title: Microbial Degradation Mechanism and Pathway of the Novel Insecticide Paichongding by a Newly Isolated Sphingobacterium sp. P1-3 from Soil.
abstract: Using 1-((6-chloropydidin-3-yl)methyl)-7-methyl-8-nitro-5propoxy-1,2,3,5,6,7-hexahydroimidazo[1,2-α-]-pyridine (IPP) as the sole carbon source, we isolated a strain with a higher activity of IPP-degrading bacterium Sphingobacterium sp. P1-3 from soil. At 30 °C, pH 7.0 ,and 10 mg L(-1) IPP content, the degradation rate of IPP by Sphingobacterium sp. P1-3 could reach 57.75 and 62.47% in 20 and 30 days, respectively. The value of DT50 of IPP was 27 d at the level of 30 mg L(-1) IPP, while DT50 in the blank test was 151 d. During the IPP biodegradation process, five intermediates (M1-M5) were monitored and identified. On the basis of the identified metabolites and their biodegradation courses, a possible biodegradation pathway was proposed. IPP biodegradation mainly occurred on the tetrahydropyridine ring. IPP was transformed to five different metabolites by strain P1-3 through the oxidation and elimination of methyl, propyl, and nitro groups. Moreover, a new pathway involving M2 (1-((6-chloropydidin-3-yl)methyl)-7-methyl-8-hydroxy-5-propoxy-1,2,3,5,6,7-hexahydroimidazo [1,2-α-]-pyridine), M3 (1-((6-chloropydidin-3-yl)methyl)-7-methyl-5-carbonyl-1,2,3,5,6,7-hexahydroimidazo[1,2-α-]-pyridine), and M5 (8-amino-1,2,3,5,6,7-hexahydroimidazo[1,2-α-]-pyridine) was first monitored and identified.
authors: Zhiqiang
authors: Z
authors: Cai
authors: Wenjie
authors: W
authors: Zhang
authors: Shanshan
authors: S
authors: Li
authors: Jiangtao
authors: J
authors: Ma
authors: Jing
authors: J
authors: Wang
authors: Xiyue
authors: X
authors: Zhao
mesh_terms: D053961:Azabicyclo Compounds / Q000737:chemistry / Q000378:metabolism*; D001673:Biodegradation, Environmental; D007306:Insecticides / Q000737:chemistry / Q000378:metabolism*; D015394:Molecular Structure; D011725:Pyridines / Q000737:chemistry / Q000378:metabolism*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000737:chemistry / Q000378:metabolism; D045249:Sphingobacterium / Q000145:classification / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*
chemical_list: D053961:Azabicyclo Compounds; D007306:Insecticides; D011725:Pyridines; D012989:Soil Pollutants; C588015:paichongding
keywords: Paichongding; Sphingobacterium; biodegradation pathway; degradation intermediate; insecticide