Corynebacterium Promoter Expression Units
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Solution Overview
Problem
Current methods for improving the production of fine chemicals and proteins in Corynebacterium species, such as Corynebacterium glutamicum, are limited in their ability to regulate gene expression effectively, particularly in terms of transcription and translation rates, which affects productivity and yield.
Innovation Solution
The use of novel nucleic acid sequences with promoter activity, including the superoxide dismutase promoter sequence from Corynebacterium glutamicum, and expression units to regulate gene transcription and translation, allowing for increased or decreased expression rates based on specific conditions, thereby enhancing the production of biosynthetic products like amino acids, vitamins, and enzymes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to improve production of fine chemicals and proteins, then productivity and yield are limited, but implementing new nucleic acid sequences and expression units increases device complexity
Solution Approach 1:
The patent applies parameter changes by modifying nucleic acid sequences (promoters and ribosome binding sites) to alter their functional properties. Specifically, the invention identifies and modifies conserved regions within promoter sequences and RBS elements to create variants with enhanced transcriptional and translational activity, thereby increasing productivity without fundamentally changing the system architecture
Solution Approach 2:
The patent employs composite materials by combining optimized promoter sequences with optimized ribosome binding site sequences to create hybrid expression units. These composite expression cassettes integrate multiple functional elements (promoter, RBS, coding sequence) that work synergistically to achieve superior gene expression levels compared to individual components alone
2Productivity
If gene expression is increased to enhance productivity, then transcription and translation rates improve, but control precision over expression timing and levels deteriorates
Solution Approach 1:
The patent applies dynamics by creating inducible expression systems where gene expression can be dynamically controlled in response to environmental signals. The modified promoters and RBS elements respond to specific inducers (such as metal ions or chemical compounds), allowing transcription and translation rates to be adjusted in real-time during the fermentation process, thus maintaining both high productivity and precise temporal control
Solution Approach 2:
The patent implements feedback mechanisms through the design of expression units that respond to cellular metabolic states. The modified regulatory sequences can sense intracellular conditions (such as metabolite concentrations or redox state) and adjust expression levels accordingly, creating a self-regulating system that maintains optimal productivity while preventing metabolic imbalances
3Productivity
If novel nucleic acid sequences are introduced to regulate gene expression, then expression rates increase, but the difficulty of detecting and measuring expression levels increases
Solution Approach 1:
The patent applies the intermediary principle by introducing reporter genes (such as GFP, luciferase, or β-galactosidase) that are co-expressed with or fused to the target genes under the control of the modified promoters and RBS elements. These reporter proteins serve as measurable intermediaries that correlate with the expression levels of the biosynthetic genes, enabling indirect but accurate quantification of transcription and translation rates through standard assays
Data Source
AI summary
The present invention relates to the use of nucleic acid sequences for regulating the transcription and expression of genes, the novel promoters and expression units themselves, methods for altering or causing the transcription rate and/or expression rate of genes, expression cassettes comprising the expression units, genetically modified microorganisms with altered or caused transcription rate and/or expression rate, and methods for preparing biosynthetic products by cultivating the genetically modified microorganisms.