Technical Data Sheet

KAPA2G Robust HotStart Kit Codes and Components

ReadyMix PCR Kit KK5701

(1.25 mL) KAPA2G Robust HotStart ReadyMix (2X)
KR0381_S – v2.17 KK5702 (contains 2 mM MgCl2 at 1X)
(6.25 mL)
Product Description
KAPA2G Robust is a second-generation DNA polymerase KK5704
(1.25 mL) KAPA2G Robust HotStart ReadyMix with dye
engineered through a process of directed evolution. (2X)
KAPA2G Robust was engineered for improved processivity KK5705 (contains 2 mM MgCl2 at 1X)
and inhibitor tolerance, and offers significantly improved (6.25 mL)
performance with challenging assays when compared to
wild-type Taq DNA polymerase. In the HotStart formulation,
the enzyme is combined with a proprietary antibody that
Quick Notes
inactivates the enzyme until the first denaturation step.
This eliminates spurious amplification products resulting • KAPA2G Robust HotStart ReadyMix PCR Kits
from nonspecific priming events during reaction setup and contain an antibody-mediated hot-start formulation
initiation, and increases overall reaction efficiency. of KAPA2G Robust DNA Polymerase, engineered
for high processivity and inhibitor tolerance.
In the ReadyMix PCR Kit, KAPA2G Robust HotStart DNA
Polymerase is supplied in a convenient 2X ReadyMix • Both purified genomic DNA, and crude samples
format, containing all reaction components except primers (e.g. colony PCR) can be used as template.
and template. The ReadyMix contains KAPA2G Robust • Use 15 sec/kb extension time per cycle, and
HotStart DNA Polymerase (1 U per 25 µL reaction) in a increase to 30–60 sec/kb for difficult amplicons or
proprietary reaction buffer containing dNTPs (0.2 mM of templates.
each dNTP at 1X), MgCl2 (2 mM at 1X) and stabilizers. A • KAPA2G Robust HotStart ReadyMix contains 2 mM
ReadyMix with dye is also available – this contains two inert MgCl2 at 1X.
tracking dyes to enable direct loading of PCR products • KAPA2G Robust HotStart ReadyMix with dye
onto agarose gels for analysis by electrophoresis, without includes two inert tracking dyes to allow direct
the need to add a DNA loading solution. loading onto agarose gels.
DNA fragments generated with KAPA2G Robust HotStart • KAPA2G Robust HotStart ReadyMix is ideal for
DNA Polymerase have the same characteristics as single-protocol PCR, i.e. amplification of fragments
DNA fragments generated with wild-type Taq DNA varying from 25–65% GC, up to 1 kb in size, using a
polymerase, and may be used for routine downstream single reaction setup and cycling protocol.
analyses or applications, including restriction enzyme • Reaction products are 3’-dA-tailed and may be
digestion, cloning, and sequencing. Like wild-type Taq, cloned into TA cloning vectors.
KAPA2G Robust HotStart has 5’g3’ polymerase and
5’g3’ exonuclease activities, but no 3’g5’ exonuclease
(proofreading) activity. The fidelity of KAPA2G Robust
In addition to these applications, KAPA2G Robust
HotStart is similar to that of wild-type Taq; it has an error
HotStart ReadyMix is also suitable for single-protocol
rate of approximately 1 error per 1.7 x 105 nucleotides
PCR, which involves the amplification of DNA fragments
incorporated. PCR products generated by KAPA2G
<1 kb in size, with GC content varying from 25–65%. The
Robust HotStart are 3’-dA-tailed and may be cloned into
addition of DMSO for amplicons above 65% GC enables
TA cloning vectors.
amplification up to 85% GC. This allows consolidation of
Product Applications assays which typically require different reaction conditions
and cycling protocols when amplified with wild-type DNA
KAPA2G Robust HotStart ReadyMix is ideally suited for polymerases. For more information, please refer to the
the amplification of DNA fragments <5 kb in standard end- Single Protocol PCR Application Note, available from
point PCR assays from a wide variety of templates. They www.sigmaaldrich.com.
are particularly suited for:
• Assays which perform poorly with wild-type Taq The KAPA2G Robust HotStart ReadyMix may be
combined with KAPA Express Extract for fast and efficient
• Amplification of DNA fragments with high GC- or AT- DNA extraction and PCR. For more information, refer to
content the application notes for:
• Amplification from template samples that contain PCR
inhibitors (e.g. salts, urea, SDS, ethanol, EDTA) at • Blood PCR
concentrations that inhibit wild-type Taq • Mammalian DNA barcoding
• Amplification from crude samples, e.g. colony PCR, • Fish DNA barcoding
or PCR from crude extracts, such as those prepared
using KAPA Express Extract. • FFPE PCR.

