Genetically Engineered Strain Alginate Lyase Production
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Solution Overview
Problem
Current methods for obtaining alginate oligosaccharides through enzymatic hydrolysis face limitations due to low enzyme production levels and substrate specificity, hindering industrialization and the development of high-efficiency alginate lyases.
Innovation Solution
A genetically engineered alginate lyase-producing strain is developed using 16S rDNA and a PSKH plasmid, with optimized fermentation conditions, including specific culture media and temperatures, to enhance enzyme activity and stability, and adaptability to various substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional enrichment and screening methods are used to obtain enzyme-producing strains, then strain diversity can be explored, but the enzyme production levels remain low and industrialization cannot be achieved
Solution Approach 1:
The patent applies parameter changes by optimizing fermentation conditions including temperature (28-32°C), pH (7.0-7.5), aeration rate (1.5-2.5 v/v/min), and agitation speed (160-200 rpm) to dramatically increase enzyme production from 6.48 U/mL to over 1800 U/mL, making industrialization feasible
Solution Approach 2:
The patent uses preliminary action by pre-culturing the strain in optimized seed media before main fermentation, and by conducting small-scale fermentation trials to determine optimal conditions before large-scale production, ensuring high productivity from the outset
2Adaptability or versatility
If alginate lyase is derived from marine bacteria through traditional screening, then enzyme sources can be obtained, but substrate specificity is high and adaptability to different substrates is poor
Solution Approach 1:
The patent achieves universality by engineering the strain to effectively degrade multiple substrate types including brown algae, green algae, and red algae with consistent high enzyme activity, making the enzyme preparation process applicable to various feedstock sources
Solution Approach 2:
The patent uses parameter changes in the fermentation medium composition, including optimized carbon sources, nitrogen sources, and mineral supplements, to enhance the enzyme's adaptability to different substrate types while maintaining high activity levels
3Reliability
If traditional fermentation conditions are used, then simple processes can be maintained, but enzyme activity and stability are insufficient for industrial application
Solution Approach 1:
The patent applies parameter changes by optimizing fermentation temperature (28-32°C), pH (7.0-7.5), aeration rate (1.5-2.5 v/v/min), and agitation speed (160-200 rpm) to dramatically improve enzyme stability and activity, achieving industrial application standards
Solution Approach 2:
The patent uses feedback by monitoring enzyme activity during fermentation and adjusting process parameters accordingly, and by analyzing fermentation broth composition to optimize conditions for maximum enzyme production and stability
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 genetically engineered strain exhibits fast growth, high enzyme activity, and strong substrate adaptability, doubling enzyme activity through repeated cloning of the 16S DNA fragment, demonstrating its potential for industrial-scale alginate oligosaccharide production.
Implementation Method 1
enzymatic hydrolysis is a biodegradation method with mild conditions, strong controllability and high specificity
Implementation Method 2
Alginate lyase degrades alginate through β elimination mechanism
Implementation Method 3
fermentation method of the genetically engineered strain
Data Source
Figure 1
AI summary
The invention relates to the technical field of microorganisms, in particular to an alginate lyase-producing genetic engineered strain and a fermentation method thereof. The sequence of the 16S rDNA transferred into the alginate lyase-producing genetic engineered strain is shown as SEQ ID NO:1. The strain of the invention has the advantages of fast growth, high enzyme activity, good enzyme stability, strong adaptability to substrates from different sources, etc., and therefore has good application prospects.