Engineered Polypeptides for Methane Oxidation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current biological systems struggle to express soluble methane monooxygenase (sMMO) or particulate MMO (pMMO) in industrially relevant host organisms, limiting the development of biological gas-to-liquid technology for methane conversion, resulting in significant methane wastage, especially in remote natural gas production sites.
Innovation Solution
Engineered soluble polypeptides with improved solubility and stability, such as spmoB variants, are designed and expressed in E. coli, capable of oxidizing methane to methanol without the need for in vitro refolding or metal loading, using computational protein design strategies and linker optimization to enhance expression yields and activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional sMMO or pMMO systems are used for methane oxidation, then methane conversion capability is achieved, but the ability to express in industrially relevant host organisms is lost
Solution Approach 1:
The pmoB gene encoding particulate methane monooxygenase is divided into two separate domains (N-terminal domain and C-terminal domain) that can be independently expressed. These domains are then reconstituted to form the functional enzyme complex, enabling expression in host organisms while maintaining solubility and activity.
Solution Approach 2:
A soluble linker peptide is introduced as an intermediary between the N-terminal and C-terminal domains of pmoB. This linker mediates the interaction between domains, facilitating proper folding and assembly of the soluble MMO complex while maintaining expression capability in host organisms.
2Productivity
If engineered polypeptides are designed for improved solubility, then expression levels increase, but structural complexity increases
Solution Approach 1:
The amino acid sequence parameters of the pmoB domains and linker are optimized to enhance solubility and expression yield. Specific mutations and sequence modifications are introduced to improve folding efficiency and reduce aggregation, thereby increasing productivity while managing structural complexity.
3Reliability
If computational protein design strategies are used, then activity and solubility are improved, but design complexity increases
Solution Approach 1:
Computational protein design and in silico modeling are performed beforehand to predict optimal domain structures, linker sequences, and folding pathways. This preliminary computational analysis guides the experimental design, reducing trial-and-error and improving first-success rates for achieving desired activity and solubility.
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 engineered polypeptides achieve high expression levels and activity, enabling efficient methane conversion to methanol, potentially reducing capital expenditures and methane wastage by facilitating biofuel production and other oxidation chemistries.
Implementation Method 1
soluble, polypeptides capable of oxidizing methane to methanol (e.g., hydroxylation) are provided
Implementation Method 2
the polypeptide is capable of converting methane into methanol
Data Source
AI summary
Provided herein are soluble engineered polypeptides for oxidizing hydrocarbons, and methods of use, manufacture, and design thereof. In particular, soluble, polypeptides capable of oxidizing methane to methanol (e.g., hydroxylation) are provided.