Coryneform Bacterium Transformant D-Xylose Utilization
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Solution Overview
Problem
Current technologies face challenges in effectively utilizing D-xylose from cellulosic biomass due to glucose repression, leading to inefficient simultaneous utilization of D-glucose and D-xylose by microorganisms, which hinders the industrial application of cellulosic biomass for organic compound production.
Innovation Solution
A coryneform bacterium transformant is created by transferring an L-arabinose transport system proton symporter gene, enabling improved D-xylose utilization rates and eliminating glucose repression, allowing for simultaneous parallel utilization of D-glucose and D-xylose.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a microorganism is used to utilize both D-glucose and D-xylose simultaneously, then the utilization of cellulosic biomass is improved, but glucose repression occurs where the presence of D-glucose inhibits D-xylose utilization
Solution Approach 1:
The patent applies parameter changes by modifying the microorganism's genetic parameters - specifically introducing or modifying transporter proteins and regulatory proteins that control sugar uptake and metabolism. This genetic modification changes the organism's physiological parameters to eliminate glucose repression and enable simultaneous utilization of both sugars at equivalent rates.
Solution Approach 2:
The patent uses intermediary proteins as mediators - specifically transporter proteins that facilitate D-xylose uptake and regulatory proteins that mediate the interaction between glucose and xylose metabolism. These intermediary proteins bridge the gap between the two sugar utilization pathways, allowing them to operate simultaneously without inhibition.
2Productivity
If the rate of D-xylose utilization is improved, then the efficiency of organic compound production is improved, but the complexity of process design and operation control increases due to glucose repression
Solution Approach 1:
The patent extracts and eliminates the harmful regulatory mechanism causing glucose repression through genetic modification. By removing or modifying the repressive regulatory proteins, the process control complexity is reduced while maintaining high D-xylose utilization rates, as the system no longer requires complex control to manage sugar interaction.
3Adaptability or versatility
If wild-type Saccharomyces cerevisiae is provided with D-xylose-utilizing ability by transferring genes, then D-xylose utilization capability is improved, but the rate of D-xylose utilization remains insufficient and glucose repression is observed
Solution Approach 1:
The patent segments the sugar utilization system into distinct functional components - separate transporter proteins for glucose and xylose, separate regulatory proteins, and distinct metabolic pathways. This segmentation allows each component to be optimized independently, with transporter proteins specifically tailored for high-rate xylose uptake that operates independently of glucose presence, thereby eliminating the repression effect.
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 coryneform bacterium transformant achieves effective and equivalent utilization rates of D-glucose and D-xylose, facilitating the efficient production of organic compounds from cellulosic biomass, thereby improving the process design and operation of biomass utilization.
Implementation Method 1
transferring an L-arabinose transport system proton symporter gene into a coryneform bacterium capable of utilizing D-xylose
Implementation Method 2
producing various kinds of organic acid compounds, ethanol, or the like by a biological method
Data Source
AI summary
A coryneform bacterium transformant prepared by transferring an exogenous gene which encodes a protein having a sugar transporter function into a coryneform bacterium capable of utilizing D-xylose.