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ID:28325793
大小:8.20 MB
页数:71页
时间:2018-12-09
《settafiβ和chmp6的克隆 表达 纯化以及初步晶体学分析》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、摘要及其相关蛋白质做了深入的研究工作并做出相关报道,但是具体的作用机制目前仍不甚清楚。对其结构的研究将为人们探索跨膜蛋白的降解机制提供重要基础。我们的工作主要集中于ESCRT-III中CI-IMP6亚基各个结构域的结构生物学研究。本论文研究计划中,已经顺利完成了整个课题的前期工作,包括CHMP6人工嵌合蛋白的构建、表达、纯化、晶体生长条件的筛选。本文简要介绍了CHMP6蛋白作为囊泡转运分类复合体亚单位的生物学功能,并对它与相关蛋白的同源性及保守性进行了一些讨论。文章中较为细致地讨论了整个实验的设计,材料与方法,操作过程及其遇到的问题与相应的解决方案,最后阐述了现阶段已取得的实验进展,对实验
2、结果做出合理的分析,并对于后期实验方案提出了一些设想与看法。关键词:囊泡转运分类复合体CHMP6X一射线衍射表达与纯化ABSTRACTABSTRACTIneukaryoticcells,allgenomicDNAwithahighdegreeofevolutionaryconservationofbasicprotein·-histoneandhistone-relatedchromatinassemblyfactorsconstituteanucleosomestmctIlre:therepetitionofthiselementformschromatinstructure.Chrom
3、atinstructurewouldpreventavarietyofenzymesandtheDNA-associatcdfactorfromapproachingtheDNAmolecule.Therefore,themaintenanceofchromatinstnlctureplaysallimportantroleintheeukaryoticgeneregulation.Changesinchromatinstmcturedependonthehistonemodificationandconformationalchange.Histonechaperoneisakindof
4、importantfactorsinvolvedinhistoneregulation.HistonechaperoneSETwhichisalsonamedtemplateactivatingfactorIp(TAr-Ip)isencodedbythesetgene.ThegeneWasfirstidentifiedinacuteundifferentiatedleukemia(AUL)asafusiongene晰也cangene.AseriesoffunctionaltestsshowthatSET/TAF-I[3isamulti—functionalprotein,involvedi
5、nmanyphysiologicalpathways,suchasthehistonebinding,nucleosomeassembly,DNAreplication,transcriptionandapoptosis.BiochemicalexperimentsshowthatSET/TAF—18containsanacidicdomain.Intheabsenceoftheacidicdomain,SET厂rAF-IBlosestheI-12A-H2Bhistonebindingactivityandinhibitionofhistoneacet)rlation.Histonecha
6、peroneswhichhavebeenisolatedshowahighdiversityofprimarystructure.Becauseoftheirquaternarystructureofthepoorlyunderstood,therelationshipbetweens虹uctureandfunctionhasnotbeenuniform.Recentstudiesonthes在ucnIreandfunctionofhistonechaperonesindicatethesimilaritiesanddifferencesbetweenthem.UptOdate.thes仃
7、ucnlreoffulllengthofSET/TAF—113hasnotbeenresolved.TolearnmoreabouttheSET厂】jAF-18s缸1lctureandmechanism,wecloned,expressedandpurifiedtheN—terminaltruncated22aminoacids,butwithacidicdomainofhumanSET/TAF—Ipprotein.Th
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