Indigoidine Production via Sc-IndB and Sc-IndC Co-expression
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Solution Overview
Problem
Conventional methods for producing indigoidine result in limited production, hindering its industrial use despite its promising utilities.
Innovation Solution
An expression system is developed for co-expressing Sc-IndB and Sc-IndC proteins in a heterologous host cell, utilizing DNA sequences encoding these proteins on vectors or integrated into the host genome, along with a sfp gene or PPTase for enhanced indigoidine production and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used for indigoidine production, then the production process is simple, but the yield is limited
Solution Approach 1:
The indigoidine biosynthetic pathway is segmented into distinct genetic components (indB, indC, sfp genes) that are separately cloned and expressed. This segmentation allows for optimized expression of each enzyme component, leading to improved overall productivity while maintaining manageable system complexity through modular construction.
Solution Approach 2:
A heterologous host organism serves as an intermediary system to express the indigoidine biosynthetic genes. The host provides the cellular machinery for protein expression and metabolism, mediating between the genetic blueprint and the production of indigoidine, thereby achieving high yield without requiring complex industrial fermentation setups.
2Quantity of substance
If conventional production methods are used, then the process is economical, but the production volume is insufficient for industrial use
Solution Approach 1:
The biosynthetic genes are pre-cloned into expression vectors and introduced into the heterologous host before large-scale production. This preliminary genetic preparation establishes a high-yielding production strain that can be scaled up using standard fermentation techniques, thereby achieving industrial production volumes while maintaining ease of manufacture through conventional bioprocessing.
Solution Approach 2:
The expression levels of indB, indC, and sfp genes are optimized by adjusting promoter strength, ribosome binding sites, and gene copy number in the expression vectors. These parameter changes maximize the production volume of indigoidine while keeping the manufacturing process simple and scalable.
3Productivity
If indigoidine is produced at high yield, then industrial use becomes feasible, but the extraction and purification process becomes more complex
Solution Approach 1:
The indigoidine pigment is selectively extracted from the fermentation broth using organic solvents that specifically dissolve the pigment while leaving other cellular components in the aqueous phase. This targeted extraction simplifies the purification process by separating the high-value product from the complex fermentation mixture in a single efficient step.
Solution Approach 2:
The deep blue color of indigoidine serves as a visual indicator for monitoring production and guiding the extraction process. The color change properties of indigoidine under different pH conditions and solvent environments are exploited to facilitate purification, allowing for simple visual assessment of product quality and purity without complex analytical instrumentation.
Data Source
AI summary
The present disclosure provides for an expression system for the production of blue pigment indigoidine. The system comprises a heterologous host cell, a DNA sequence encoding a Sc-IndB protein, and a DNA sequence encoding a Sc-IndC protein. The system may be configured for the co-expression of the Sc-IndB and Sc-IndC. DNA sequences encoding the Sc-IndB and Sc-IndC may be provided on at least one vector. Alternatively, the DNA sequences encoding the Sc-IndB and Sc-IndC may optionally be integrated into the genome of the heterologous host genome. The expression system may further comprise a sfp gene or a PPTase.