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T4 RNA Ligase 2, truncated KQ

Catalog # Concentration Size List Price Quantity Your Price
M0373L 200000 units/ml 10000 units $468.00
$421.20
M0373S 200000 units/ml 2000 units $117.00
$105.30
Catalog # Size List Price Your Price
M0373L 10000 units $468.00
$421.20
M0373S 2000 units $117.00
$105.30
Catalog #
Qty:
 
*On-line ordering is for Canadian customers only. Web pricing is applicable only to orders placed online at www.neb.ca

T4 RNA Ligase 2, truncated KQ ligates the pre-adenylated 5´ end of DNA or RNA to the 3´ end of RNA.

  • Reduced lysyl adenylation activity
  • Isolated from a recombinant source
  • Supplied with 10X Reaction Buffer
  • Requires 5' pre-adenylated RNA or DNA for ligation
  • Tested for the absence of endonucleases, exonucleases, RNases and phosphatases
  • Not sure which ligase to choose? Refer to our DNA and RNA Ligase Properties Chart
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    Avoiding RNase Contamination
T4 RNA Ligase 2, truncated KQ (T4 Rnl2tr R55K, K227Q) specifically ligates the preadenylated 5´ end of DNA or RNA to the 3´ OH end of RNA. The enzyme does not use ATP for ligation but requires pre-adenylated linkers.

T4 Rnl2tr R55K, K227Q is a double-point mutant of T4 RNA Ligase 2, truncated (NEB #M0242). Mutation of K227 in T4 RNA Ligase 2 reduces enzyme lysyl adenylation (1). K227Q reduces the formation of undesired ligation products (concatemers and circles) by T4 Rnl2tr (2,3), by reducing the trace activity of T4 Rnl2tr in transfer of adenylyl groups from linkers to the 5´-phosphates of input RNAs (3). Mutation of R55K in T4 Rnl2tr K227Q increases the ligation activity of the enzyme to levels similar to T4 Rnl2tr (3).

The exclusion of ATP, use of pre-adenylated linkers, and the reduced enzyme lysyl adenylation activity provide the lowest possible background in ligation reactions. This enzyme has been used for optimized linker ligation for high-throughput sequencing library construction of small RNA (4).
Product Source
T4 Rnl2tr R55K, K227Q is expressed as an MBP fusion from a plasmid in E. coli which encodes the first 249 amino acids of the full length T4 RNA Ligase 2 with an arginine to lysine and a lysine to glutamine mutations at positions 55 and 227, respectively.
Reagents Supplied

The following reagents are supplied with this product:

NEB # Component Name Component # Stored at (°C) Amount Concentration
  T4 RNA Ligase 2, truncated KQ M0373SVIAL -20 1 x 0.01 ml 200,000 units/ml
  T4 RNA Ligase Reaction Buffer B0216SVIAL -20 1 x 1.5 ml 10 X
  PEG 8000 B1004SVIAL -20 1 x 1 ml 1 X
  T4 RNA Ligase 2, truncated KQ M0373LVIAL -20 1 x 0.05 ml 200,000 units/ml
  T4 RNA Ligase Reaction Buffer B0216SVIAL -20 1 x 1.5 ml 10 X
  PEG 8000 B1004SVIAL -20 1 x 1 ml 1 X
Application Features
  • Ligate a pre-adenylated DNA or RNA sequence tag to any RNA 3´-end 
  • Join a single stranded adenylated primer to small RNAs for cDNA library creation 
  • Join a single stranded adenylated primer to RNA for strand-specific cDNA library construction.

Properties & Usage

Unit Definition

200 units is defined as the amount of enzyme required to give 80% ligation of a 31-mer RNA to the pre-adenylated end of a 17-mer DNA [Universal miRNA Cloning Linker (NEB #S1315)] in a total reaction volume of 20 μl in 1 hour at 25°C.

5´-FAM- rArGrUrCrGrUrArGrCrCrUrUrUrArUrCrCrGrArGrArUrUr CrArGrCrArArUrA-3´
5´-rAppCTGTAGGCACCATCAAT–NH2-3´

Reaction Conditions

1X T4 RNA Ligase Reaction Buffer 
Incubate at 25°C

1X T4 RNA Ligase Reaction Buffer 
50 mM Tris-HCl
10 mM MgCl2
1 mM DTT
(pH 7.5 @ 25°C)

Storage Buffer

10 ml Tris-HCl
100 mM NaCl
0.1 mM EDTA
1 mM DTT
50% Glycerol
pH 7.5 @ 25°C

Heat Inactivation

65°C for 20 minutes

Molecular Weight

Theoretical: 71378.96 daltons

Specific Activity

200,000 units/mg

Unit Assay Conditions

1X T4 RNA Ligase Reaction Buffer supplemented to 10% (w/v) PEG MW 8000, 20 pmol of 5´-FAM labeled RNA, and 40 pmol preadenylated DNA linker. After incubation at 25°C for 1 hour, the ligated product is detected on a 15% denaturing polyacrylamide gel.

Companion Products
Notes
  • In our tests, this ligase can be used interchangeablywith T4 Rnl2tr (NEB #M0242). Ligationactivity is stimulated by adding PEG (See FAQ).
References
  • Yin, S., Ho, C.K. and Shuman S. (2003). J. Biol. Chem.. 278, 17601-17608.
  • Hafner, M., et al. (2008). Methods. 44, 3-12.
  • Viollet, S., et al. (2011). BMC Biotechnol. 11, 72.
  • Zhuang, F., et al. (2012). Nucleic Acids Res.. 40(7), e54.
Quality Control Assay
Quality Control tests are performed on each new lot of NEB product to meet the specifications designated for it. Specifications and individual lot data from the tests that are performed for this particular product can be found and downloaded on the Product Specification Sheet, Certificate of Analysis, data card or product manual. Further information regarding NEB product quality can be found here.
Specifications
The Specification sheet is a document that includes the storage temperature, shelf life and the specifications designated for the product. The following file naming structure is used to name these document files: [Product Number]_[Size]_[Version]
Certificate of Analysis
The Certificate of Analysis (COA) is a signed document that includes the storage temperature, expiration date and quality controls for an individual lot. The following file naming structure is used to name these document files: [Product Number]_[Size]_[Version]_[Lot Number]
Safety Data Sheets
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This product is intended for research purposes only. This product is not intended to be used for therapeutic or diagnostic purposes in humans or animals.

New England Biolabs (NEB) is committed to practicing ethical science – we believe it is our job as researchers to ask the important questions that when answered will help preserve our quality of life and the world that we live in. However, this research should always be done in safe and ethical manner. Learn more.

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