Yeast Expression System for Vaccine Production

Expressing proteins in yeast often act as an alternative to bacterial expression system with both high yield and additional benefits of post-translational modifications as well as secretory expression. Usually, a product expressed in yeast is paralleled to the native protein. Furthermore, the species are easy to scale up to fermentation processes in simple and affordable cultivation conditions. Commonly used strains are Picchia pastoris, Saccharomyces cerevisiae, and occasionally Hensenula polymorpha. Creative Biolabs is at the forefront of protein expression with decades of experiences. Equipped with a team of professional scientists, we are capable of providing our clients with a variety of customized services from concept to product to meet all your needs.

Yeast – Creative Biolabs

Comparison of Expression systems

Characteristics E. coli Yeast Insect cells Mammalian cells
Growth speed rapid (30 min) rapid (90 min) slow (18-24 h) slow (24 h)
Expense of growth medium low low high high
Expression level high low-high low-high low-moderate
Secretory expression secretion to periplasm secretion to medium secretion to medium secretion to medium
Posttranslational modification
Protein folding refolding required refolding sometimes required suitable folding suitable folding
N-linked glycosulation none high mannose simple complex
Gamma-Carboxylation no no no yes
Phosphorylation no yes yes yes
Acetylation no yes yes yes
Acylation no yes yes yes
O-linked glycosulation no yes yes yes

At present, there are many expression systems in the world that can produce protein of interest. Each expression system has its own advantages. Although the principles and methods of operation of different expression systems vary widely, the process of obtaining target proteins for subsequent research is basically the same. The general flow of a protein production includes gene expression, posttranslational modifications, protein secretion and downstream processing, each of steps requiring detailed design. Creative Biolabs possess various yeast expression systems and diversified flexible strategies to meet your sundry requirements for protein production.

Protein Production Steps – Creative Biolabs

Saccharomyces cerevisiae Expression System

Saccharomyces cerevisiae is a species of yeast which is widely applied in winemaking, baking and brewing. The species is generally found on skins of grapes and other ripe fruits. Defined as a most studied eukaryotic model organism for protein production, S. cerevisiae has its own superiority to bacteria in posttranslational modifications and secretion, relieving the burden of purification and modification significantly. Besides, S. cerevisiae is easy to culture in low pH conditions as well as high sugar and ethanol concentrations, even could tolerate high osmotic pressure, all of which enable the species a desired tool for industrial fermentation.

Kluyveromyces lactis Expression System

Kluyveromyces lactis (the former Saccharomyces lactis) is a yeast of ability to assimilate lactose and transform it into lactic acid. After decades of research, the organism has been widely used in food industry due to its well-established merit of safety. After a transformation system was built in 1980s, K. lactis started to be applied for protein production as an expression host.

As an expression system, K. lactis has following advantages over other yeast, including:

  • Inexpensive culture conditions containing lactose
  • Well-developed genetics
  • High yield of product up to g/l scale
  • GRAS status
  • Secretory expression of high molecular weight proteins

Pichia pastoris Expression System

Pichia pastoris, a kind of methylotrophic yeast, is one of the most popular tools to generate recombinant protein with a success of large-scale productivity. P. pastoris was used to convert methanol into protein source for animal feed in the past, but today, it has been engineered to research cell biology as a model eukaryote and to produce recombinant protein. As a highly accepted system for protein expression, P. pastoris has its distinguished traits in following aspects:

  • Ability to grow to high cell densities
  • Robust inducible promoters
  • Ease of manipulation
  • Extra process to stabilize product
  • High production output
  • Secretory protein production
  • Requirements for precise fermentation conditions
  • Capable of multiple posttranslational modification
  • Demands of MetOH induction (necessary for explosive-safe fermentors)

Hansenula polymorpha Expression System

Hansenula polymorpha is one of the four methylotrophic yeasts, the other three species are Candida boidinii, Pichia methanolica, and Pichia pastoris. Along with Pichia pastoris, Hansenula polymorpha is of extensively application in protein expression. As H. polymorpha is much more thermostable than P. pastoris, thus having a potential in producing proteins studied for crystallology. The main features of H. polymorpha expression system are listed below:

  • Secretes proteins on certain conditions
  • Short fermentation times
  • High level expression and simple purification
  • Rarely hyper-glycosylation of the protein product
  • Thermotolerant
  • Capacity of high-copy integration
  • Free of toxins and viral contaminations.

Our Platforms of Yeast Expression System

  • Codon optimization and gene synthesis
  • A variety of well-established yeast strains and expressing vectors
  • Expression evaluation and optimization
  • Large-scale protein expression and subsequent processing
  • Process development and improvement

Creative Biolabs is a leader in the field of vaccine development and has extensive experiences in protein expressing for decades. We are furnished with a professional team expertized in protein production, aiming at providing you with the most complete service. If any interests you have in our services, please do not be hesitate to contact us for more details.


Our services are for research use only. We do not provide services directly to individuals.


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