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E. coli expression system is the most widely used expression method. Advantages of E.coli expression system includes: clear genetic background and metabolic pathway, mature method for expression regulation and time-saving cell culture. 

E.coli Expression Standard Service

​Service highlight:
1.   Good solution for challenging proteins and other difficult projects.
2.  Affordable, flexible and creditable service tailored to match your research requirements.
3.  Fast lead time - start from 5 weeks your protein will be delivered.
4.  State-of-the-art technologies - codon optimization and protein refolding.
5.  One-stop service platform from gene to protein.
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2. Multiple choices for vectors, E.coli strains, tags and Restriction Enzyme cutting sites. Vector bank for different target protein: pET series, pBAD series and pCold series.
3. Multiple tag options: His, GST, Trx, SUMO, Flag, HA, as well as tandem tags.

Service and Timeline	Service Description	Deliverables	Price
P110111 E.coli-Ready 3 – 4 Weeks	1. Transformation and clone selection. 2. Small volume e.coli fermentation and Expression test. 3. Affinity purification (1-step). 4. Protein denaturing and renaturing if the protein is expressed in the inclusion body. 5. SDS-PAGE test. 6. QC and report. Addition: > Gene codon optimization, synthesis and reconstructed plasmid.	1. 0.2mg-1mg purified protein. 2. Data and QC report.	Inquiry​
P110112 E.coli-StepUp 7 – 9 Weeks	1. Condon optimization and gene synthesis (1000bp free). 2. Transformation and clone selection. 3. Midi volume (xxx mL) fermentation and expression test: up to 8 different conditions. 4. Protein denaturing and renaturing if the protein is expressed in the inclusion body. 5. Protein purification (1-step affinity purification). 6. WB and SDS-PAGE test. 7. QC and report.	1. 0.5mg-5mg purified protein. 2. Data and QC report.	Inquiry​
P110113 E.coli-Comfo 7 – 9 Weeks	1. Condon optimization and gene synthesis (free of charge). 2. Minimum 2 expression strains and/or vectors will be tested: transformation and clone selection. 3. 200mL - 1L fermentation and expression condition test: up to 16 different conditions. 4. Protein denaturing and renaturing if the protein is expressed in the inclusion body. 5. Protein purification with 2 steps, purity polishing to >85%. 6. WB and SDS-PAGE test. 7. QC and report.	1. 1mg - 20mg purified protein. 2. Data and QC report.	Inquiry​
P110102 1L E.coli fermentation 1 Week	1L E.coli fermentation and protein purification for 1 clone.	Up to 500mg purified protein.	Inquiry​
P110103 5L E.coli fermentation 1 – 1.5 Week	5L E.coli fermentation and protein purification for 1 clone.	Up to 2500mg purified protein.	Inquiry​

 

Comparison of different types of service

Service type Content	E.coli Ready	E.coli StepUp	E.coli Comfo
Codon optimization	-	✓	✓
Gene synthesis	-	✓	✓
Multiple vector or multiple strain test	-	-	✓
Expression temperature test: HighT °C	✓	✓	✓
Expression temperature test: LowT °C	-	✓	✓
Expression temperature test: MediumT °C	-	-	✓
Expression duration test (time points)	1	2	3
Multiple concentration of inducing reagent	1	2	2
Fermentation volume	80mL	200mL	200mL – 1L
Affinity purification	✓	✓	✓
2nd purification: purity enhancement	-	-	✓
SDS-PAGE analysis	✓	✓	✓
WB analysis	-	✓	✓
Data, QC and report	✓	✓	✓
Video meeting support	-	-	✓
Purified protein	0.5mg – 2mg	0.5mg – 5mg	1mg – 20mg
	Inquiry​	Inquiry​	Inquiry​

 

Optional Service 1. Tag remove 2. Endotoxin removal 3. 10L~4000L fermentation 4. Inclusion body protein denaturing and renaturing 5. Western Blot for protein confirmation 6. Mass Spectrometry More information: Please Email to [email protected] if you need special service for E. Coli Expression service.

List of Vectors	Commercial vectors, low temperature expression vectors.
List of Expression Strain	Special stains for your special protein: High expression strain, low temperature strain, toxic protein expression strain, rare codons expression strain and disulfide bonds expression strain.