title: Cloning of a novel pyrethroid-hydrolyzing carboxylesterase gene from Sphingobium sp. strain JZ-1 and characterization of the gene product.
abstract: A novel esterase gene, pytH, encoding a pyrethroid-hydrolyzing carboxylesterase was cloned from Sphingobium sp. strain JZ-1. The gene contained an open reading frame of 840 bp. Sequence identity searches revealed that the deduced enzyme shared the highest similarity with many alpha/beta-hydrolase fold proteins (20 to 24% identities). PytH was expressed in Escherichia coli BL21 and purified using Ni-nitrilotriacetic acid affinity chromatography. It was a monomeric structure with a molecular mass of approximately 31 kDa and a pI of 4.85. PytH was able to transform p-nitrophenyl esters of short-chain fatty acids and a wide range of pyrethroid pesticides, and isomer selectivity was not observed. No cofactors were required for enzyme activity.
authors: Key Laboratory of Microbiological Engineering of Agricultural Environment, Ministry of Agriculture, Life Sciences College of Nanjing Agricultural University, Nanjing, Jiangsu 210095, People's Republic of China.
authors: Bao-zhan
authors: BZ
authors: Wang
authors: Peng
authors: P
authors: Guo
authors: Bao-jian
authors: BJ
authors: Hang
authors: Lian
authors: L
authors: Li
authors: Jian
authors: J
authors: He
authors: Shun-peng
authors: SP
authors: Li
mesh_terms: D043182:Carboxylesterase / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism*; D002846:Chromatography, Affinity / Q000379:methods; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D005232:Fatty Acids, Volatile / Q000378:metabolism; D007526:Isoelectric Point; D008969:Molecular Sequence Data; D008970:Molecular Weight; D016366:Open Reading Frames; D011722:Pyrethrins / Q000378:metabolism*; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D042301:Sphingomonadaceae / Q000201:enzymology* / Q000235:genetics; D013379:Substrate Specificity
chemical_list: D004269:DNA, Bacterial; D005232:Fatty Acids, Volatile; D011722:Pyrethrins; D011994:Recombinant Proteins; D043182:Carboxylesterase