Zero Blunt™ PCR Cloning Kit, without competent cells
Zero Blunt™ PCR Cloning Kit, without competent cells
Invitrogen™

Zero Blunt™ PCR Cloning Kit, without competent cells

The Zero Blunt™ PCR Cloning Kit offers an easy method for high-efficiency (>80%) cloning of blunt-end PCR products amplified withRead more
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Catalog NumberQuantity
K27502020 Reactions
K27504040 Reactions
Catalog number K275020
Price (TWD)
7,980.00
Offre exceptionnelle en ligne
Ends: 31-Dec-2025
11,400.00
Save 3,420.00 (30%)
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Quantity:
20 Reactions
Price (TWD)
7,980.00
Offre exceptionnelle en ligne
Ends: 31-Dec-2025
11,400.00
Save 3,420.00 (30%)
Each
Add to cart
The Zero Blunt™ PCR Cloning Kit offers an easy method for high-efficiency (>80%) cloning of blunt-end PCR products amplified with proof-reading, thermostable DNA polymerases. The Zero Blunt™ PCR Cloning Kit uses the multipurpose cloning vector pCR™-Blunt and ExpressLink™ T4 DNA Ligase to generate a ligation product in a five-minute, room-temperature ligation step.

Features of the Zero Blunt™ Cloning™ Kit with pCR™-Blunt vector:
• Fast & convenient—5-minute, room-temperature ligation
• Efficient—ccdB gene for positive selection results in >80% clones with correct insert
• Flexible—choice of kanamycin or Zeocin™ resistance for flexible antibiotic selection

The pCR™-Blunt vector provides:
• EcoR I sites flanking the PCR product insertion site for excision of inserts
• T7 promoter/primer site for in vitro RNA transcription and sequencing
• M13 forward and reverse primer sites for sequencing or PCR screening

How Zero Blunt™ PCR Cloning Works
The Zero Blunt™ PCR Cloning Kit is designed to clone blunt PCR fragments (or any blunt DNA fragment) with a low background of non-recombinants. The pCR™-Blunt vector contains the lethal E. coliccdB gene fused to the C-terminus of LacZα (Bernard et al., 1994). Ligation of a blunt PCR fragment disrupts expression of the lacZα-ccdB gene fusion permitting growth of only positive recombinants upon transformation. Cells that contain non-recombinant vector are killed when the transformation mixture is plated.

Kit Configurations
The Zero Blunt™ PCR Cloning Kit is offered in a variety of configurations: with One Shot™ TOPO10 Chemically Competent E. coli (K2700-20 and K2700-40) and without competent cells (K2750-20 and K2750-40) in 20- and 40- reaction kit sizes.
For Research Use Only. Not for use in diagnostic procedures.
Specifications
Bacterial or Yeast StrainNot Included
Cloning MethodBlunt PCR
Product LineTOPO, Zero Blunt
Product TypePCR Cloning Kit
PromoterT7
Quantity20 Reactions
VectorBlunt DNA Cloning Vectors
FormatKit
Unit SizeEach
Contents & Storage
Zero Blunt™ PCR cloning kits contain linearized pCR™-Blunt vector, ExpressLink™ T4 DNA ligase , 5X ExpressLink™ T4 DNA ligase buffer, control template, dNTPs, sterile water, and M13 forward and reverse primers.

Store all components at -20°C. All reagents are guaranteed stable for 6 months when properly stored.

Frequently asked questions (FAQs)

What is the best molar ratio of PCR product:vector to use for TOPO TA cloning? Is there an equation to calculate the quantity to use?

We suggest starting with a molar ratio of 1:1 (insert:vector), with a range of 0.5:1 to 2:1. The quantity used in a TOPO cloning reaction is typically 5-10 ng of a 2 kb PCR product.

Equation:

length of insert (bp)/length of vector (bp) x ng of vector = ng of insert needed for 1:1 (insert:vector ratio)

What is the best ratio of insert:vector to use for cloning? Is there an equation to calculate this?

The optimal ratio is 1:1 insert to vector. Optimization can be done using a ratio of 0.5-2 molecules of insert for every molecule of the vector.

Equation:

length of insert (bp)/length of vector (bp) x ng of vector = ng of insert needed for 1:1 insert:vector ratio

I'm seeing a lot of vector-only colonies when I try to perform a negative control reaction using vector only (no insert) for a TOPO reaction. Is my TOPO vector re-ligating?

Using the vector only for transformation is not a recommended negative control. The process of TOPO-adaptation is not a 100% process, therefore, there will be “vector only” present in your mix, and colonies will be obtained.

I'm trying to clone in my phosphorylated PCR product into a TOPO vector, and I'm getting no colonies. However, when I clone the same product into a TA vector, everything works perfectly. Why is this?

Phosphorylated products can be TA cloned but not TOPO cloned. This is because the necessary phosphate group is contained within the topoisomerase-DNA intermediate complex of the vector. TOPO vectors have a 3' phosphate to which topoisomerase is covalently bound and a 5' phosphate. Non-TOPO linear vectors (TA and Blunt) have a 3' OH and a 5' phosphate. Phosphorylated products should be phosphatased (CIP) before TOPO cloning.

I'm able to get a lot of colonies, however, none contain my insert of interest. What should I do?

You may be cloning in an artifact. TA and TOPO Cloning are very efficient for small fragments (< 100 bp) present in certain PCR reactions. Gel-purify your PCR product using either a silica-based DNA purification system or electroelution. Be sure that all solutions are free of nucleases (avoid communal ethidium bromide baths, for example.)

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