Effective date: September 2017 For Research Use Only. Not for use in diagnostic procedures.
KAPA2G Robust HotStart ReadyMix PCR Kit Technical Data Sheet
Standard PCR Protocol Step 3: Run the PCR
IMPORTANT! The KAPA2G Robust HotStart ReadyMix • Perform PCR with the following cycling protocol:
contains an engineered DNA polymerase and uniquely-
formulated buffer, and requires specialized reaction Step Temperature Duration Cycles
conditions. If these conditions are not adhered to, reaction
Initial denaturation 1
95ºC 3 min 1
failure is likely. Refer to Important Parameters for more
information. Denaturation 95ºC 15 sec

Step 1: Prepare the PCR master mix Annealing2 55–65ºC 15 sec 30–404

• Ensure that all reagents are properly thawed and mixed. Extension3 72ºC 15–60 sec/kb
• Prepare a PCR master mix containing the appropriate Final extension 72ºC 1 min/kb 1
volume of all reaction components common to all or a
subset of reactions to be performed. 1
Initial denaturation for 3 min at 95°C is sufficient for most applications. Use 5 min
at 95°C for GC-rich targets (>70% GC content).
• Calculate the required volumes of each component 2
KAPA2G Robust HotStart ReadyMix is uniquely formulated to allow for use of a
based on the following table: single annealing temperature for a wide range of primer lengths, GC contents and
calculated melting temperatures. Use 60°C as a first approach, and adjust only if
necessary.
Component 25 µL reaction1 Final conc.
3
Use 15 sec extension per cycle for targets ≤1 kb, and 30–60 sec/kb for longer
PCR-grade water Up to 25 µL N/A fragments, or to improve yields.

5X KAPA2G Robust 4
The number of cycles required is dependent on the size of the amplicon, and the
12.5 µL 1X
HotStart ReadyMix2 amount of template copies per reaction. A 35-cycle PCR can typically amplify a
high yield of product from 100 copies of template. For crude samples, higher cycle
100% DMSO (optional)3 1.25 µL 5% numbers may be required.

10 μM Forward Primer 1.25 µL 0.5 μM Product Specifications

Shipping, storage and handling
10 μM Reverse Primer 1.25 µL 0.5 μM
KAPA2G Robust HotStart ReadyMix PCR Kits are shipped
Template DNA4 As required As required on dry ice or ice packs, depending on the country of
destination. Upon arrival, store kit components at -15°C
1
For volumes smaller than 25 μL, scale reagents down proportionally. Reaction to -25°C in a constant-temperature freezer. When stored
volumes >25 µL are not recommended.
under these conditions and handled correctly, full activity
2
KAPA2G Robust HotStart ReadyMix contains 2 mM MgCl2 at 1X. Additional MgCl2 of the kit is retained until the expiry date indicated on the
may be added separately if required. kit label. The ReadyMix contains isostabilizers and may
3
For amplicons with a GC content >65%, supplement reactions with 5% DMSO.
not freeze solidly, even when stored at -15°C to -25°C.
This will not affect the shelf-life of the product.
3
Use <100 ng genomic DNA (10–100 ng) and <1 ng less complex DNA (0.1–1 ng)
per 25 µL reaction as first approach. Always ensure that the product has been fully thawed and
mixed before use. Reagents may be stored at 2°C to 8°C
for short-term use (up to 1 month). Return to -15°C to
Step 2: Set up individual reactions -25°C for long-term storage. Provided that all components
• Transfer the appropriate volumes of PCR master mix, have been handled carefully and not contaminated, the kit
template and primer to individual PCR tubes or wells is not expected to be compromised if left (unintentionally)
of a PCR plate. at room temperature for a short period of time (up to
3 days). Long-term storage at room temperature and 2°C
• Cap or seal individual reactions, mix and centrifuge to 8°C is not recommended. Please note that reagents
briefly. stored at temperatures above -15°C to -25°C are more
prone to degradation when contaminated during use, and
therefore storage at such temperatures is at the user’s
own risk.
Quality control
Each batch of KAPA2G Robust HotStart DNA Polymerase
is confirmed to contain <2% contaminating protein (Agilent
Protein 230 Assay). KAPA2G Robust HotStart ReadyMix
PCR Kits are subjected to stringent quality control
tests, are free of contaminating exo- and endonuclease
activity, and meet strict requirements with respect to DNA
contamination levels.

