Anoptimizedreversetranscriptasesystemfortheproductionoffull-lengthCDNA.
- Producefull-lengthcDNAwithRNAseH-mutant
- Achievehigherspecificityatelevatedtemperatures,upto55°C
EpiScript™RnaseH-ReverseTranscriptase(EpiScriptRT),analternativetoSuperScript®IIReverseTranscriptase,isarecombinantMMLVreversetranscriptasewithgreatlyreducedRNaseHactivity.Itishighlyefficientatproducingfull-lengthcDNAfromlongRNAtemplates.EpiScriptRTiscapableofproducingcDNAfromaslittleas50pgoftotalRNAforreal-timeRT-PCR(qRT-PCR)analysisandotherapplications.
Applications
- First-strandcDNAsynthesisforsubsequentPCRorreal-timePCR.
Benefits
- RecombinantMMLVreversetranscriptasewithgreatlyreducedRNaseHactivity
- Activeattemperaturesupto55°C
- Highlyefficientatproducingfull-lengthcDNAfromaslittleas50pgoftotalRNA
- BestvalueinanRNaseH-ReverseTranscriptase
Storage:Storeonlyat-20°Cinafreezerwithoutadefrostcycle.
StorageBuffer:EpiScriptRTissuppliedina50%glycerolsolutioncontaining50mMTris-HCl(pH7.5),100mMsodiumchloride,1mMDTT,0.1mMEDTA,and0.1%Triton®X-100.
UnitDefinition:OneunitofEpiScriptRTcatalyzestheincorporationof1nmolofdTTPintoacid-insolublematerialin10minutesat37°Cusingsaturatingamountsofoligo(dT)-primedpoly(rA)astemplate.
ContaminatingActivityAssays:EpiScriptRTisfreeofdetectableexonuclease,endonuclease,andRNaseactivities.
Figure1.EpiScript™ReverseTranscriptaseperformedequallyorbetterthancomparablereversetranscriptasesfromothervendors.First-strandsynthesisreactionswereassembledaccordingtomanufacturer´sspecifications.InputRNAwas1µgofJurkattotalRNA(Ambion®).Reactionswereprimedusing50ngofpoly-T(16-18)DNA.2ndstrandqPCRwasperformedusingBio-RadiQSYBRmastermixandgene-specificprimersthatyielded250-350bpamplicons.Reactionswererepeated4-fold.PGDF-R(PlateletDerivedGrowthFactorReceptor),TNF(TumorNecrosisFactor),IL-1b(Interleukin-1beta),IL-2(Interleukin2).ImagecourtesyofMatthewKellinger,Illumina®Inc.
Figure2(clicktoenlarge).EpiScript™ReverseTranscriptaseproducessimiliartranscriptcoverageindependentoftranscriptlength.EpiScriptwasusedtoprimefirststrandcDNAeitherfromtotalRNAusingoligo-dT(leftpanel)orpolyA+selectedRNAwithrandomhexamers(rightpanel).ThecDNAwasconvertedintoIllumina®-compatIBLelibrariesandsequenced.Thereadswerealignedtotranscriptsbaseduponvariouslengthclassesandreaddensityplottedrelativetothepercentdistancefromthe5´endofthetranscripts;0%referstothe5´endand100%isthe3´end.Asexpected,oligo-dTprimingresultsinamorepronounced3´biasthanrandompriming. |
Figure3.UseofEpiScript®ReverseTranscriptaseforfirststrandcDNAresultsindetectionofsimilartranscriptcategoriesindependentofinputamount.EpiScriptRTwasusedtorandomprime5ngor50pgofhumantotalRNAandthecDNAwasconvertedintolibrariesforIllumina®sequencing.ReadswerealignedusingTophatandannotatedwithCufflinksandthepercentageofeachmajorcategoryisvisualizedasapiechart.Equivalentresultsareobservedforboth5ngand50pgofinputRNA. |
ORDERINFORMATION
Contents:EpiScriptRNaseH-ReverseTranscriptase,10XReactionBuffer,100mMDTT.ebiomall.com
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只要是细胞,就得走向衰老,现代研究表明,细胞的衰老和端粒的变短有关系。端粒就是DNA,随着细胞分裂次数的增多,端粒在不断变短,端粒酶就是组织端粒变短的。然而正常细胞中,端粒酶的活性受抑制,端粒酶是怎么染端粒变长的呢?实际上端粒酶是由RNA组成的,可以根据碱基互补配对逆转形成DNA,使得变短的端粒变长。所以说端粒酶可以逆转录形成端粒,使端粒不减短!
逆转录(reverse transcription)是以RNA为模板合成DNA的过程,即RNA指导下的DNA合成。是RNA病毒的复制形式,需逆转录酶的催化。艾滋病病毒(HIV)就是一种典型的逆转录病毒。
逆转录与反转录严格意义上来说没有什么区别,但是逆转录是RNA类病毒自主行为,在整合到宿主细胞内以RNA为模板形成DNA的过程;反转录是进行基因工程过程中,人为地提取出所需要的目的基因的信使RNA,并以之为模板人工合成DNA的过程。二者虽同为RNA→DNA的过程,但地点不同,相对性的来说,逆转录在体内,反转录在体外。
2. 禽成髓细胞瘤病毒(AMV)反转录酶:有强的聚合酶活性和RNA酶H活性。最适作用温度为42℃。
3.Thermus thermophilus、Thermus flavus等嗜热微生物的热稳定性反转录酶:在Mn存在下,允许高温反转录RNA,以消除RNA模板的二级结构。
4.MMLV反转录酶的RNase H突变体:商品名为SuperScript 和SuperScriptⅡ。此种酶较其它酶能多将更大部分的RNA转换成cDNA,这一特性允许从含二级结构的、低温反转录很困难的mRNA模板合成较长cDNA。向左转|向右转
2、取灭过菌且无核酸酶的0.2ml离心管,依次加入2~5μgRNAnμL
3、65℃保温5min,然后冰浴5min;
4、往3步骤中的0.2ml离心管依次加入下列组份
RNase抑制剂(40u/μL)0.5μL
10×M-MLVReactionBuffer2μL
DTT(200mM)1μL
逆转录酶(M-MLV)1μL
5、轻轻混匀后,然后2000rpm离心20s;
6、先在37℃保温1hr,然后70℃保温15min;
7、上述产物可立即进行下一步的PCR反应或-20℃保存。向左转|向右转
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