We offer a range of protein expression systems and tools that are easy to use, designed to deliver high protein yields for a wide variety of downstream applications, and allow you to achieve results quickly. Creating your gene, purifying your plasmid, and selecting suitable protein expression products are simplified with help from our selection tools and educational videos.
On this page
Overview | Choosing expression | Additional information |
Selecting a host system for protein expression & production
When selecting a host system for expressing protein there are many factors to consider. These include: post translational modifications, equipment availability, and time constraints. We have mapped out the details for each host system, that along with information for applicable products the we offer, to allow you to make the most appropriate choice based on your needs and budget.
| Do you need modifications? | How quickly do you require protein? | What capabilities do you have to support expression (lab equipment & resources)? | |||||||
|---|---|---|---|---|---|---|---|---|---|
| None | Some | Complete | Days | Weeks | Months | None | Some | Many | |
| Mammalian |  | | | ||||||
| Bacteria |  | | | ||||||
| Yeast |  | | | ||||||
| Insect |  | | | ||||||
Equipment
- What equipment is available for use?
Type of protein
- Is your protein endogenously expressed in bacterial or yeast cells?
- Do you know that it’s insoluble in a bacterial expression system?
- Do you need native posttranslation modifications?
- Do you want some level of eukaryotic posttranslational modifications?
Desired preparation time
- One week or less (bacterial, transient mammalian)
- One month or less (in addition to bacterial and transient mammalian, yeast & insect systems can be used)
- More than one month (in addition to the systems above, you can use stable mammalian systems)
| Vector selection | Cloning | Transform in E. coli | Plasmid purification | Transfection | Expression | Purification | Analysis |
Determined by promoter and terminator | Determined by vector choice - or - | Recommend DH5α™ TOP10 strain | Could be maxi, mega, or giga | Depends on speed | Media based on expression system choice: 293 or FreeStyle™ | Affinity based with tag or native | Analysis & Assay |
| Vector selection | Cloning | Transform in E. coli | Plasmid purification | Transform | Optimization of clone | Scale & purify | Analysis |
Any vector with a T7 promoter | - or - | Recommend TOP10 strain but can choose from subcloning products | Mini prep kits | Transform into any expression strain | TB or LB | TB, LB, or MagicMedia™ & resin purification | Analysis & Assay |
| Vector selection | Cloning | Transform in E. coli | Plasmid purification | Transform into yeast | Clone selection | Express | Purification | Analysis |
Does protein have a secretion signal Yes? Use PichiaPink™ | Clone with restriction enzymes | One Shot® TOP10 Electrocomp™ E. coli | Yeast strain | Zeocin™ | Media | With secretion sometimes not necessary & affinity for tag | Analysis & Assay |
| Vector selection | Cloning | Transform in E. coli | Plasmid purification | Transform into Bac | Purify Bacmid | Transfect | Amplify/ Express | Analysis |
Choose TOPO® or Gateway® vector | Select TOPO® or Gateway® for cloning | Recommend DH5α™ TOP10 strain but can choose from subcloning products | Mini prep kits | Transform into DH10Bac | Midi or maxi prep- depending on yield requirement | Transfection with Cellfectin® II | SF9 & SF21 | Analysis & Assay |
How-to videos
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Improve protein expression up to 100-fold with GeneArt® expression-optimized genes.
For Research Use Only. Not for use in diagnostic procedures.