Surface-Displayed α-Galactosidase for Soybean Molasses Hydrolysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current microorganisms are unable to degrade oligosaccharides such as raffinose and stachyose, which are present in soybean molasses, limiting their utilization as a sugar raw material.
Innovation Solution
A transformed microorganism capable of displaying α-galactosidase on its surface layer, specifically α-galactosidase C (AglC), is developed, enabling the hydrolysis of α-1,6 linked galactose residues in oligosaccharides, allowing for the utilization of soybean molasses in alcohol and lactic acid production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional microorganisms are used, then they cannot degrade oligosaccharides such as raffinose and stachyose, but this limits the utilization of soybean molasses as a sugar raw material
Solution Approach 1:
The microorganism is genetically engineered to produce and display α-galactosidase on its own cell surface, enabling it to autonomously degrade oligosaccharides in soybean molasses. This self-service capability allows the microorganism to directly utilize the waste material without requiring external enzyme addition, thereby converting waste into usable sugars for fermentation.
Solution Approach 2:
The invention changes the biochemical parameters of the microorganism by introducing the α-galactosidase gene and optimizing its expression on the cell surface. This parameter change enables the microorganism to acquire the ability to hydrolyze α-1,6 linked galactose residues in oligosaccharides, transforming it from an organism that cannot utilize soybean molasses to one that can efficiently degrade and ferment it.
2Ease of operation
If surface display technology is applied to display enzymes on cell surface, then enzyme availability is improved, but the microorganism must be genetically transformed which increases complexity
Solution Approach 1:
The α-galactosidase enzyme function is extracted from the microorganism's internal metabolism and repositioned to the cell surface through genetic engineering. This extraction allows the enzyme to be displayed on the cell surface where it can directly access and degrade oligosaccharides in the surrounding medium, improving enzyme availability and efficiency.
Solution Approach 2:
The cell surface acts as an intermediary platform that bridges the microorganism's internal enzyme production capability and the external substrate (oligosaccharides in soybean molasses). By displaying the enzyme on the cell surface, the system creates an efficient interface where substrate degradation can occur without requiring the substrate to enter the cell or the enzyme to be secreted into the medium.
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 surface-display microorganism effectively hydrolyzes oligosaccharides in soybean molasses, converting them into usable sugars for fermentation, thereby utilizing previously discarded soybean molasses as a sugar raw material for alcohol and lactic acid production.
Implementation Method 1
α-galactosidase is an enzyme that hydrolyzes this bond... capable of hydrolyzing oligosaccharides containing α-1,6 linked α-galactose
Implementation Method 2
a step of culturing the transformed microorganism having an alcohol fermentation ability... The present invention provides a method for producing alcohol
Implementation Method 3
a step of culturing a lactic acid bacterium in a culture medium containing the saccharified material... a step of culturing the transformed microorganism being a lactic acid bacterium
Data Source
AI summary
The present invention provides a transformed microorganism capable of displaying α-galactosidase on its surface layer. Also provided is a method for producing an alcohol, which includes the step of culturing the transformed microorganism in a culture medium containing a material that contains an oligosaccharide α-1,6 linked α-galactose. Also provided is a method for producing lactic acid using such a transformed microorganism together with a material that contains an oligosaccharide α-1,6 linked α-galactose. According to the present invention, a microorganism can be provided, which can degrade an oligosaccharide containing α-1,6 linked α-galactose, which may occur in soybean molasses.