Bacterial Expression service

The advantages of E. coli expression systems include low cost, high expression, ease of scale up, and short turnaround time. Our collection of more than 10 host strains and numerous expression vectors guarantees selection of the most efficient expression system. To increase protein solubility, expression levels, and ease of purification, multiple fusion/affinity tags are available. Our proprietary AIE technology allows high yields of toxic proteins. For insoluble proteins we have developed an effective protein refolding system consisting of 20 refolding buffers optimized with 9 parameters. If large amounts of protein are required, we can produce and purify from cultures as large as 35-500 liters. Metabolic labeling with stable isotopes is also offered in the E. coli system.

E.coli Expression Flowchart


High success rate
The success rate of the soluble protein expression provided by ABclonal using E. coli can be up to 95%.
Optional expression vectors
A various of screened or reformed E. coli expression vectors are provided by ABclonal, including pET series, pBAD series ,pGEX series and pCold series, to meet the specific requirements of intracellular and periplasmic space secretory expression. 
Optional protein tags
ABclonal use solubilized tags such as SUMO, Trx, GST and NusA to improve hydrophilicity of protein in inclusion body expression.
Optional expression hosts
More than 10 E. coli expression hosts, including standard expression strain, protein expression enhanced strain, toxic protein expression strain, ultra-low temperature strain for enhancing soluble proteins expression and other expression strains reformed by ABclonal can be used to meet customers’ different requirement.
Large-scale production
1-4000L per batch.
One-stop Service
From gene to protein. Design and optimize gene, optimize protein expression conditions, protein purification and post processing, management of data and report. 

Package Details

Service Name Service Content Timeline
Plasmid Construction
  • Gene synthesis with codon optimization& subclone


3-5 Weeks
Protein Expression Test
  • Plasmid transformation
  • Exploration of expression condition,expression analysis and identification(SDS-PAGE and /or WB)
  • 200ml amplification in optimum condition and purification test


3 Weeks
Large-scale fermentation & purification
  • Scale up protein expression using optimized conditions
  • Protein affinity purification (desired protein amounts and purity)
  • Inclusion bodies denaturation & renaturation(if required)
  • Tag-free protein (if required), endotoxin removing(if required)
  • QC the purified protein
1-10L 2 Weeks
10-20L 3 Weeks
20-50L 3-4 Weeks
Above 50L 6-14 Weeks


QC: The purified protein is identified by SDS-PAGE/WB and MS (if required).

All service timelines are approximate. In most cases, we finish the custom project within the appointed time. However, optional steps might prolong the deliver timeline.

Custom protein service is charged step by step and save your valuable research costs.

Protein Service Quotation Request Form
  • For quotation requests and questions, you may contact us by email, phone, or via our online quotation system.
  • Orders can be placed by phone, email, fax, or online with a formal Purchase Order or credit card.
  • Please send your samples to NeoScientific, 86 Cummings Park, Woburn, Massachusetts.
  • Our customer service is available 24hours per day/7 days a week/365 days a year.


Custom Monoclonal Antibody
MassAb Technologies
Free Trial Custom Polyclonal Antibody
You will receive free purified antibodies for validation
Custom Peptides Synthesis
Start from $40/each