Yarrowia lipolytica Polypeptide Secretion via Acid Protease Signal
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Solution Overview
Problem
Current expression systems, particularly Saccharomyces cerevisiae, face limitations such as low heterologous protein production and hyperglycosylation, necessitating the exploration of alternative yeast species like Yarrowia lipolytica for mammalian-like post-translational modifications and efficient polypeptide production in biotechnological applications.
Innovation Solution
A genetic construct for Yarrowia lipolytica incorporating an acid extracellular protease secretion signal sequence and flanking zeta sequence recombination sites is developed, enabling the expression and secretion of polypeptides into the extracellular space or onto the cell wall, utilizing a plasmid-based expression vector with specific restriction enzyme sites for integration and transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Saccharomyces cerevisiae is used as the expression system, then the system is well-established and easy to operate, but heterologous protein production is low and hyperglycosylation occurs
Solution Approach 1:
The patent extracts the expression system from the conventional S. cerevisiae to Y. lipolytica, which naturally produces lower levels of hyperglycosylation and allows for improved heterologous protein production while maintaining ease of operation through well-established yeast transformation protocols
Solution Approach 2:
The patent changes the biological parameters of the expression system by switching from S. cerevisiae to Y. lipolytica, which has different glycosylation patterns and protein secretion capabilities, thereby improving both productivity and product quality
2Ease of operation
If Saccharomyces cerevisiae is used as the expression system, then the system is well-established and easy to operate, but hyperglycosylation of recombinant proteins occurs
Solution Approach 1:
The patent extracts the expression system from S. cerevisiae to Y. lipolytica, which has a more mammalian-like glycosylation profile and produces less hyperglycosylation, thereby improving the accuracy of post-translational modifications while maintaining ease of operation
Solution Approach 2:
The patent changes the biological parameters of the expression system by switching to Y. lipolytica, which naturally performs more accurate mammalian-like post-translational modifications, reducing hyperglycosylation artifacts
3Productivity
If Yarrowia lipolytica is used as the expression system, then mammalian-like post-translational modifications are achieved and protein production is improved, but the system requires development of specific genetic constructs
Solution Approach 1:
The patent performs preliminary actions by developing and optimizing the genetic construct components (promoters, secretion signals, integration sites) for Y. lipolytica before full-scale protein production, thereby simplifying subsequent expression operations
Solution Approach 2:
The patent uses specific genetic elements as intermediaries, such as the acid extracellular protease secretion signal sequence and zeta sequence recombination sites, which mediate between the introduced polypeptide gene and the Y. lipolytica expression machinery
Data Source
AI summary
The present invention relates to the expression of polypeptides using Yarrowia lipolytica, in particular the secretion of expressed polypeptides into either the extracellular space or the surface of the Y. lipolytica host cell wall. The invention also extends to the use of the polypeptides so expressed in biotechnological applications. The present invention provides an expression construct for the expression of polypeptides using at least a single Yarrowia lipolytica yeast cell, the expression construct having at least one expression cassette, the expression cassette including an acid extracellular protease secretion signal sequence and flanking zeta sequence recombination sites.