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ID:34302374
大小:1.05 MB
页数:49页
时间:2019-03-04
《角毛壳葡聚糖酶基因克隆和在毕赤酵母中表达》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、ClassifiedIndex:Q933U.D.C:579DissertationfortheMasterDegreeinScienceCLONINGOFGLUCANASEGENEFROMChaetomiumcupreumandITSEXPRESSIONINPichiapastorisCandidate:WangXiaolongSupervisor:SongJinzhuAcademicDegreeAppliedfor:MasterofScienceSpecialty:BiologyAffiliation:SchoolofLifeScienceandTechnologyDateofDef
2、ence:July,2012Degree-Conferring-Institution:HarbinInstituteofTechnology摘要摘要中国是个农业大国,农药的用量巨大,且以化学农药为主。化学农药的长期使用会造成一系列的环境问题和食品安全问题,如易诱发抗药性,易产生剂量依赖,专一性差而破坏生态结构等。随着环保意识的提高,生物农药为此提供了行之有效而且绿色环保的解决方向。毛壳菌(Chaetomiumspp)是一类具有生防能力的真菌,可以用来做微生物源生物农药。它可产生降解植物病原真菌的细胞壁的几丁质酶和葡聚糖酶,结合其它一些机制来有效抑制植物病原真菌生长。本研究旨在找到角毛
3、壳菌的葡聚糖酶基因序列并测定其蛋白对植物病原菌的防治能力。从角毛壳菌基因组中克隆到葡聚糖酶基因cgc,全长1709bp,其中83bp-267bp是内含子序列。生物信息学方法分析表明此基因序列共编码541个氨基酸,前19氨基酸是信号肽序列,理论大小为55.6kDa。通过构建重组质粒+pPIC9K-cgc,电转化毕赤酵母GS115菌株中,筛选后得到4个Mut阳性转化子。诱导表达后得到目的蛋白在60kDa与100kDa之间。角毛壳重组葡聚糖酶蛋白最适温度约45℃,最适pH5.0,粗酶液酶活0.1283U,50%浓度下,对尖孢镰刀菌孢子萌发的抑制率为11.8%,在植物病原菌生物防治研究上具有潜
4、在的理论和实践上的意义。关键词:角毛壳菌(Chaetomiumcupreum);葡聚糖酶;生物防治;电转化;毕赤酵母;酶活;孢子萌发-I-AbstractAbstractChinaisavastagriculturalcountry,andhasaverybigpesticideconsumption,mostofwhichischemicalpesticides.Longapplicationofchemicalpesticidescancausemanyenvironmentalandfoodsafetyissues,suchasinducedresistance,dosedepe
5、ndentmanner,lowspecificitywhichmaydestroytheecosystemstructure,andsoon.Withtheincreaseoftheenvironmentalprotectionconsciousnessofpeople,biologicalpesticidesprovideaeffectiveandenvironmentalprotectivesolutiontosolvethoseproblems.Withtheabilityofbiologicalcontrol,Chaetomiumsppcanbeusedformicrobial
6、pesticides.Thisfungicangeneratetwoenzymeincludechitinaseandglucanasewhichcandegradethecellwallofplantpathogenicfungi,andinhibitthegrowthofplantpathogenicfungieffectivelywithothermechanisms.Chaetomiumcupreumisoneofthem.ThisstudyisdesignedtosearchforaglucanasegenefromChaetomiumcupreumandtestitsabi
7、litytopreventplantpathogenicfungi.AglucanasegenenamedcgcisfoundfromthegenomeofChaetomiumcupreum.Thisgeneis1709bp,andincludesoneintronfrom83bpto267bpandtwoextrons.Bioinformaticsanalysisshowsthatthisgenecanencode541aminoacidre
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