Zebrafish D-Glucuronyl C5-Epimerase for Heparosan Isomerization
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Solution Overview
Problem
Current methods for producing heparan sulfate from heparosan lack efficient enzymes for C5-epimerization, which is essential for isomerizing glucuronic acid residues to iduronic acid, resulting in insufficient activity and the need for more effective catalysts.
Innovation Solution
Employing proteins with 80% or more sequence homology to D-glucuronyl C5-epimerase derived from zebrafish, specifically using amino acid sequences with high homology and modified residues, to catalyze the C5-epimerization reaction, either from zebrafish or expressed in transformed microorganisms like Escherichia coli, to efficiently produce heparan sulfate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mammal-derived C5-epimerase or marine bacterium-derived protein is used for C5-epimerization, then the reaction can proceed, but the C5-epimerization activity is insufficient
Solution Approach 1:
The patent changes the source organism parameter from mammal or marine bacterium to zebrafish, and further optimizes by selecting specific proteins with 80% or more sequence homology to zebrafish D-glucuronyl C5-epimerase. This parameter change results in significantly enhanced C5-epimerization activity and production efficiency
Solution Approach 2:
The patent uses proteins that are copies or variants of the native zebrafish D-glucuronyl C5-epimerase, including full-length proteins, truncated proteins, and proteins with 80% or more sequence homology. These copied proteins maintain or enhance the catalytic activity while allowing for optimized expression in heterologous systems
2Ease of manufacture
If existing C5-epimerases are used, then heparan sulfate production is possible, but the process requires more complex conditions and lower efficiency
Solution Approach 1:
The patent enables the production system to be self-sufficient by expressing the zebrafish-derived C5-epimerase protein directly in the production system, eliminating the need for complex enzyme purification and activation steps. The protein can be expressed as a functional enzyme that directly catalyzes the C5-epimerization reaction
Solution Approach 2:
The patent optimizes multiple parameters including protein sequence (80% or more homology to zebrafish native protein), protein length (full-length or truncated variants), and expression conditions to achieve both simplicity and high efficiency in heparan sulfate production
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 use of these proteins significantly enhances the C5-epimerization activity, enabling the production of heparan sulfate with improved efficiency and specificity, overcoming the limitations of existing enzymes.
Implementation Method 1
a reaction for isomerizing a part of a hexuronic acid residue, i.e., a reaction for isomerizing the part of the D-glucuronic acid residues to α-L-iduronic acids (C5-epimerization reaction), is required
Data Source
AI summary
The present invention provides a method for producing a heparosan compound having an isomerized hexuronic acid residue and a method for producing a heparan sulfate with improved C5-epimerization efficiency. Specifically, the present invention provides a method for producing a heparosan compound having an isomerized hexuronic acid residue, said method comprising producing the heparosan compound having the isomerized hexuronic acid residue from a heparosan compound in the presence of a protein selected from the group of consisting of the following (A) to (F): (A) a protein comprising the amino acid sequence of SEQ ID No:2; (B) a protein which comprises an amino acid sequence having 90% or more homology to the amino acid sequence of SEQ ID No:2 and has a D-glucuronyl C5-epimerase substituted, added or inserted amino acid residues in the amino acid sequence of SEQ ID No:2 and has a D-glucuronyl C5-epimerase activity; (D) a protein comprising the amino acid sequence of SEQ ID NO:5; (E) a protein which comprises an amino acid sequence having 90% or more homology to the amino acid sequence of SEQ ID No:5 and has a D-glucuronyl C5-epimerase activity; and (F) a protein which comprises an amino acid sequence having one or several deleted, substituted, added or inserted amino acid residues in the amino acid sequence of SEQ ID No:5 and has a D-glucuronyl C5-epimerase activity.