Expression in vitro of Metarhizium anisopliae Adhesin MAD1 and Its Effect on Inducing Response in Peanut
YAN DuoZi,, CAI Ni, WANG Feng, NONG XiangQun,, WANG GuangJun, TU XiongBing, ZHANG ZeHuaState Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193
Abstract 【Objective】The fungus Metarhizium anisopliae has the characteristics of insect pathogenicity and plant symbiosis, and its adhesin MAD1 plays an important role in the infection to host insects. The objective of this study is to express MAD1 protein in eukaryotes in vitro, and to clarify the role of MAD1 in symbiosis between M. anisopliae and plants. 【Method】Unigenes of M. anisopliae transcriptome were used as the reference sequence to search and compare the homology in GenBank and design primers. The gene mad1 was cloned from the cDNA template of M. anisopliae IPPM010202. MAD1 protein sequence was translated by DNAMAN software. The online software ProtParam was used to predict the MAD1 protein composition of amino acid and its physicochemical characteristics. The protein structure was analyzed using SMART online program. The recombinant was constructed from eukaryotic expression vector with mad1 and Pichia pastoris transformation. The MAD1 protein was successfully expressed by methanol induction and the purified MAD1 was obtained by Ni-NTA affinity chromatography. The peanut roots were treated with immersion in the purified MAD1 solution (20 μg·mL-1) for 0.5, 6, 12 and 24 h, and then the transcription levels of membrane receptor genes (CERK1, RPK), immune-related cascade related genes (MAPK, MMK1, CDPK) and transcription factor gene (MYB86), cell wall integrator gene (SCW1) as well as defense related genes (PTi1, RML1A) were detected by real-time fluorescence quantitative PCR (qPCR). 【Result】 The adhesive gene mad1 of M. anisopliae was cloned, with a total length of 2 136 bp, encoding 711 amino acids in molecular weight 74.8 kD. Bioinformatics analysis showed that the N-terminal of MAD1 has signal peptide, the C-terminal has a glycosylphosphatidyl inositol (GPI) anchor and contains CFEM functional domain and belongs to hydrophilic protein. The eukaryotic expression system with mad1 was successfully constructed and the active MAD1 protein was efficiently induced, expressed and purified. The results based on qPCR of peanut roots treated with purified MAD1 showed that, for 0.5 h, the root tip cells perceived the protein and activated the expression of membrane recognition receptor gene CERK1. In 0.5-6 h, the transcriptional levels of CERK1 and RPK were up-regulated, the transcription level of membrane-integrated gene SCW1 changed from down-regulation to up-regulation, while the transcriptional levels of MAPK, MMK1, CDPK and MYB86 were temporarily inhibited, and the transcriptional levels of defense genes PTi1 and RML1A were down-regulated, the root immune defense response was inhibited. In 6-12 h, the membrane recognition receptors maintained up-regulation, while the defensive gene RML1A reversed from down-regulation to strong up-regulation. In 12-24 h, CERK1 and RPK, PTi1 and RML1A were all up-regulated, MAPK, MMK1, CDPK and MYB86 appeared slightly up-regulated, the roots initiated immune defense response.【Conclusion】In the early stage of the interaction between M. anisopliae and peanut roots, the adhesin MAD1 protein activates the membrane receptor genes CERK1 and RPK recognition response in peanut at 6 h, while inhibits the expression of peanut immune cascade genes MAPK, CDPK, MMK1 and defense related genes such as PTi1 and RML1A, which is helpful for the colonization of M. anisopliae in peanut root tissue. Subsequently, it induces the up-regulation of expression of cell wall integrin gene SCW1, which participates in the repair and reconstruction of damaged cell wall on the root, and promotes the establishment of symbiotic relationship between M. anisopliae and peanut. Induction of plant immunosuppression and integral cell wall reconstruction may be important steps in the establishment of symbiotic relationship between M. anisopliae and plants. Keywords:MAD1;Metarhizium anisopliae;symbiosis;plant immunity;defense;eukaryotic expression
PDF (1016KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 闫多子, 蔡霓, 王峰, 农向群, 王广君, 涂雄兵, 张泽华. 绿僵菌黏附素MAD1体外表达及诱导花生响应的作用[J]. 中国农业科学, 2021, 54(4): 744-753 doi:10.3864/j.issn.0578-1752.2021.04.007 YAN DuoZi, CAI Ni, WANG Feng, NONG XiangQun, WANG GuangJun, TU XiongBing, ZHANG ZeHua. Expression in vitro of Metarhizium anisopliae Adhesin MAD1 and Its Effect on Inducing Response in Peanut[J]. Scientia Acricultura Sinica, 2021, 54(4): 744-753 doi:10.3864/j.issn.0578-1752.2021.04.007
阳性克隆单菌落接种到含有100 mL BMGY培养基的锥形瓶中,于28℃ 250 r/min培养16—20 h。8 000 r/min离心收集菌体,加1 mL BMMY培养基重悬,转接到100 mL BMMY培养基继续培养,并间隔24 h向培养基中添加甲醇至终浓度1.0%,诱导培养72 h。培养物经离心分离,分别收集上清和沉淀,用10% SDS-PAGE检测。
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