Viscous PHA Copolymer Production via Mutant PHA Polymerase
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Solution Overview
Problem
Conventional polyhydroxyalkanoates (PHAs) are limited in variety, and viscous PHAs have not been reported, limiting their applications in biodegradable packaging materials, tissue engineering, controlled-release materials, electrical materials, and medical materials.
Innovation Solution
A mutant PHA polymerase PhaC61-3 with specific amino acid mutations (E115T, A261E, R360S, K457Q) is used to produce a viscous PHA (P (3HB-co-3HU10D)) through genetic engineering of Escherichia coli or Pseudomonas strains, utilizing a fermentation process with glucose and 10-undecenoic acid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional PHA preparation methods are used, then PHAs can be produced, but the varieties of PHAs are limited and viscous PHAs have not been reported
Solution Approach 1:
The patent applies parameter changes by mutating specific amino acid residues (E115T, A261E, R360S, K457Q) in the PhaC61-3 polymerase enzyme to alter the physical properties of the produced PHA, specifically achieving high viscosity. This mutagenesis approach changes the enzymatic parameters to produce novel PHA variants with previously unreported viscous properties.
Solution Approach 2:
The patent produces copolymer PHAs with specific monomer compositions (3-hydroxybutyrate and 3-hydroxyundec-10-enoate in controlled ratios) to achieve desired viscosity characteristics. By combining different monomer units in specific proportions, the patent creates composite polymer structures that exhibit enhanced viscous properties not achievable with conventional homopolymers.
2Strength
If mutant PHA polymerase is used to produce viscous PHA, then viscosity and biodegradability are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent employs preliminary action by pre-construc ting the mutant PhaC61-3 polymerase gene with specific amino acid mutations before introducing it into the host bacterium. This preparatory genetic modification ensures that the organism is pre-equipped with the necessary enzymatic capability to produce viscous PHA, simplifying the overall manufacturing process by consolidating the complexity into a one-time strain development stage rather than requiring complex process controls during production.
3Reliability
If mutant PHA polymerase is used to produce viscous PHA, then biodegradability is improved, but the fermentation process requires optimized parameters
Solution Approach 1:
The patent optimizes fermentation parameters including glucose concentration (10-40 g/L), 10-undecenoic acid concentration (0.1-5 g/L), temperature (28-42°C), and cultivation time (12-72 hours) to maximize both viscosity and biodegradability of the produced PHA. These parameter changes are systematically adjusted to achieve the desired balance between material properties and production efficiency.
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 resulting viscous PHA exhibits enhanced properties suitable for degradable products, including packaging materials, tissue engineering, controlled-release materials, electrical materials, and medical materials, with improved biodegradability and viscosity.
Implementation Method 1
inoculating Pseudomonas into a fermentation culture medium to perform fermentation culture
Data Source
AI summary
The present application relates to the field of microbiological technology, and particularly relates to a viscous polyhydroxyalkanoate, and its preparation and use. The viscous polyhydroxyalkanoate can be produced by fermenting a Pseudomonas strain containing a mutant of PHA polymerase PhaC61-3, and can be used for the preparation of biodegradable products.