3’ RACE Kit

Catalogue Number:

BIO-86032 20 Reactions


  • Rapid amplification of 3’ cDNA ends
  • Contains a highly efficient blend of reverse transcriptase and BIO-X-ACT™ Long DNA Polymerase


  • Studying alternative splicing forms of mRNA
  • Identification of translation termination codon
  • Characterizing 3’ untranslated sequence
  • Obtaining the full sequence of a gene


The 3' RACE Kit employs the rapid amplification of cDNA ends (RACE) PCR method for obtaining the full-length 3' cDNA sequence from a known partial cDNA sequence. Known sources of partial cDNA sequence include interaction trap assays (e.g. yeast 2 hybrid system), differential display, library screening, cDNA subtraction and microarray subtraction assays. This Kit is also suitable for the characterization of alternative splicing forms of eukaryotic mRNAs.

The Kit is ideal for the amplification and cloning of long sequences, owing to the inclusion of Bioline’s reagents BIO-X-ACT™ Long DNA Polymerase and Reverse Transcriptase. RiboSafe RNase Inhibitor is also included, to prevent RNA degradation, which is especially important for the analysis of rare transcripts.

The 3’-RACE Kit contains the following components:
Component 20 Reactions
5x RT Buffer 60μl
(200u/μl) Reverse Transcriptase 20μl
(10u/μl) RNase Inhibitor 20μl
(100mM) dNTP Mix 40μl
(50mM) MgCl2 50μl
(5u/μl) BIO-X-ACT Long 20μl
10x OptiBuffer 100μl
(1ug/μl) pUC19 cloning vector 50μl
DEPC-treated Water 1ml
3’ Outer Reverse Primer (10μM) 5’CAGTCGGTCCTGCAGGGTTCAAGCGCATCTGAGG3’ Sbf I 200μl
3’ Nested Reverse Primer (10μM) 5’CAGTCGGTCCTGCAGGGCATCTGAGGTGAACCATGA3’ Sbf I 200μl

Product Specifications

Batch details:
Batch No: See vial
Units per vial: See vial
Concentration: See vial

Storage Conditions:

The 3’ RACE Kit components can be stored for 6 months at -20°C.

Shipping Conditions:

On Dry Ice or Blue Ice

Safety Precautions:

Harmful if swallowed. Irritating to eyes, respiratory system and skin. Please refer to the material safety data sheet for information regarding hazards and safe handling practice.

Associated Products:

Product Name Pack Size Cat No
X-GAL/IPTG Solution 10ml BIO-37086
α-Select Gold Efficiency 1ml (20 x 50μl) BIO-85027
α-Select Bronze Competent Cells 2ml (10 x 200μl BIO-85025
CH3-Blue Competent Cells 1ml (10 x 100μl) BIO-85039


  • Purchase of this product does not convey a licence to perform any patented process.
  • This product insert is a declaration of analysis at the time of manufacture.
  • Research Use Only

3’ RACE Kit Overview

3’ RACE Overview:

Rapid Amplification of cDNA Ends (RACE) is a technique for the amplification of cDNA sequences from an internal site of an mRNA template and either the 3’ or 5’ end of the mRNA.

The 3’RACE procedure is demonstrated in the schematic diagram below. First strand cDNA synthesis is carried out with either total RNA or poly(A)-selected RNA, using the supplied 3’ RACE Adaptor and Reverse Transcriptase.

PCR is then performed on the cDNA template using the supplied 3’ RACE Outer Reverse Primer, BIO-X-ACT Long, Bioline’s high fidelity polymerase for long templates, and a forward primer (user supplied). A single amplification is usually sufficient; however, should the 3’ RACE reaction require further amplification, a 3’ RACE Nested Reverse Primer is provided.

PCR products can then be cloned into the supplied pUC19 cloning vector using the Sbf I sites included in the 3’ RACE Reverse Primers and a forward primer (user supplied, see bellow for design). Sbf I is an 8-base nucleotide recognition site, minimizing the chance of the cDNA being digested. For optimal ligation conditions we recommend using Quick-Stick Ligase (Cat Nos.BIO-27027, BIO-27028).


3’ RACE Reaction Protocol:

1) RNA Isolation

Ultra-pure total RNA is required to prevent inhibition of RACE reactions and to ensure representation of weakly expressed mRNA species. Use of TRIsure (Cat. No. BIO-38032 or BIO-38033) RNA extraction reagent will maximize success rates of downstream reactions and provide total RNA more representative of weakly expressed genes.

