近日,西南大學(xué)于士將老師,使用IPHASE品牌產(chǎn)品:小鼠肝微粒體在《Journal of Hazardous Materials》全威期刊上發(fā)表文章《A down-regulated cytochrome P450 in Neoseiulus barkeri Hughes (Acari: Phytoseiidae) can dechlorinate and hydroxylate chlorpyrifos without producing chlorpyrifos-oxon》,影響因子12.2!
在有害昆蟲生物防治中農(nóng)業(yè)系統(tǒng)中存在的天敵資源發(fā)揮著重要作用,常見的有機(jī)磷類殺蟲劑如毒死蜱等在農(nóng)田噴灑作業(yè)時,對天敵的生存造成了負(fù)面影響,選育抗藥性天敵品系有助于生物防治和化學(xué)防治工作的協(xié)同開展。此前西南大學(xué)實驗室選育了一種捕食性天敵-巴氏新小綏螨毒死蜱中抗品系,在本研究中發(fā)現(xiàn)其抗性形成可能與P450解毒酶對毒死蜱代謝能力的改變有關(guān)。通過桿狀病毒蛋白表達(dá)系統(tǒng),獲得了巴氏新小綏螨三種P450微粒體蛋白,其活性與陽性對照鼠肝微粒體P450活性類似,CO差光譜顯示在450nm處具有吸收峰,利用NADPH再生系統(tǒng),建立了三種P450微粒體蛋白對毒死蜱體外代謝的反應(yīng)體系,HPLC結(jié)合MS/MS分析發(fā)現(xiàn),一個在抗性品系中下調(diào)表達(dá)的P450可以將毒死蜱吡啶環(huán)5號位的氯離子脫去并羥基化,而該蛋白下調(diào)表達(dá)產(chǎn)生抗性的原因我們推測其代謝產(chǎn)物為毒死蜱的毒性激活物,減少該成分產(chǎn)生有助于減緩其對作用靶標(biāo)的蛋白活性抑制。
摘要
Selection of chemical-resistant predatory mites is a good alternative to balance the contradiction between chemical control and biological control. Previously, a resistant strain of Neoseiulus barkeri for chlorpyrifos was obtained. In the current study, two up-regulated (NbCYP3A6, NbCYP3A16) and one down-regulated (NbCYP3A24) P450s were screened through differential expression analysis and other detoxification-related genes such as CCEs, GST, etc. were not found. 3D modelling and molecular docking indicated that the chlorine at position 5 on the pyridine ring of chlorpyrifos, as well as a methyl group, were closest to the heme iron of the enzymes (less than 5 Å). Three active recombinant P450 proteins were heterologously expressed and metabolized with chlorpyrifos in vitro. HPLC assay showed that only NbCYP3A24 could metabolize chlorpyrifos, with a metabolism rate of 21.60 %. Analysis of the m/z of metabolites by LC-MS/MS showed that chlorine at the 5C position of chlorpyrifos was stripped and hydroxylated, whereas chlorpyrifos-oxon, a common product of oxidation by P450, was not found. Knockdown of the NbCYP3A24 gene in the susceptiblestrain did reduce the.
完整版文獻(xiàn)可在【IPHASE】公眾號后臺留言【獲取文章】
再次恭喜文獻(xiàn)發(fā)表,以及對我司產(chǎn)品的認(rèn)可,希望以上文獻(xiàn)能幫助大家了解目前研究進(jìn)展及我們的核心技術(shù),歡迎各位新老客戶聯(lián)系我們咨詢、提出意見,愿我們的努力成果與您的科研碰撞出不一樣的火花!
發(fā) 文 章 得 獎 勵
凡使用本公司產(chǎn)品,在國內(nèi)及國際刊物上發(fā)表論文(論文發(fā)表日起一年內(nèi)),并注明產(chǎn)品屬于IPHASE BIOSCIENCES Co.,Ltd. / 匯智和源生物技術(shù)(蘇州)有限公司所有,即可申請獎勵。根據(jù)發(fā)表刊物影響因子不同,給予不同金額獎品:
非SCI論文及IF≤5分,500元禮品;
5分
8分
IF≥10分 2000元禮品;
注:①禮品卡也可兌換同等金額產(chǎn)品購買抵用券;
?、谌缬鑫宜竟久Q書寫不規(guī)范或不是第一作者
等情況,對應(yīng)給予獎品金額將發(fā)放50%;
活動多多,禮品豐厚,快來參與吧!
關(guān) 于 我 們
匯智和源,致力于為創(chuàng)新藥研發(fā)企業(yè)及生命科學(xué)研究機(jī)構(gòu)提供高品質(zhì)的生物試劑,IPHASE為公司核心品牌,品牌宗旨“Innovative Reagents For Innovative Research”。