Recombinant Microalgae Chloroplast Transformation for Peptide Production
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Solution Overview
Problem
Current recombinant protein production systems, such as E. coli, face challenges in expressing recombinant peptides and proteins with native conformation, high purity, and stability due to limitations in post-translational modifications, leading to poor solubility and activity, while microalgae offer advantages like low nutrient requirements and GRAS status, but require improvement in chloroplast transformation efficiency for high-yield protein production.
Innovation Solution
The method involves transforming microalgae chloroplast genomes with nucleic acid sequences encoding the KTTKS peptide or its derivatives, utilizing endogenous disulfide bond formation to enhance protein stability and accumulation, and secreting recombinant proteins outside the cell for simplified purification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If E. coli is used for recombinant protein production, then productivity is high, but manufacturing precision deteriorates due to lack of post-translational modifications
Solution Approach 1:
The patent changes the host organism from E. coli to microalgae, fundamentally altering the biological parameter of the expression system. This enables proper post-translational modifications while maintaining high productivity, as microalgae possess the necessary enzymatic machinery for disulfide bond formation and glycosylation that E. coli lacks.
Solution Approach 2:
The patent uses chloroplast transformation to introduce and express recombinant genes in microalgae. The chloroplast genome serves as a stable platform to copy and maintain the recombinant DNA sequence, ensuring consistent protein production with proper folding and modification.
2Manufacturing precision
If chloroplast transformation is used in microalgae, then manufacturing precision improves for protein conformation, but productivity is limited by low transformation efficiency
Solution Approach 1:
The patent optimizes transformation parameters by using specific microalgal strains with enhanced chloroplast transformation efficiency. It also adjusts the recombinant protein coding sequence parameters (codon optimization, promoter strength) to maximize protein accumulation while maintaining proper conformation.
Solution Approach 2:
The patent exploits the natural capability of microalgae to secrete recombinant proteins outside the cell into the culture media. This self-secretion mechanism simplifies purification and increases effective productivity, as the protein is directly available in the extracellular environment without requiring complex intracellular extraction.
3Adaptability or versatility
If repeat sequence DNA is introduced into microalgae, then adaptability improves for producing specific peptides, but reliability deteriorates due to genetic recombination and instability
Solution Approach 1:
The patent introduces the repeat sequence DNA into the chloroplast genome rather than the nuclear genome. The chloroplast genome has a different recombination mechanism that is more stable for repeat sequences. This local placement provides genetic stability while still allowing the specific peptide sequence to be expressed.
Solution Approach 2:
The patent uses a transformation vector with a stable backbone and controlled replication origin to deliver the repeat sequence DNA. The vector is designed to integrate stably into the chloroplast genome, preventing premature recombination or degradation of the repeat sequence before protein production begins.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases the accumulation, stability, and solubility of recombinant peptides and proteins in microalgae, overcoming the limitations of traditional systems and enabling their use in cosmetic applications with improved biological effects on skin extracellular matrix molecules like collagen.
Implementation Method 1
utilizing endogenous disulfide bond formation to enhance protein stability and accumulation
Implementation Method 2
secreting recombinant proteins outside the cell for simplified purification
Data Source
AI summary
The present invention concerns a recombinant microalgae comprising a nucleic acid sequence encoding a recombinant peptide of KTTKS (SEQ ID N°1); a recombinant peptide, polypeptide or protein consisting in repeated units of SEQ ID N°1; or a derivative thereof, said nucleic acid sequence being located in the chloroplast genome of microalgae. It also relates to a method for producing a recombinant peptide of SEQ ID N°1; a recombinant peptide, polypeptide or protein consisting in repeated units of SEQ ID N°1; or a derivative thereof, wherein said method comprises the chloroplast genome transformation of a microalgae with a nucleic acid sequence encoding said recombinant protein, polypeptide or peptide. It further relates to the use of said recombinant peptide, polypeptide or protein for the cosmetic industry.