Total RNA should be analyzed by agarose gel electrophoresis. The 28S and 18S RNA bands should be discrete bands. The 28S RNA should be approximately twice the intensity of the 18S RNA. Human 28S RNA runs at approximately 5Kb and 18S RNA runs at approximately 1.9Kb. for more accurate determination of RNA integrity an automated microflow system such as the Experion (BioRad Laboratories) should be used.

The 3’ RACE Kit is compatible with total and poly(A) RNA. If the gene of interest is thought to be weakly expressed it is advisable that poly(A) RNA is extracted from TRIsure purified total RNA. Several poly(A) purification kits are commercially available. Poly(A) RNA will give approximately a 20 to 50 fold enrichment of target.

Resuspend total/poly(A) RNA in DEPC-treated Water at approximately (1μg/μl). For general handling of RNA and prevention of RNase please refer to the RNA Guide (www.bioline.com).

2) Design of Gene Specific Primer(s)

From the region of known sequence a forward gene specific primer (gsp) must be designed. The Outer Reverse primer has a melting temperature of 60°C. The user designed gene specific primer must have approximately the same melting temperature (60°C +/- 3°C). For cloning the 5’ of the primer must include the Sbf I restriction site.


A second nested forward primer may also be synthesized. This second primer should be the same sense as the first forward primer and contain common sequence with the 3’ end of the gene specific primer. For example if the user was interested in the gene β-actin:

1st gene specific β-actin primer: 5’ ATTACCTGCAGG –CGGTCGAGTCGCGTCCACCCG 3’ Sbf I β-actin sequence

1st gene specific β-actin primer: 5’ ATTACCTGCAGG –CGGTCGAGTCGCGTCCACCCG 3’ Sbf I β-actin sequence

…CCGGTCGAGTCGCGTCCACCCGCGAGCACAGCTTC… β-actin cDNA sequence CGGTCGAGTCGCGTCCACCCG 1st gene specific β-actin TCCACCCGCGAGCACAGCT 2nd gene specific β-actin (internal)

The primer should be between 22 and 30 nucleotides in length, with a GC content of between 50 to 60%. Avoid self-complimentary primers. We recommend using freely available software such as Primer3 to design primers (http://frodo.wi.mit.edu/cgi-bin/primer3/primer3_www.cgi). It is advisable to design a pair or PCR primers within your known sequence in order to verify that the mRNA of interest is present in the total or poly(A) RNA.

3) Reverse Transcription of RNA (generation of single-strand cDNA with RACE Adaptor)

Prepare a mix containing the following:
Total RNA 0.5 to 5.0μg
or Poly(A) RNA 0.1 to 0.5μg
dNTPs (100mM) 2μl
3’ RACE Adaptor 4μl
DEPC-treated Water to 20μl final volume
Incubate at 65°C for 5 minutes to denature secondary structure, incubate on ice for 2 minutes.
Add the following to the 20μl denatured RNA:
RNase Inhibitor (10u/μl) 1μl
Reverse Transcriptase (200u/μl) 1μl
5x RT buffer 3μl
DEPC-treated Water 6μl
Incubate at 42°C for 60 minutes

4) Ensure gene is present in RNA (optional)

Verify that the gene of interest is present in the cDNA using forward and reverse primers designed against known sequence.

5) Amplification of unknown 3’ sequence using RACE adapted cDNA

1μl RACE adapted cDNA (from step 3)
1μl User designed gsp (10μM)
1μl 3’ Outer Reverse Primer (10μM)
1μl dNTPs
5μl 10x OptiBuffer
4μl MgCl2 (50mM)
1μl BIO-X-ACT Long
38μl Water (ddH2O)

Recommended Parameters for PCR of a 5Kb fragment with either BIO-X-ACT Long:

Temperature Duration Cycles
95°C (initial denaturation) 5 minutes 1
95°C (denaturation) 30 sec 30
annealing temperature)* 1 min 30
68°C (elongation) 5 min 30
68°C (final elongation) 10 minutes 1
Note*: Annealing temperature is primer dependent

6) Cloning of RACE products into pUC19 cloning vector

Digest the pUC19 vector using Sbf I restriction endonuclease.

The RACE PCR products contain Sbf I sites incorporated in the forward and reverse 3’RACE primers.


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