产品信息

The HiScribe T7 High Yield RNA Synthesis Kit is an extremely flexible system for in vitro transcription of RNA using T7 RNA Polymerase. The kit allows for synthesis many kinds of RNA including internally labeled and co-transcriptionally capped transcripts.

RNA synthesized from the kit is suitable for many applications including RNA structure and function studies, ribozyme biochemistry, probes for RNase protection assays and hybridization based blots, anti-sense RNA and RNAi experiments, microarray analysis, microinjection, and in vitro translation and RNA vaccines.

The kit contains sufficient reagents for 50 reactions of 20 μl each. Each standard reaction yields up to 180 μg of RNA from 1 μg control template. Each kit can yield up to 9 mg RNA. For ³²P labeling, the kit contains enough reagents for 100 reactions of 20 μl each. 

Materials Not Included:

• DNA Template: The DNA template must be linear and contain the T7 RNA Polymerase promoter with correct orientation in relation to target sequence to be transcribed. 
• 3′-O-Me-m7G(5′)ppp(5′)G RNA Cap Structure Analog (NEB #S1411)
• m7G(5′)ppp(5′)G RNA Cap Structure Analog (NEB #S1404)
• m7G(5′)ppp(5′)A RNA Cap Structure Analog (NEB #S1405)
• G(5′)ppp(5′)A RNA Cap Structure Analog (NEB #S1406)
• G(5′)ppp(5′)G RNA Cap Structure Analog (NEB #S1407)
• Modified-NTP: Biotin-, Fluorescein-, Digoxigenin-, or Aminoallyl-NTP 
• Labeling: [α-³²P] labeled ribonucleotide (800-6,000 Ci/mmol) 
• General: 37°C incubator or PCR machine, nuclease-free water 
• DNase I: DNase I (RNase-free) (NEB #M0303) 
• Purification: Buffer- or water-saturated phenol/chloroform, ethanol and 3 M sodium acetate, pH 5.2, spin columns 
• Gel Analysis: Gels and running buffers, gel apparatus, power supply

Figure 1. Transcription by T7 RNA Polymerase

Figure 2. Time course of standard RNA synthesis from three DNA templates

Figure 3. Effect of template amount on RNA yield

Figure 4: Improved RNA yield and integrity from extended duration transcription reactions

产品类别:

RNA Capping,

RNA Synthesis In vitro Transcription (IVT)

• 试剂盒组成

  本产品提供以下试剂或组分：

  NEB #	名称	组分货号	储存温度	数量	浓度
  E2040S     -20       CTP  N0454AVIAL -20 1 x 0.1 ml 100 mM   FLuc Control Template N0426AVIAL -20 1 x 0.01 ml 0.5 µg/µl   UTP  N0453AVIAL -20 1 x 0.1 ml 100 mM   ATP N0451AVIAL -20 1 x 0.1 ml 100 mM   T7 RNA Polymerase Mix M0255AVIAL -20 1 x 0.1 ml Not Applicable   GTP  N0452AVIAL -20 1 x 0.1 ml 100 mM   10X T7 Reaction Buffer B2041AVIAL -20 1 x 0.1 ml Not Applicable   Dithiothreitol (DTT) B1222AVIAL -20 1 x 0.5 ml 100 mM

• 相关产品

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  • rNTP 混合液
  • rNTP 套装

操作说明、说明书 & 用法

• 操作说明

  1. DNA Template Preparation (E2040)
  2. RNA Synthesis with Modified Nucleotides (E2040)
  3. Purification of Synthesized RNA (E2040)
  4. Standard RNA Synthesis (E2040)
  5. Capped RNA Synthesis (E2040)
  6. High Specific Activity Radiolabeled RNA Probe Synthesis (E2040)
  7. Evaluation of Reaction Products (E2040)
  8. Poly(A) Tailing of RNA using E. coli Poly(A) Polymerase (NEB# M0276)
  9. Protocol for Co-transcriptional capping using CleanCap^® Reagent AG from TriLink and HiScribe^™ T7 High Yield RNA Synthesis Kit from New England Biolabs^®

