title: Isolation of a methyl parathion-degrading strain Stenotrophomonas sp. SMSP-1 and cloning of the ophc2 gene.
abstract: A rod-shaped, gram-negative bacterium Stenotrophomonas sp. SMSP-1 was isolated from the sludge of a wastewater treating system of a pesticide manufacturer. Strain SMSP-1 could hydrolyze methyl parathion to p-nitrophenol (PNP) and dimethyl phosphorothioate but could not degrade PNP further. Strain SMSP-1 was able to hydrolyze other organophosphate pesticides, including fenitrothion, ethyl parathion, fenthion, and phoxim, but not chlorpyrifos. A 4395-bp DNA fragment, including an organophosphorus hydrolase encoding gene ophc2, was cloned from the chromosome of strain SMSP-1 using the shotgun technique. Its sequence analysis showed that ophc2 was associated with a typical mobile element ISPpu12 consisting of tnpA (encoding a transposase), lspA (encoding a lipoprotein signal peptidase), and orf1 (encoding a CDF family heavy metal/H(+) antiporter). The ophc2 gene was effectively expressed in E. coli. This is the second report of cloning the ophc2 gene and the first report of this gene from the genus of Stenotrophomonas.
authors.affiliation: College of Life Sciences, Nanjing Agricultural University, Nanjing, People's Republic of China.
authors.forename: Yu-jia
authors.initials: YJ
authors.lastname: Shen
authors.forename: Pen
authors.initials: P
authors.lastname: Lu
authors.forename: Huan
authors.initials: H
authors.lastname: Mei
authors.forename: Hao-jie
authors.initials: HJ
authors.lastname: Yu
authors.forename: Qing
authors.initials: Q
authors.lastname: Hong
authors.forename: Shun-peng
authors.initials: SP
authors.lastname: Li
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D001673:Biodegradation, Environmental; D003001:Cloning, Molecular; D004926:Escherichia coli; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial / Q000235:genetics*; D008743:Methyl Parathion / Q000378:metabolism*; D008969:Molecular Sequence Data; D009596:Nitrophenols / Q000378:metabolism; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D020588:Stenotrophomonas / Q000235:genetics* / Q000302:isolation & purification*
chemical_list: D001426:Bacterial Proteins; D009596:Nitrophenols; D012336:RNA, Ribosomal, 16S; D008743:Methyl Parathion; C024836:4-nitrophenol