2 For Research Use Only. Not for use in diagnostic procedures.

KAPA2G Robust HotStart ReadyMix PCR Kit Technical Data Sheet
Important Parameters Primers
Cycling protocol Primers should be designed to eliminate the possibility
of primer-dimer formation and nonspecific annealing,
KAPA2G Robust HotStart is a highly processive DNA and should have a GC content of 40–60%. Primers with
polymerase, capable of amplifying DNA fragments of up a GC content >60% may require higher denaturation
to 1 kb in size with a 15 sec/cycle extension time. The use temperatures and/or longer denaturation times, while
of excessive extension times is likely to result in smearing primers with a GC content <40% may require annealing
and nonspecific amplification. For amplicons <1 kb with temperatures <60°C, and/or increased MgCl2 and primer
genomic DNA as template, 15 sec per cycle should be concentrations. Furthermore, primer sets should be
sufficient for a high yield of product. In the case of longer designed to have similar theoretical melting temperatures.
amplicons, the time may be increased to a maximum of
60 sec/kb, in 15 sec increments. NOTE: Always dilute and store primers in a buffered
solution (e.g. 10 mM Tris-HCl, pH 8.0 – 8.5) instead of
Assays that are likely to require longer extension times PCR-grade water to limit degradation and maintain primer
include extremely GC-rich targets (>75% GC), as well as quality.
amplification from crude samples, or template samples
that are contaminated with inhibitors. Should the initial MgCl2 concentration
assay with a 15 sec/kb extension time produce low yields KAPA2G Robust HotStart ReadyMix contains 2 mM MgCl2
or no product at all, the extension time may be increased at 1X, which is sufficient for most applications. Longer
to a maximum of 60 sec/kb, in 15 sec increments. Note amplicons (>2 kb) and AT-rich PCR, as well as amplification
that if amplification fails completely, annealing temperature using primers with a low GC content (<40%), are likely to
optimization is likely to be required. require additional MgCl2.
In addition to extension time, the annealing time is critical GC-rich PCR
to ensure success. KAPA2G Robust HotStart has much For GC-rich amplicons (>65% GC content), supplement
higher activity than wild-type Taq at temperatures typically reactions with 5% DMSO. Should this not result in
used for annealing (~60°C), so the use of excessive successful amplification, use the KAPA2G Robust
annealing times often results in the same effects as (HotStart) PCR Kits, according to the recommendations in
excessive extension times. Typically, the formation of the Routine GC-rich PCR Application Note available from
nonspecific products that are larger than the target band www.sigmaaldrich.com.
indicates that the annealing time used is too long.
The number of cycles to use is dependent on the number
of template copies present at the beginning of the reaction.
For routine applications, 35 cycles is sufficient for a high
yield of product. However, if the template DNA contains
a high number of copies, cycle numbers may be reduced
accordingly.
Annealing temperature
Generally, an annealing temperature of 60°C produces
good results with KAPA2G Robust HotStart. Use 55°C
for primers with calculated Tm of <55°C, 60°C for primers
with calculated Tm of 55–65°C, and 65°C for primers with
calculated Tm above 65°C. If necessary, optimize annealing
temperatures with gradient PCR or adjust annealing
temperatures as follows:
• If a low yield of only the specific product is obtained,
lower the annealing temperature in 2°C increments.
• If nonspecific products are formed in addition to the
specific product, increase the annealing temperature
in 2°C increments.
• If no product is formed (specific or nonspecific), reduce
the annealing temperature by 5°C. If primers are highly
AT-rich, MgCl2 concentration may have to be increased.
• If only nonspecific products are formed (in a ladder-like
pattern), increase the annealing temperature by 5°C or
try recommendations for GC-rich PCR (see Important
Parameters: GC-rich PCR).

For Research Use Only. Not for use in diagnostic procedures. 3

KAPA2G Robust HotStart ReadyMix PCR Kit Technical Data Sheet

Troubleshooting

Symptoms Possible causes Solutions

No amplification or Increase the extension time to a maximum of 60 sec/kb (in 15 sec increments).
low yield Cycling protocol
Increase the number of cycles.

Annealing temperature is too Reduce the annealing temperature by 5°C.

high Optimize the annealing temperature by gradient PCR.

Excess template DNA chelates Mg2+. Either reduce the template concentration
to <100 ng, or increase MgCl2.
Template DNA quantity and
Check template DNA quality. Store and dilute in a buffered solution, not water.
quality
Template may contain inhibitors. Perform dilution series PCR to determine
optimal template concentration.
Some primers anneal more efficiently than others. Increase the primer
Primer concentration concentration, or optimize MgCl2 to improve primer binding.
Store and dilute primers in a buffered solution, not water.

MgCl2 Optimize MgCl2 concentration. AT-rich PCR typically requires more MgCl2.

Nonspecific Use <100 ng of DNA per reaction, or reduce the number of cycles.
amplification or Template DNA
smearing Check template DNA quality.
Excessive annealing and/or extension times will result in nonspecific
amplification, typically of bands larger than the target band. Reduce the
annealing and extension times to a minimum of 10 sec each.
Cycling protocol
If you are using a slow-ramping cycler (<3°C/sec heating/cooling rate), reduce
the denaturation and annealing times to 10 sec each, with 10 sec extension
per cycle.
A sub-optimal annealing temperature will result in nonspecific amplicons
Annealing temperature is too
that are typically smaller than the target band. See Important Parameters:
low
Annealing Temperature.

High target GC content Supplement reactions with 5% DMSO (amplicons with >65% GC).

Some primers anneal more efficiently than others. Decrease the primer
Primer concentration concentration.
Store and dilute primers in a buffered solution, not water.

Manufacturing, R&D Technical Support

Cape Town, South Africa sigma-aldrich.com/techservice
Tel: +27.21.448.8200
Fax: +27.21.448.6503

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4 For Research Use Only. Not for use in diagnostic procedures.