Modified Rubisco Activase Thermal Stability

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Solution Overview

Problem

Rubisco activase, a crucial enzyme for plant photosynthesis, is thermally unstable, leading to reduced CO2 assimilation and plant growth efficiency, especially under elevated temperatures associated with global warming, necessitating a heat-stable alternative.

Innovation Solution

A modified rubisco activase with increased melting temperature, achieved through point mutations in the AAA+ domain, such as M135R, M163I, and V262I, enhancing its thermal stability and maintaining ATP hydrolysis function.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If wild type rubisco activase is used, then the enzyme can perform ATP hydrolysis and activate rubisco at optimal temperatures, but it loses stability and function at elevated temperatures

Engineering Contradiction:

Improvethermal stabilityVSAvoidCO2 assimilation efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent applies parameter changes by introducing point mutations at specific amino acid positions (135, 163, and 262) in the AAA+ domain of rubisco activase. These mutations alter the physical-chemical parameters of the protein structure, increasing the melting temperature from approximately 30.4°C to above 46.0°C, thereby enhancing thermal stability while preserving catalytic function

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite enzyme structure by combining multiple mutant variants (M135R, M163I, V262I) within the same protein sequence. This composite approach integrates the stabilizing effects of multiple mutations to achieve synergistic thermal stability enhancement while maintaining ATP hydrolysis capability

Inventive Principle:

Principle #40Composite materials

2Temperature

If point mutations are introduced to increase melting temperature, then thermal stability is enhanced, but there is a risk of compromising ATP hydrolysis function

Engineering Contradiction:

Improvemelting temperatureVSAvoidATP hydrolysis function

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent applies local quality by introducing mutations only in specific regions (AAA+ domain at positions 135, 163, and 262) rather than throughout the entire protein. This localized modification approach enhances thermal stability in critical regions while preserving the functional integrity of other domains responsible for ATP hydrolysis

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The mutated rubisco activase maintains its ability to self-regulate ATP hydrolysis and rubisco activation. The enzyme's intrinsic catalytic mechanisms remain intact despite structural modifications, allowing it to autonomously perform its biochemical functions at elevated temperatures

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If heat stable rubisco activase is developed, then plant growth can be maintained under global warming conditions, but the complexity of enzyme engineering increases

Engineering Contradiction:

Improveheat toleranceVSAvoidenzyme modification complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the rubisco activase protein into functional domains, focusing modifications specifically on the AAA+ domain where mutations 135, 163, and 262 are introduced. This segmentation allows targeted engineering of thermal stability without complicating the entire enzyme structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of attempting to stabilize the entire rubisco activase molecule through extensive modifications, the patent inverts the approach by making minimal, targeted changes to specific residues. This inversion simplifies the engineering process while achieving the desired heat tolerance through clever, localized sequence modifications

Inventive Principle:

Principle #13The other way round (Inversion)

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

The modified rubisco activase exhibits significantly higher thermal stability, improving CO2 assimilation and plant growth performance even at higher temperatures, addressing the limitations of wild-type rubisco activase.

Implementation Method 1

A modified rubisco activase with increased melting temperature, achieved through point mutations in the AAA+ domain, such as M135R, M163I, and V262I, enhancing its thermal stability

Methodology Applied

Scientific EffectThermal stability enhancement through protein engineering:

Implementation Method 2

maintaining ATP hydrolysis function

Methodology Applied

Scientific EffectATP hydrolysis: Hydrolysis

Data Source

PatentUS10487368B2Stabilization of rubisco activase for enhanced photosynthesis and crop yields

Publication Date: 2019.11.26 UCHICAGO ARGONNE LLC

AI summary

A modified rubisco activase, wherein the modified rubisco activase has a melting temperature greater than that of wild type rubisco activase. Further aspects of the disclosure relate to an isolated polynucleotide encoding a modified rubisco activase and a recombinant expression system comprising the isolated polynucleotide. Still further aspects of the disclosure relate to a plant cell transfected with the recombinant expression system. Certain aspects of the disclosure relate to a genetically modified plant expressing the isolated polynucleotide encoding a modified rubisco activase.