ProtoScript®First Strand cDNA Synthesis Kitfeatures two optimized mixes, M-MuLV Enzyme Mix and M-MuLV Reaction Mix. M-MuLVEnzyme Mix combines M-MuLV Reverse Transcriptase and Murine RNase Inhibitor,while M-MuLV Reaction Mix contains dNTPs and an optimized buffer. The kit alsocontains two optimized primers for reverse transcription and nuclease-freewater. An anchored oligo-dT primer [d(T)23VN] forces the primer toanneal to the beginning of the polyA tail. The optimized Random Primer Mixprovides random and consistent priming sites covering the entire RNA templateincluding both mRNAs and non-polyadenylated RNAs. The first strand cDNA productgenerated is more than 10 kb (Figure 1).General Information forSuccessful cDNA Synthesis:Template RNAIntact RNA of high purity is essential for sensitive RT-PCR detection. RNAshould have a minimum A260/A280 ratio of 1.7 orhigher.Either total RNA or mRNA can be used in the reversetranscription reaction. Total RNA is generally sufficient for most RT-PCRanalyses. However, if desired mRNA can be easily obtained using a PolyA SpinmRNA Isolation Kit (NEB #S1560) or Magnetic mRNAIsolation Kit (NEB #S1550).The amount ofRNA required for detection depends on the abundance of the transcript ofinterest. In general 1 ng to 1 μg total RNA or 0.1-100 ng mRNA arerecommended.First Strand cDNA SynthesisReactionDenaturation of RNA and primer at 70°C for 5 minutes canremove secondary structures that may impede long cDNA synthesis. However, thisstep can be omitted in some cases (unpublished results).We recommendincubation at 42°C for one hour for maximum yield and length. However, manytargets can be detected after a much shorter incubation time. For example, 5minutes incubation is enough for a 2 kb cDNA synthesis.Choice ofPrimers for Reverse TranscriptionOligo d(T) priming is preferredfor most applications because it ensures that all cDNA copies terminate at the3´ end of the mRNA and produces the longest contiguous cDNA. An anchoredoligo-d(T) primer [d(T)23VN] forces the primer to anneal to the startof the polyA tail, thereby preventing priming at internal sites in the polyAtail (1). However, two other priming choices are possible if desired.The Random Primer Mix is an optimized mix of hexamer andd(T)23VN primers. It provides random priming sites covering theentire RNA templates including both mRNAs and non-polyadenylated RNAs (such asribosomal RNAs). The Random Primer Mix yields shorter cDNAs on average and canbe used for the detection of multiple short RT-PCR products. Random Primer Mixoffers good performance in a wide range of RNA templates.When agene-specific primer is used in a cDNA synthesis reaction, the cDNA product canbe used only for amplification of that transcript. This priming method givesgood results when the amount of RNA is limiting (below 10 ng) and only oneparticular cDNA is desired.Recommended primer concentration:PRIMER-- Final conc.OLIGO d(T)23VN -- -- 5 μM RANDOM PRIMER MIX --6 μM SPECIFIC PRIMER-- 0.1–1 μMFigure 1:First strand cDNA synthesis was carried out with 1X M-MuLV Enzyme Mix at 42°C using 2 μg of human spleen total RNA. Negative control reactions were carried out with 1X M-MuLV Reaction Mix. A fraction of the first strand cDNA product was used to amplify sequences specific for three different messenger RNAs using 1X LongAmp™ Taq 2X Master Mix (NEB #M0287 ). Lane 1: 1.1 kb of beta-actin gene. Lane 2: noRT control of 1.1 kb of beta-actin gene. Lane 3: 4.7 kb of Xrn-1 gene. Lane 4: noRT control of 4.7 kb of Xrn-1 gene. Lane 5: 9.8 kb of guanine nucleotide exchange factor p532. Lane 6: noRT control of 9.8 kb of guanine nucleotide exchange factor p532. Marker M is 2-Log DNA Ladder (NEB #N3200 ).