• 说明书

  产品说明书包含产品使用的详细信息、产品配方和质控分析。

  • manualE2040

• 应用实例

  • Scaling of High-Yield In vitro Transcription Reactions for Linear Increase of RNA Production

FAQs & 问题解决指南

• FAQs

  1. Can I use the Monarch RNA Cleanup Kits to cleanup my in vitro transcription (IVT) reaction?
  2. How can I improve on a low yield of RNA from the transcription reaction?
  3. Are modified nucleotides included in the kit?
  4. Do I need to add DTT to the reaction?

• 问题解决指南

  Control Reaction

  The FLuc control template DNA is a linearized plasmid containing the firefly luciferase gene under the transcriptional control of T7 promoter. The size of the runoff transcript is 1.8 kb. The control reaction should yield ≥ 150 μg RNA transcript in 2 hours.

  If the control reaction is not working, there may be technical problems during reaction set up. Repeat the reaction by following the protocol carefully; take any precaution to avoid RNase contamination. Contact NEB for technical assistance.

  The control plasmid sequence can be found within the DNA Sequences and Maps Tool under the name “FLuc Control Plasmid”. The FLuc control template is generated by linearizing the plasmid with StuI.

  Low Yield of Full-length RNA

  If the transcription reaction with your template generates full-length RNA, but the yield is significantly lower than expected, it is possible that contaminants in the DNA template are inhibiting the RNA polymerase, or the DNA concentration may be incorrect. Alternatively, additional purification of DNA template may be required. Phenol-chloroform extraction is recommended (see template DNA preparation section).

  Low Yield of Short Transcript

  High yields of short transcripts (< 0.3 kb) are achieved by extending incubation time and increasing the amount of template. Incubation of reactions up to 16 hours (overnight) or using up to 2 μg of template will help to achieve maximum yield.

  RNA Transcript Smearing on Denaturing Gel

  If the RNA appears degraded (e.g. smeared) on denaturing agarose or polyacrylamide gel, DNA template is contaminated with RNase. DNA templates contaminated with RNase can affect the length and yield of RNA synthesized (a smear below the expected transcript length). If the plasmid DNA template is contaminated with RNase, perform phenol/chloroform extraction, then ethanol precipitate and dissolve the DNA in nuclease-free water (see template DNA preparation section).

  RNA Transcript of Larger Size than Expected

  If the RNA transcript appears larger than expected on a denaturing gel, template plasmid DNA may be incompletely digested. Even small amounts of undigested circular DNA can produce large amounts of long transcripts. Check template for complete digestion, if undigested plasmid is confirmed, repeat restriction enzyme digestion.

  Larger size bands may also be observed when the RNA transcript is not completely denatured due to the presence of strong secondary structures.

  RNA Transcript of Smaller Size than Expected

  If denaturing gel analysis shows the presence of smaller bands than the expected size, it is most likely due to premature termination by the polymerase. Some sequences which resemble T7 RNA Polymerase termination signals will cause premature termination. Incubating the transcription reaction at lower temperatures, for example at 30°C, may increase the proportion of full-length transcript, however the yield will be decreased. For GC rich templates, or templates with secondary structures, incubation at 42°C may improve yield of full-length transcript.

  If premature termination of transcription is found in high specific activity radiolabeled RNA probe synthesis, increase the concentration of “limiting NTP”. Additional “cold” NTP can be added to the reaction to increase the proportion of full-length transcript, however the improvement in yield of full-length product will compromise the specific activity of the probe.

   

• 实验技巧

  It is important to mix each component well before setting up reactions. 

  Make sure reactions are thoroughly mixed.

  We recommend incubating the reactions in a dry air incubator or in a PCR machine.