Zhaozhong Feng

Nanjing Agricultural University, Nan-ching, Jiangsu Sheng, China

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Publications (3)8.43 Total impact

  • Peng Lu · Qinfen Li · Hongming Liu · Zhaozhong Feng · Xin Yan · Qing Hong · Shunpeng Li
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    ABSTRACT: A bacterial strain, Cupriavidus sp. DT-1, capable of degrading chlorpyrifos and 3,5,6-trichloro-2-pyridinol (TCP) and using these compounds as sole carbon source was isolated and characterized. Investigation of the degradation pathway showed that chlorpyrifos was first hydrolyzed to TCP, successively dechlorinated to 2-pyridinol, and then subjected to the cleavage of the pyridine ring and further degradation. The mpd gene, encoding the enzyme responsible for chlorpyrifos hydrolysis to TCP, was cloned and expressed in Escherichia coli BL21. Inoculation of chlorpyrifos-contaminated soil with strain DT-1 resulted in a degradation rate of chlorpyrifos and TCP of 100% and 94.3%, respectively as compared to a rate of 28.2% and 19.9% in uninoculated soil. This finding suggests that strain DT-1 has potential for use in bioremediation of chlorpyrifos-contaminated environments.
    No preview · Article · Oct 2012 · Bioresource Technology
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    Zhaozhong Feng · Jun Zhang · Xing Huang · Jing Zhang · Minggen Chen · Shunpeng Li
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    ABSTRACT: A Gram-negative, rod-shaped, non-motile, non-spore-forming bacterium, designated strain BY-1T, was isolated from a soil sample from the city of Qiqihar in Heilongjiang Province, China. Strain BY-1T grew optimally at pH 7.0 and 30-35°C in the presence of 0.5% (w/v) NaCl. An analysis of 16S rRNA gene sequences revealed that strain BY-1T fell within the radiation of the genus Pseudomonas, as it showed highest sequence similarities to Pseudomonas luteola IAM 13000T (99.5 %) and Pseudomonas duriflava HR2T (97.3 %); the levels of sequence similarity with respect to other recognized Pseudomonas species were < 96.7 %. Strain BY-1T showed low DNA-DNA relatedness values with P. luteola IAM 13000T(29±3.1%) Pseudomonas duriflava HR2T (21±1.5 %). The G+C content of the genomic DNA of strain BY-1T was 55.3 mol%. The major fatty acids were C18:1, C16:0, and Summed features 3 (C16:1ω6c and/or C161ω7c). Major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and phosphatidylethanolamine. The major ubiquinone was Q-9. The data obtained in this polyphasic study indicated that this isolate represents a novel species of the genus Pseudomonas, for which the name Pseudomonas zeshuii sp. nov. is proposed. The type strain is BY-1T (= KACC 15471T= ACCC 05688T).
    Preview · Article · Dec 2011 · International Journal of Systematic and Evolutionary Microbiology
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    Peng Lu · Lei Jin · Bin Liang · Jing Zhang · Shunpeng Li · Zhaozhong Feng · Xing Huang
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    ABSTRACT: Ancylobacter sp. XJ-412-1, capable of degrading metsulfuron-methyl, was isolated from sulfonylurea-contaminated soil. When metsulfuron-methyl was provided as the sole carbon source, more than 90.5% of metsulfuron-methyl at concentration of 50 mg l(-1) was degraded by strain XJ-412-1 after incubation at 30°C for 7 days. The initial degradation products of metsulfuron-methyl (MSM), thifensulfuron-methyl (TSM), and bensulfuron-methyl (BSM) by XJ-412-1 were identified as corresponding deesterified derivatives by liquid chromatography-mass spectrometry, which indicated a primary pathway of the deesterification of these three sulfonylurea herbicides. The carboxyesterase activity of the cell-free extracts was assayed and strongly inhibited by 4-chloromercuribenzoic acid (PCMB), diethyl pyrocarbonate (DEPC), phenylmethylsulfonyl fluoride (PMSF), and malathion.
    Full-text · Article · Mar 2011 · Current Microbiology