Pichia pG1-x Promoter Variants for Higher Induction Ratio
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Solution Overview
Problem
Existing carbon source regulatable promoters in Pichia pastoris, such as the pG1 promoter, have limitations in promoter strength and induction ratio, which affect the efficiency and time required for protein production.
Innovation Solution
Development of a functional variant pG1-x promoter with specific mutations and regulatory regions, including core and non-core regulatory regions, enhancing promoter strength and induction ratio by at least 1.1-fold compared to the pG1 promoter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pG1 promoter is used for protein production, then carbon source regulation is achieved, but promoter strength and induction ratio are limited
Solution Approach 1:
The patent applies parameter changes by modifying the promoter sequence to create variants with altered transcriptional activity. Specifically, mutations in transcription factor binding sites (such as changing AT-rich sequences to TA-rich sequences) and modifications to core promoter elements (TATA box, BRE elements) are introduced to enhance promoter strength and induction ratio, thereby increasing protein production efficiency and reducing production time while maintaining carbon source regulatability
2Productivity
If promoter strength is increased, then protein production efficiency improves, but induction ratio may be compromised
Solution Approach 1:
The patent applies local quality by making specific localized modifications to different regions of the promoter. The core promoter region contains mutations that enhance basal transcriptional activity and promoter strength, while the upstream regulatory region contains modified transcription factor binding sites that maintain or enhance carbon source responsiveness. This localized optimization allows the promoter to simultaneously achieve high protein production efficiency and reliable induction ratio
Data Source
AI summary
An isolated and/or artificial pG1-x promoter, which is a functional variant of the carbon source regulatable pG1 promoter of Pichia pastoris identified by SEQ ID 1, which pG1-x promoter consists of or comprises at least a part of SEQ ID 1 with a length of at least 293 bp, characterized by the following promoter regions:a) at least one core regulatory region comprising the nucleotide sequences SEQ ID 2 and SEQ ID 3; andb) a non-core regulatory region, which is any region within the pG1-x promoter sequence other than the core regulatory region;wherein the pG1-x promoter comprises at least one mutation in any of the promoter regions and a sequence identity of at least 80% in SEQ ID 2 and SEQ ID 3, and a sequence identity of at least 50% in any region other than SEQ ID 2 or SEQ ID 3; and furtherwherein the pG1-x promoter is characterized by the same or an increased promoter strength and induction ratio as compared to the pG1 promoter, whereinthe promoter strength is at least 1.1-fold increased in the induced state as compared to the pG1 promoter, and/orthe induction ratio is at least 1.1-fold increased as compared to the pG1 promoter.