatment with AP3 for 1 h. After treatment of the OP for 8 h, AP3 activities remained more than 80%, with the exception of phoxim. It can be postulated that AP3 may have a broad OP-degradation ability and could possibly provide excellent potential for biodegradation and bioremediation in polluted ecosystems.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Praguicidas
/
Organofosfatos
/
Fosfatase Alcalina
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Bacillus amyloliquefaciens
Idioma:
En
Revista:
J Environ Sci Health B
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
China