This product is related to the following categories:
RT-PCR Products,
Reverse Transcriptases & RT-PCR Products,
cDNA Synthesis & Reverse Transcriptases Products
This product can be used in the following applications:
cDNA Synthesis,
Reverse Transcription (cDNA Synthesis),
RT-PCR & cDNA Synthesis,
RT-qPCR, RT-PCR and cDNA Synthesis,
PCR
品牌介绍
New England Biolabs（NEB）公司 NEB公司——三十多年的卓越品质NEB公司成立于二十世纪七十年代中期，拥有众多经验丰富的科学家，是生产生命科学试剂的领导者。目前，NEB为基因组研究提供最齐全的重组酶和天然酶，并且公司业务范围已延伸至蛋白质组学和药品开发领域。回顾三十余年来的历程，NEB公司作为先驱公司之一，为促进生物科技工业的发展做出了巨大的贡献。NEB美国总部乔迁新址后拥有最尖端的设备，有一座现代化的发酵中心及设备齐全的实验室，这些实验室主要用于产品生产、质量监控、产品开发和基础科研之用。作为首批以商业规模生产限制性内切酶的公司之一，NEB一直专注于内切酶的研究，并保持业内领先水平。NEB公司一贯坚持以科学为本的原则，公司生产的试剂因其高质量、高性价比享誉世界。重组酶NEB公司对酶的生产与其基础科研不能分开，通过对限制/修饰系统的克隆和过量表达方面的研究，使我们能够大大降低成本，改善产品质量。NEB已经成功克隆了180多种内切酶，其中大多是完全克隆，少数是部分克隆。目前，NEB可供应240多种内切酶，其中180多种可以重组酶形式提供，同时还有大量的应用途广泛的重组聚合酶和重组修饰酶。质量与客户服务NEB公司凭借着严格的质检程序、深入的基础科研以及不断开发的研发项目，承诺为全球科技人员提供高纯度的科研产品。直接与NEB总部联系或与NEB的国际网点联系，即可体验到NEB的个性化客户服务。公司内负责生产以及负责进行质量监控的科学家（产品负责人）也就是技术支持人员。他们为客户解答有关限制核酸内切酶、甲基化酶、以及其他DNA修饰酶、蛋白质修饰酶方面的问题。同时，公司的有机合成部门可提供linkers、引物、adaptors、探针以及寡核苷酸合成等方面的信息。研究人员也可为客户提供技术支持服务，这些研究人员在DNA测序、甲基化、克隆、过量表达、发酵、蛋白质纯化以及蛋白质分析方面都有很深造诣。基础科研NEB在分子生物学和寄生虫学方面的基础研究由公司内部的资深科学家负责。这些科学家在他们各自的领域都卓有成绩，经常在业内著名杂志上发表文献，指导博士后工作、为大学生提供暑期实习机会，而且经常受邀去当地学校进行演讲。NEB鼓励公司与外界合作，每周学术探讨会为其他科学家们提供了交流和展示的平台。环保政策NEB公司在资助科研项目时最基本原则之一就是：一切工作都应符合保护生态环境。公司产品生产、分析以及运输过程既要满足产品的稳定性，也要符合我们的环保政策。20年来，NEB公司最引人注目的一项环保政策是：回收运输泡沫盒，虽然这项工作首创于美国，但是，目前加拿大、德国以及英国的分公司也同样实施了。公司还在内部开展多方位的回收工作，经常用再生纸张印刷市场宣传资料。这些小细节不会影响产品质量，但是对环境的保护却是显而易见。公司职责除环保政策外，通过基金会，NEB还竭力为改善当地社区及全人类尽微薄之力。NEB基金会创立于1982年，属私人性质，其宗旨是支持发展中国家的环保、教育、健康及艺术事业。此外，NEB捐款委员会也经常向当地社区进行捐款活动。
