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Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...

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Fabrication and Characterization of Colorectal Cancer Organoids from SW1222 Cell Line in Ultrashort Self-Assembling Peptide Matrix

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Bioproduction and characterization of a pH responsive self-assembling peptide

Jessica M Riley¹, Amalia Aggeli, Rudolf J Koopmans

¹Astbury Centre for Structural Molecular Biology, Institute of Molecular and Cellular Biology, School of Chemistry, University of Leeds, Leeds LS2 9JT, UK.

Biotechnology and Bioengineering

|March 7, 2009

Summary

Researchers developed a cost-effective method to produce the self-assembling peptide P(11)-4 using Escherichia coli. This recombinant peptide forms pH-dependent hydrogels, advancing nanoscale materials for tissue engineering.

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Area of Science:

Biomaterials Science
Synthetic Biology
Nanotechnology

Background:

Peptide P(11)-4 self-assembles into beta-sheets and nematic gels in a specific pH range.
Its biocompatibility and biodegradability make it suitable for tissue engineering applications.
High cost of chemical synthesis limits large-scale peptide production.

Purpose of the Study:

To develop a scalable and cost-effective method for producing peptide P(11)-4.
To characterize the self-assembly properties of the recombinant peptide.
To explore its potential in nanoscale material fabrication.

Main Methods:

Expression of peptide P(11)-4 repeats in Escherichia coli using the pET31b+ vector.
Utilized auto-induction growth medium for enhanced protein expression.
Inclusion body recovery, cyanogen bromide cleavage, and reverse-phase HPLC for purification.

Main Results:

Successfully produced 2.5 g/L of fusion protein using auto-induction.
Purified recombinant peptide P(11)-4 (rP(11)-4(hsl)) was obtained.
Recombinant peptide demonstrated pH-dependent hydrogel formation, beta-structure, and fibril formation.

Conclusions:

Recombinant production in E. coli offers a scalable alternative to chemical synthesis for P(11)-4.
The purified peptide retains its self-assembly properties and potential for biomaterial applications.
This method facilitates the use of P(11)-4 in tissue engineering and nanotechnology.