Lemnaceae Expression Control Elements for Duckweed Protein Production

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Solution Overview

Problem

There is a need for optimized compositions and methods to enhance gene expression in duckweed plants for protein production, as existing systems face challenges in achieving high levels of expression and scalability for commercial applications.

Innovation Solution

The use of novel nucleotide sequences for expression control elements isolated from the Lemnaceae ubiquitin gene, including promoters and introns, and a Lemnaceae chitinase signal peptide to regulate transcription and direct extracellular secretion of polypeptides in duckweed plants, facilitating the creation of expression constructs and transformed plants for efficient protein production.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing microbial or cell culture systems are used for protein production, then protein production capability is achieved, but post-translational processing similar to mammalian cells is lacking and scalability is limited

Engineering Contradiction:

Improvebiologically active protein productionVSAvoidpost-translational processing capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the biological system parameters by transitioning from microbial systems to plant-based duckweed systems, which naturally possess mammalian-like post-translational processing capabilities. This parameter change enables the production of biologically active proteins that require complex modifications while maintaining rapid growth and scalability characteristics.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If duckweed biomass is scaled up for commercial production, then production volume increases, but expression levels of target proteins remain insufficient

Engineering Contradiction:

Improvebiomass accumulation rateVSAvoidprotein expression level

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The patent applies preliminary action by optimizing the expression cassette design before scale-up, including selecting strong promoters, optimizing coding sequences for duckweed codon usage, and incorporating appropriate signal sequences. This preliminary optimization ensures high expression levels are achieved even at large biomass scales, resolving the contradiction between production volume and protein expression level.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes multiple parameters including promoter strength, codon optimization, and expression cassette structure to simultaneously achieve high biomass accumulation and high protein expression levels in duckweed systems for commercial production.

Inventive Principle:

Principle #35Parameter changes

3Quantity of substance

If complex expression control elements are used to enhance protein expression, then expression levels increase, but system complexity and cost increase

Engineering Contradiction:

Improveprotein expression levelVSAvoidexpression system complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent employs universal expression control elements from duckweed that can drive high-level expression of diverse target proteins. The selected promoters and regulatory elements are designed to be broadly applicable across different protein production scenarios, reducing the need for protein-specific optimization and thereby simplifying the overall system while maintaining high expression levels.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 enables high-level expression of polypeptides in duckweed plants, overcoming limitations of microbial systems by providing a fast, cost-efficient, and scalable method for producing biologically active proteins, suitable for commercial production and research applications.

Implementation Method 1

The expression control elements of the invention initiate transcription of operably linked heterologous nucleotide sequences in plants

Methodology Applied

Scientific EffectTranscription:

Implementation Method 2

The signal peptide-encoding sequence can be operably linked to a coding sequence for a polypeptide of interest to direct extracellular secretion of the encoded polypeptide

Methodology Applied

Scientific EffectSecretion:

Data Source

PatentEP1973935B1Expression control elements from the lemnaceae family

Publication Date: 2012.10.10 BYONDIS BV

AI summary

Compositions and methods for regulating expression of nucleotide sequences of interest in a plant are provided. Compositions include novel nucleic acid molecules, and variants and fragments thereof, for expression control elements isolated from the Lemnaceae ubiquitin, r-histone and chinatase genes. A method for expressing a nucleotide sequence of interest in a plant using the expression control elements disclosed herein is further provided. Also provided is a novel Lemnaceae signal peptide-encoding sequence and the signal peptide encoded thereby. Where an expression construct of the invention is designed to express a polypeptide of interest, this novel signal peptide-encoding sequence can be included within the expression construct of the invention to provide for extracellular secretion of the encoded polypeptide of interest.