Bac-to-Bac® HBM TOPO® Secreted Expression System

Catalog number: A11339

Invitrogen™  Related applications: Protein Expression

Error loading your content!

  Catalog number
Select a plan
Unit size
Price ({{currency}}) Your price ({{currency}}) Availability Qty
{{product.sku}} {{product.sku}}
also known as {{product.formattedSku}} 
{{subscriptionDetails.selectedRatePlan.billingPeriod}} {{subscriptionDetails.selectedRatePlan.billingPeriod}} {{product.availability.message}}
Pro add-ons

Your on-site stock

›› {{supplyCenter.scName}}({{scProduct.stockOnHand}} In stock)
›› {{supplyCenter.scName}}(Out of stock)
›› {{supplyCenter.scName}}
This item is not currently available on-site. Depending on your Supply Center settings you may be able to add the item to cart above else use the Order Non-Stocked Items' tab on the Supply Center home page.
Back to top


Bac-to-Bac® Baculovirus Expression is an efficient method for producing baculovirus for high-level protein expression in insect cells. It relies on generation of recombinant virus by site-specific transposition in E. coli (DH10Bac™) rather than homologous recombination in insect cells. The new pFastBac™ HBM TOPO® vector enables secreted protein expression because it has the honeybee melittin (HBM) secretion signal. The new vector should be strongly considered for the expression of glycoproteins. Glycoproteins cannot be glycosylated in the absence of any secretion signal. In contrast to glycoproteins secreted from mammalian cells, glycoproteins secreted from baculovirus can be easily de-glycosylated in vitro. This is a very important feature in order to crystallize proteins!

The pFastBac™ HBM TOPO® vector has also a C-terminal His-Tag with a TEV cleavage signal to enable easy purification of Histidine fusion proteins on nickel-chelating resins (ProBond™ Purification System) and native proteins with the aid of AcTev™ protease.
The vector uses the strong polyhedrin promoter to generate high levels of expression in a variety of insect cell lines such as Sf9, Mimic™ Sf9, Sf21, and High Five™ cells in Sf-900 II & Sf-900™ III media from Gibco.

Traditional baculovirus systems require purification and amplification of an initial low-titer viral supernatant. This requires a time-consuming plaque assay. Bac-to-Bac®'s pFastBac™ vectors, however, recombines with the parent bacmid in DH10Bac™ E. coli competent cells to form an expression bacmid. Transfect the bacmid into insect cells for fast production of a high titer of pure recombinant baculovirus particles in the very first transfection. You'll save weeks of precious time. Collect a pure P2 baculovirus stock on Day 10 without the necessity of tedious plaques assay.
For Research Use Only. Not for use in diagnostic procedures.


Cleavage: TEV Protease Recognition Site
Promoter: Polyhedrin
Expression: Baculovirus, Insect
Key Function: Secreted Expression
Product Size: 20 reactions
Cloning Method: Blunt TOPO®
Expression Mechanism: Cell-Based Expression
Protein Tag or Fusion: His Tag (6x)
Selection Agent (Eukaryotic): None
High Throughput Compatibility: Not High Throughput-Compatible (Manual), High Throughput-Compatible

Contents & storage

Kit content for the Bac-to-Bac® HBM TOPO® Secreted Expression System (For details see the manual)
• Vector kit for 20 topo cloning reactions:
• pFastBac⁄HBM-TOPO® Vector containing the C-terminal TEV cleavage sit and His-Tag.
• pFastBac⁄CT-Gus Control Plasmid (Control expression vector)
• Other reagents supplied: 10x PCR, dNTP Mix, Salt Solution, Sterile Water, Control PCR template, Polyhedrin Forward Primer, SV40 pA Reverse Primer
• Kit containing competent cells (20 reactions):
• One Shot® Mach1-T1R Chemically Competent E. coli
• 4 kits with 5x 0.1 ml each of MAX Efficiency® DH10Bac™ Competent E. coli for 20 reactions
• 1 ml Cellfectin® II Reagent

Vector kit: store at -20°C
One Shot® Mach1-T1R Chemically Competent E. coli: store at -80°C
MAX Efficiency® DH10Bac™ Competent E. coli: store at -80°C
Cellfectin® II Reagent: store at +4°C


Manuals & protocols

Recommended products