Metal Complex Catalysts for Rubisco CO2 Concentration
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Solution Overview
Problem
Photosynthesis in plants and photosynthetic organisms is inefficient, with enzymes like rubisco being slow and prone to photorespiration, limiting crop growth and yield improvement.
Innovation Solution
Use of metal complexes with specific ligand structures to enhance carbon dioxide concentration around rubisco, favoring the dehydration reaction and improving photosynthetic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If natural photosynthesis is used in crops, then the process is simple and requires no external intervention, but the efficiency is low (1-2%) due to slow rubisco activity and photorespiration
Solution Approach 1:
The patent introduces metal complexes as intermediary catalysts that mediate the carbon fixation process. These complexes provide alternative catalytic pathways that are more efficient than natural rubisco, acting as mediators between CO2 and organic compounds to enhance photosynthetic efficiency without fundamentally changing the photosynthesis process
Solution Approach 2:
The patent changes the catalytic parameters of the carbon fixation system by introducing metal complexes with specific ligands (porphyrin, chlorin, or corrin structures) that alter the reaction kinetics and efficiency. This modifies the catalytic rate and specificity without requiring genetic modification of the plant
2Productivity
If carbon concentrating mechanisms are used to improve photosynthetic activity, then CO2 concentration around rubisco increases, but this requires additional enzymes and transporters that increase system complexity
Solution Approach 1:
The metal complexes serve as intermediary catalysts that facilitate CO2 concentration and fixation without requiring the complex enzyme systems of natural carbon concentrating mechanisms. The complexes directly catalyze the conversion of CO2 to organic compounds, simplifying the overall system while maintaining high carbon fixation rates
3Productivity
If synthetic metal complexes are used to catalyze carbon dioxide hydration, then CO2 conversion to HCO3 is enhanced, but the complexes must be designed with specific ligands to achieve the desired catalytic activity and specificity
Solution Approach 1:
The patent segments the metal complex into distinct functional components: the metal center (Fe, Co, Ni, Cu, or Zn) and the organic ligand (porphyrin, chlorin, or corrin). This segmentation allows for independent optimization of each component's properties and simplifies the synthesis process by enabling modular assembly of the complex structure
Solution Approach 2:
The patent systematically varies the metal center and ligand parameters to optimize catalytic activity. By changing the metal ion and ligand structure parameters, the complexes achieve different catalytic specificities and activities for CO2 hydration, allowing tuning of the reaction parameters to match biological requirements
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
Increases rubisco activity and photosynthetic efficiency, leading to enhanced crop growth and yield without the need for genetically modified organisms.
Implementation Method 1
The metal complex comprises a metal selected from the group consisting of zinc (Zn), cobalt (Co), copper (Cu), nickel (Ni) and iron (Fe). The metal complex further comprises a bidentate or tridentate ligand... Synthetic metal complexes can catalyse the production of carbon dioxide by shifting the equilibrium shown in equation (1) above to the left.
Implementation Method 2
CA is the enzyme that catalyses the reversible interconversion between CO2 and HCO3
Implementation Method 3
CA is the enzyme that catalyses the reversible interconversion between CO2 and HCO3, as shown in equation (1) below.
Implementation Method 4
The enzyme ribulose-1,5-biphosphate carboxylase/oxygenase (RuBisCO; referred to herein as 'rubisco') catalyses the integration of CO2 into organic carbon for biomass
Implementation Method 5
Rubisco is one of the slowest known enzymes with a typical catalytic rate of 3 to 10 molecules per second. It is also highly unspecific to CO2.
Implementation Method 6
Plants rely on photosynthesis to convert light energy into chemical energy, which is used to make cellulose for cell walls and proteins for growth and repair.
Data Source
AI summary
A method of promoting growth in a photosynthetic organism comprising treating the photosynthetic organism with a metal complex or a precursor thereof, wherein the metal complex comprises a metal selected from the group consisting of zinc (Zn), cobalt (Co), copper (Cu), nickel (Ni) and iron (Fe), and a ligand, which is a bidentate or tridentate ligand. Metal complexes and their ligands are also describe.