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Updated: Jul 18, 2026
09:46
Expression of Recombinant Proteins in the Methylotrophic Yeast Pichia pastoris
Published on: February 25, 2010
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Food proteins from yeast-based precision fermentation: Simple purification of recombinant β-lactoglobulin using
L J G Hoppenreijs1, A Annibal2, G J C Vreeke3
1Laboratory of Food Process Engineering, Wageningen University & Research, Bornse Weilanden 9, 6708 WG Wageningen, the Netherlands.
Food Research International (Ottawa, Ont.)
|January 1, 2024
Summary
A new, cost-effective method uses hexametaphosphate (HMP) to purify yeast-produced proteins. This simple precipitation technique enhances protein purity without affecting its structure or function, offering a viable alternative to chromatography for food applications.
Area of Science:
- Biotechnology
- Food Science
- Biochemistry
Background:
- Precision fermentation produces proteins requiring purification, often via chromatography.
- Current purification methods can be slow and expensive, especially for food applications.
- There is a need for efficient and economical protein purification strategies.
Purpose of the Study:
- To develop a simple, cost-effective purification method for yeast-expressed proteins.
- To evaluate the efficacy of hexametaphosphate (HMP) precipitation for protein purification.
- To assess the impact of the purification method on protein structure and functionality.
Main Methods:
- Utilized food-grade hexametaphosphate (HMP) for protein precipitation at acidic pH.
- Re-solubilized the protein-HMP complex via neutralization.
- Separated excess HMP using calcium chloride precipitation.
- Purified beta-lactoglobulin from Pichia pastoris as a model protein.
Main Results:
- Increased protein content from 26 wt% to 72 wt%, comparable to anion exchange chromatography.
- Reduced impurities to 9 wt% extracellular polysaccharides and 1 wt% HMP.
- Preserved the structural and functional properties of the purified protein, including emulsion formation.
- Demonstrated effective separation of target protein from yeast-derived polysaccharides.
Conclusions:
- Hexametaphosphate (HMP) precipitation offers a simple and effective purification method for yeast-produced proteins.
- This method is cost-effective and suitable for food applications.
- The technique maintains protein integrity and functionality, presenting a promising alternative to traditional chromatography.
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