Microorganism Gene Modification for 5'-Guanylic Acid Yield

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Solution Overview

Problem

Current methods for producing 5'-guanylic acid (GMP) through fermentation have insufficient yield and struggle with product degradation, making them impractical for industrial applications.

Innovation Solution

A novel microorganism of the genus Escherichia is modified to enhance GMP synthetase activity by decreasing nagD gene transcription and increasing guaA gene expression, while reducing guaB, ushA, and aphA gene expression, allowing for efficient conversion of xanthylic acid to GMP.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional fermentation methods are used to produce GMP, then the production process can be established, but the yield is insufficient and product degradation occurs

Engineering Contradiction:

ImproveGMP yieldVSAvoidproduct degradation

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies parameter changes by modifying gene expression levels to optimize GMP production. Specifically, it decreases the expression of nagD gene (which encodes a nucleotidase that degrades GMP) and increases the expression of guaA gene (which encodes GMP synthetase). This genetic parameter modification resolves the contradiction by simultaneously improving yield and preventing degradation through targeted gene expression control

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts the harmful effect of nagD-encoded nucleotidase (which degrades GMP) into a benefit by suppressing its expression. By decreasing nagD gene transcription, the harmful degradation pathway is blocked, thereby preserving GMP product and improving overall yield and reliability

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Productivity

If multiple gene modifications are made to enhance GMP synthetase activity, then conversion efficiency increases, but the microorganism complexity increases

Engineering Contradiction:

Improveconversion efficiencyVSAvoidmicroorganism modification complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the genetic modification strategy into distinct functional components: (1) decreasing nagD gene expression to prevent degradation, (2) increasing guaA gene expression to enhance synthesis, and (3) optionally modifying other genes like ushA and aphA. This segmented approach allows systematic optimization of conversion efficiency while managing complexity through modular genetic engineering

Inventive Principle:

Principle #1Segmentation

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

This approach significantly increases the yield of GMP, reducing degradation and making the production process more efficient, thereby enabling practical industrial-scale production of GMP for use as a food seasoning and pharmaceutical.

Implementation Method 1

5'-guanylic acid synthetase activity is enhanced by increasing expression of a guaA gene

Methodology Applied

Scientific EffectEnzymatic catalysis: Enzyme

Data Source

PatentEP2295546B1Method for producing 5'-guanylic acid

Publication Date: 2016.09.21 AJINOMOTO CO INC

Figure 1(A)~3(B)

AI summary

5'-guanylic acid (GMP) is produced efficiently by allowing a microorganism to react with xanthylic acid (XMP), wherein said microorganism is able to convert xanthylic acid into 5'-guanylic acid and has been modified so that the nagD gene does not function normally and 5'-guanylic acid synthetase activity is enhanced.