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  • In-Fusion Cloning applications collection
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Home › Learning centers › Cloning › Applications and technical notes › Mutagenesis with In-Fusion Cloning

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User-generated protocol

Mutagenesis with In-Fusion Cloning

  • A single system for deletions, base substitutions, or additions
  • Flexible enough to use with any vector
  • Over 95% accuracy

Featured product: ♦ In‑Fusion Snap Assembly master mixes and bundles (for mutagenesis)

In-Fusion Cloning makes it easy to perform mutagenesis: it combines the power of In-Fusion technology with inverse PCR, a method for rapid in vitro amplification of the DNA sequences that flank a region of known sequence (Ochman et al. 1988). During inverse PCR, primers are oriented in opposite directions on your circular cloning vector (Figure 1). To perform mutagenesis with In-Fusion systems, design your PCR primers so that they have a 15-bp overlap with each other at their 5' ends and incorporate the mutation of interest. Use PrimeSTAR Max DNA Polymerase (a high-fidelity PCR polymerase included with all In-Fusion Snap Assembly bundles) to perform your PCR reaction, add In-Fusion master mix to your linearized PCR product, and transform the provided Stellar Competent Cells with the cloning reaction. You have a ≥95% chance of recovering your final desired construct—the first time and every time.

Experimental overview Deletion mutagenesis Insertions or substitutions Protocol overview References

Experimental overview  

  1. Think about your final construct. Choose the vector you want to modify and envision your final, mutated construct (Figure 1; mutation shown in yellow).
  2. Design your primers. Design inverse primers that overlap each other by 15 bp at their 5' ends and incorporate your desired deletion, substitution, or addition. Specific guidelines for mutagenesis primer design are described below.
  3. Utilize the power of In-Fusion technology. Using an inverse PCR protocol, amplify the vector with your new primers. Perform the In-Fusion Cloning reaction using the PCR product. The linear DNA will re-circularize at the site of the 15-bp overlap and will also contain your mutagenic changes. Use a portion of the In-Fusion Cloning reaction to transform the Stellar Competent Cells according to the In-Fusion Snap Assembly protocol.
  4. Obtain your final construct. Recover your mutant from the Stellar cells the following day.
Procedure for performing mutagenesis with In-Fusion technology

Figure 1. Procedure for performing mutagenesis with In-Fusion technology. The area where mutagenesis occurs is shown in yellow. After designing your experiment, perform the protocol (Step 3 above) on Day 1, and recover your final construct (Step 4 above) on Day 2. Note: Although all examples shown here involve protein coding (gene) sequences, you can use the same methods to modify noncoding sequences such as promoters or transcription factors.

Deletion mutagenesis  

Primer design is a key component of simple deletion mutagenesis using In-Fusion technology. To delete a region of your cloning vector, you must design primers that include 15-bp overlaps with each other at their 5' ends and do not include the bases to be deleted (Figure 2).

For easy understanding of the primer design concept, different regions of the vector backbone and primers are marked in color in the figure below. The deletion site is marked in yellow and the binding site for the reverse primer (pink and turquoise) spans the deletion. The binding site for the forward primer (turquoise and black) is located against the cloning vector backbone. The two primers overlap by 15 bp at their 5' ends (the common area in turquoise). Note that there is no gap between the pink and turquoise regions in the actual primer sequence—the deleted nucleotides are not included in either of the primers.

In-Fusion primer design for deletion mutagenesis

Figure 2. In-Fusion primer design for deletion mutagenesis. Primers are designed to eliminate a section of the original vector.

To create a series of C-terminal deletions, design only one forward primer that anneals to your cloning vector immediately downstream of the coding region, retaining the stop codon. Then design a series of reverse primers that include 15 bp of overlap with the forward primer at their 5' ends and span different regions to be deleted. In Figure 3, Construct A has the blue region deleted, Construct B has the blue and turquoise regions deleted, and Construct C has the blue, turquoise, and pink regions deleted.

In-Fusion primer design to create a series of C-terminal truncated proteins

Figure 3. In-Fusion primer design to create a series of C-terminal truncated proteins. Primers are designed to eliminate one or more contiguous sections of the original vector.

To create a series of N-terminal deletions, design one reverse primer that anneals to your cloning vector immediately upstream of the coding region, including a start codon. Then design a series of forward primers that retain the natural start codon, include 15 bp of overlap with a reverse primer at their 5' ends, anneal to the coding region you wish to maintain at their 3' ends, and span different deletions. In Figure 4, Construct D has the turquoise region deleted and Construct E has the turquoise and blue regions deleted.

In-Fusion primer design to create a series of N-terminal truncated proteins

Figure 4. In-Fusion primer design to create a series of N-terminal truncated proteins. Primers are designed to eliminate one or more contiguous sections of the original vector.

Insertions or substitutions  

To insert bases with In-Fusion Cloning technology, simply design primers that include 15-bp overlaps with each other at their 5' ends and contain the desired insertion(s) within the overlapping region (Figure 5). Only the 15 bases at the 5' ends of the primers are required to overlap, but depending on the length and sequence of your insertion, the overlap may be longer than 15 bp. Additional bases added to the primer will be maintained after the In-Fusion Cloning reaction.

Similarly, if you would like to change one or more bases in a construct, design primers that include 15-bp overlaps with each other and contain the desired substitutions within the overlapping region (Figure 5).

In-Fusion primer design for inserting or substituting bases

Figure 5. In-Fusion primer design for inserting or substituting bases. Primers are designed to insert additional bases or replace existing bases with different nucleotides (shown as Xs in the figure) in the original vector.

Protocol overview  

Please see the In-Fusion Snap Assembly user manual for detailed instructions.

  1. Select your vector and identify the mutation site.
  2. Design PCR primers as described above, keeping in mind these general guidelines:
    - Primers should be 18–25 bases long. Insertions may require longer primers.
    - Primers should be 40–60% GC.
    - Primer Tms should be 58–65°C. The difference between forward and reverse primer Tms should be ≤4°C.
  3. Prepare PrimeSTAR Max DNA Polymerase master mix:
    PrimeSTAR Max DNA Polymerase 12.5 μl
    Forward primer 200–300 nM
    Reverse primer 200–300 nM
    Template 0.1–5.0 ng
    H2O As needed
    Total reaction volume 25 μl
  4. Linearize the vector by inverse PCR using a three-step PCR protocol and PrimeStar Max DNA Polymerase.
    98°C 10 sec
    55°C 5 or 15 sec 30–35 cycles
    72°C 5 sec/kb
  5. Gel-purify the PCR product using the NucleoSpin Gel and PCR Clean-Up kit.
  6. Assemble the In-Fusion Cloning reaction:
    Linear construct containing your mutation 100 ng
    In-Fusion Snap Assembly Master Mix 2 μl
    H2O As needed
    Total reaction volume 10 μl
  7. Incubate the reaction at 50°C for 15 min.
  8. Transform Stellar Competent Cells with 2.5 μl of the In-Fusion Cloning reaction.
  9. The next day, screen for mutants. You have a ≥95% chance of recovering your final desired construct the very first time.

References  

Ochman H., Gerber, A. S., Hartl D. L. Genetic applications of an inverse polymerase chain reaction. Genetics 120(3):621–623 (1988).

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