Synthetic Operon Design for Uniform Bacterial Microcompartment Shells
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Solution Overview
Problem
Current methods lack a general approach for producing synthetic microcompartment shells and integrating molecules into these structures, limiting the ability to engineer new metabolic pathways and enhance metabolic activity in organisms.
Innovation Solution
The development of constructs and systems for producing microcompartments and microcompartment shells using synthetic operons, which include specific ordering of genes and ribosomal binding sites to control expression, allowing for the incorporation of proteins into these shells through peptide tag sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If natural BMC gene clusters are used for microcompartment production, then the shells can be formed with natural protein composition, but the production yield and uniformity are insufficient due to variable gene arrangement and composition
Solution Approach 1:
The shell protein genes are segmented into three distinct types (BMC-H hexamers, BMC-T tandem domains, and BMC-P pentamers) with specific gene arrangements. This segmentation allows precise control over protein expression ratios and shell assembly, resulting in uniform microcompartment structures with consistent size and morphology.
Solution Approach 2:
The invention optimizes specific parameters including gene copy numbers, ribosomal binding site sequences, and promoter strengths to control the expression levels of different shell proteins. By adjusting these parameters, the system achieves high-yield production of uniform microcompartments with desired shell composition and structure.
2Manufacturing precision
If synthetic operons with controlled expression are used, then shell protein expression can be optimized for uniformity and yield, but the system complexity increases due to engineered gene clusters
Solution Approach 1:
The synthetic operon system is designed as a universal platform that can be applied to produce different types of microcompartments by simply changing the shell protein gene sequences while maintaining the same operational structure. The standardized operon design with modular components (promoters, RBS sequences, gene clusters) allows easy adaptation for various applications despite the inherent complexity of the engineered system.
3Adaptability or versatility
If molecules are integrated into microcompartment shells, then new metabolic pathways can be engineered, but the difficulty of detecting and measuring integration increases
Solution Approach 1:
The invention incorporates fluorescent protein tags (such as GFP) into the shell protein structures to enable visual detection and measurement of microcompartment formation and molecule integration. These color-changing markers allow researchers to easily monitor and quantify the successful integration of enzymes and other molecules into the shells through fluorescence microscopy and spectroscopy.
Data Source
AI summary
To produce a bacterial microcompartment shell, or a designed shell based on naturally occurring bacterial microcompartment shells in a new host organism, a synthetic operon is constructed that contains the desired shell protein genes and translation efficiency is controlled by host specific ribosomal binding sites. Proteins or other molecules can be encapsulated in the microcompartment shells by various methods described herein. The constructs can also be used to express self-assembling sheets comprised of shell proteins.