Wang_2020_Pestic.Biochem.Physiol_170_104704

Reference

Title : Characterization of a novel hyper-thermostable and chlorpyrifos-hydrolyzing carboxylesterase EstC: A representative of the new esterase family XIX - Wang_2020_Pestic.Biochem.Physiol_170_104704
Author(s) : Wang B , Wu S , Chang X , Chen J , Ma J , Wang P , Zhu G
Ref : Pestic Biochem Physiol , 170 :104704 , 2020
Abstract :

Carboxylesterases have widely been used in a series of industrial applications, especially, the detoxification of pesticide residues. In the present study, EstC, a novel carboxylesterase from Streptomyces lividans TK24, was successfully heterogeneously expressed, purified and characterized. Phylogenetic analysis showed that EstC can be assigned as the first member of a novel family XIX. Multiple sequence alignment indicated that EstC has highly conserved structural features, including a catalytic triad formed by Ser155, Asp248 and His278, as well as a canonical Gly-His-Ser-Ala-Gly pentapeptide. Biochemical characterization indicated that EstC exhibited maximal activity at pH 9.0 (Tris-HCl buffer) and 55 degC. It also showed higher activity towards short-chain substrates, with the highest activity for p-nitrophenyl acetate (pNPA2) (K(m) = 0.31 +/- 0.02 mM, k(cat)/K(m) = 1923.35 +/- 9.62 s(-1) mM(-1)) compared to other pNP esters used in this experiment. Notably, EstC showed hyper-thermostability and good alkali stability. The activity of EstC had no significant changes when it was incubated under 55 degC for 100 h and reached half-life after incubation at 100 degC for 8 h. Beyond that, EstC also showed stability at pH ranging from 6.0 to 11.0 and about 90% residual activity still reserved after treatment at pH 8.0 or 9.0 for 26 h, especially. Furthermore, EstC had outstanding potential for bioremediation of chlorpyrifos-contaminated environment. The recombinant enzyme (0.5 U mL(-1)) could hydrolyze 79.89% chlorpyrifos (5 mg L(-1)) at 37 degC within 80 min. These properties will make EstC have a potential application value in various industrial productions and detoxification of chlorpyrifos residues.

PubMedSearch : Wang_2020_Pestic.Biochem.Physiol_170_104704
PubMedID: 32980065
Gene_locus related to this paper: strco-estli

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Citations formats

Wang B, Wu S, Chang X, Chen J, Ma J, Wang P, Zhu G (2020)
Characterization of a novel hyper-thermostable and chlorpyrifos-hydrolyzing carboxylesterase EstC: A representative of the new esterase family XIX
Pestic Biochem Physiol 170 :104704

Wang B, Wu S, Chang X, Chen J, Ma J, Wang P, Zhu G (2020)
Pestic Biochem Physiol 170 :104704