Expression System
Expression System — A biological system (E. coli, yeast, mammalian cells) engineered to produce a recombinant peptide or protein from an introduced gene.
What Is an Expression System?
An expression system is the combination of host organism and vector used to produce recombinant peptides. The choice of expression system determines peptide yield, folding, PTM capability, endotoxin content, and scalability. Most recombinant peptides are produced in E. coli, but eukaryotic systems are needed for complex modifications.
Common Systems
- E. coli: Highest yield, lowest cost. No PTMs. Often forms inclusion bodies requiring refolding
- CHO cells: Mammalian. Full PTMs including glycosylation. Used for commercial biologics
- Yeast (Pichia): Eukaryotic folding/secretion. Some glycosylation. Cost-effective at scale
- Insect (baculovirus): Good folding and some PTMs. Complex disulfide peptides
Frequently Asked Questions
What is Expression System?
A biological system (E. coli, yeast, mammalian cells) engineered to produce a recombinant peptide or protein from an introduced gene.
Why is Expression System important in peptide research?
Expression System is a fundamental concept in manufacturing as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.
Authority Sources
- Expression System on Wikipedia
- Search Expression System on PubChem (NIH)
- Research articles on ScienceDirect