De Novo Chlorophyll Special Pair Proteins for Dimer Geometry
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Solution Overview
Problem
Existing methods struggle to systematically assemble chlorophyll dimers with predefined geometries that precisely match special pair geometries, hindering the development of synthetic biology for efficient solar-to-fuel energy conversion.
Innovation Solution
Design and synthesis of de novo chlorophyll special pair proteins with specific amino acid sequences that can bind to chlorophyll dimers, forming homodimers and scaffolds, and potentially incorporating functional domains for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If natural photosystems are used to study chlorophyll special pairs, then the native structure and function are preserved, but the complexity of natural photosystems makes it difficult to study these Chls directly
Solution Approach 1:
The patent extracts and isolates the chlorophyll special pair from the complex natural photosystem context, creating simplified de novo designed proteins that contain only the essential chlorophyll binding functionality. This allows study of special pair properties without the complicating factors of complete photosystem complexes.
Solution Approach 2:
The patent segments the complex photosystem into minimal functional units by designing proteins that bind only the chlorophyll special pair, separating the chlorophyll binding function from other photosystem components for independent study and optimization.
2Device complexity
If small molecule mimics of special pairs are used, then the structure is simplified, but they are labor-intensive to synthesize and overlook the role of protein matrix effects
Solution Approach 1:
The patent employs de novo protein design where the protein structure self-assembles to create the precise chlorophyll binding geometry, eliminating the need for labor-intensive chemical synthesis of complex small molecule mimics while maintaining structural precision.
Solution Approach 2:
The patent changes the approach from chemical synthesis of small molecules to biological synthesis of proteins, utilizing the protein's three-dimensional structure to precisely position chlorophyll molecules, thereby simplifying manufacturing while maintaining and enhancing structural precision.
3Ease of manufacture
If small molecule mimics are used, then synthesis is avoided, but they lack the fine control over Chl-Chl distances and orientations needed to reproduce the precise geometries of native special pairs
Solution Approach 1:
The patent replaces chemical synthesis methods with protein-based structural control, where the three-dimensional protein fold mechanically positions chlorophyll molecules with atomic-level precision, achieving superior control over Chl-Chl distances and orientations compared to small molecule approaches.
Solution Approach 2:
The patent creates a composite system where the protein matrix and chlorophyll molecules work together, with the protein's structured environment providing precise geometric control over the chlorophyll arrangement, achieving native-like special pair geometries that small molecule mimics cannot replicate.
4Manufacturing precision
If de novo designed proteins are created to bind chlorophyll dimers, then precise control over Chl-Chl distances and orientations is achieved, but no structures of Chl dimers in designed proteins have been determined experimentally
Solution Approach 1:
The patent employs iterative design-refinement cycles where computational models are continuously improved based on experimental feedback from X-ray crystallography and spectroscopy, allowing the structure to be refined to match the designed geometry with increasing precision in each iteration.
Solution Approach 2:
The patent performs extensive computational modeling and simulation before experimental structure determination, pre-optimizing the protein-chlorophyll complex geometry to guide subsequent experimental work and ensure the desired structure can be achieved and validated.
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 designed proteins enable precise control over chlorophyll-chlorophyll distances and orientations, enhancing light harvesting and charge separation efficiency, suitable for energy transfer and conversion technologies.
Implementation Method 1
the polypeptide binds to a chlorophyll (Chl) dimer
Implementation Method 2
Photosynthetic proteins manipulate the distances and angles between chlorophyll (Chl) molecules to tune excitonic coupling and control absorption and fluorescence spectra
Implementation Method 3
Photosynthetic proteins manipulate the distances and angles between chlorophyll (Chl) molecules to tune excitonic coupling and control absorption and fluorescence spectra, excited state dynamics, energy transfer
Data Source
AI summary
Polypeptides are provide having an amino acid sequence at least 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% identical to the amino acid sequence selected from the group consisting of SEQ ID NO:1-17, wherein the polypeptide binds to a chlorophyll (Chl) dimer, and scaffolds thereof.