Recombinant E. Coli Co-Expression for High-Purity UDCA Production
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Solution Overview
Problem
Current methods for producing ursodeoxycholic acid (UDCA) face challenges such as limited natural sources, complex chemical synthesis processes, enzyme instability, low substrate stability, high purification costs, and enzyme unavailability at industrial scales, leading to low purity and high costs.
Innovation Solution
Development of recombinant E. coli co-expressing 7β-HSDH and glucose dehydrogenase (GDH) enzymes, optimized for codon usage in E. coli, to catalyze the conversion of 7-oxo-lithocholic acid to UDCA in a complete cell transformation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical synthesis method is used to produce UDCA, then production capacity can be increased, but purity decreases and toxic reagents are required
Solution Approach 1:
The patent replaces chemical synthesis methods with biological synthesis using recombinant E. coli expressing 7β-HSDH enzyme. This substitution eliminates the need for toxic chemical reagents (protecting groups, oxidizing agents) while achieving high purity UDCA production through enzymatic catalysis, directly resolving the contradiction between production capacity and purity
Solution Approach 2:
The patent optimizes multiple parameters including enzyme expression levels, culture conditions, induction timing, and purification protocols to achieve both high productivity and high purity. By adjusting these parameters, the system maintains efficient UDCA production while ensuring purity meets pharmaceutical standards
2Quantity of substance
If natural bear gallbladder source is used, then UDCA can be obtained, but source becomes limited and animal protection issues arise
Solution Approach 1:
The patent uses recombinant E. coli that autonomously produces 7β-HSDH enzyme and catalyzes CDCA conversion to UDCA without requiring bear gallbladders. The engineered bacteria serve themselves by containing both the substrate metabolism pathway and the necessary enzymatic machinery, eliminating dependence on limited natural sources
Solution Approach 2:
The patent introduces recombinant E. coli as an intermediary organism to convert readily available CDCA (from cow or goose bile) into UDCA. This intermediary system bridges the gap between abundant starting materials and the desired high-value product without requiring protected animal sources
3Reliability
If traditional microbial transformation is used, then biological synthesis can be achieved, but enzyme stability is poor and purification costs are high
Solution Approach 1:
The patent employs whole-cell biocatalysis where recombinant E. coli cells are used directly as living factories. Instead of extracting and purifying enzymes (which would be expensive and complex), the entire engineered bacterial cell is used as a disposable biocatalyst that can be cultured rapidly and discarded after use, significantly reducing purification costs while maintaining enzyme stability within the cellular environment
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 method achieves high-purity UDCA production with increased yield and reduced impurities, meeting industrial requirements and environmental sustainability standards.
Implementation Method 1
the recombinant E. coli may simultaneously express two enzymes, which are respectively 7β-HSDH and glucose dehydrogenase (GDH)
Implementation Method 2
7β-hydroxysteroid dehydrogenase (7β-HSDH) and glucose dehydrogenase (GDH)
Data Source
AI summary
The present invention belongs to the field of bioengineering technologies, and in particular, to a production method of recombinant Escherichia coli (E. coli) and high-purity ursodeoxycholic acid (UDCA). The present invention constructs novel double-enzyme co-expression gene engineered bacteria, that is, recombinant E. coli. The bacteria simultaneously expresses 7β-hydroxysteroid dehydrogenase (7β-HSDH) and glucose dehydrogenase (GDH). The bacteria is applicable to the production of high-purity UDCA. The yield of a target product is increased through the joint expression and application of 7β-HSDH and GDH. The production method of high-purity UDCA in the present invention is simple, generates a small amount of impurities in a production process, is a green process that satisfies environmental protection requirements, and has significant industrial application value.