UDP-Galacturonic acid (UDP-GalA) is a vital sugar nucleotide that serves as the activated donor for the incorporation of galacturonic acid residues into complex carbohydrates, notably pectin, a major component of plant cell walls, and various structural glycans. The enzyme responsible for its synthesis, UDP-Glucuronic Acid 4-Epimerase (UGlc AE), utilizes tightly bound NAD+ to catalyze the reversible C4' epimerization of UDP-glucuronic acid (UDP-GlcA). This reaction proceeds through a highly transient 4-keto intermediate, requiring exquisite stereo-electronic control within the enzyme's active site to prevent competing, unwanted side reactions (such as decarboxylation) and ensure product integrity. Creative Biolabs' custom UDP-GalA production service helps you accelerate glycoengineering and metabolic pathway development by providing ultra-high-purity UDP-GalA through proprietary enzyme engineering and optimized biocatalytic synthesis.

Fig. 1. Enzymatic reaction based on Uridine 5'-diphosphate α-D-glucuronic acid. (OA Literature) Fig.1 UDP-GlcA precursor-based enzymatic reaction.¹

Discover How We Produce UDP-GalA - Request a Consultation

Creative Biolabs' expertise in enzyme engineering and biocatalytic process development ensures the delivery of unparalleled UDP-GalA. We leverage deep mechanistic understanding, particularly the critical role of the UGlc AE active site architecture in enforcing stereoselectivity. Our robust, multi-stage workflow is designed for maximum efficiency and quality assurance, transitioning seamlessly from gene to final High-Value Glycomolecule Products.

Required Starting Materials

Highly active UGlc AE

We use multi-modal chromatography to purify the UGlc AE biocatalyst to exceptional purity, ensuring minimal contaminating enzyme activity in the subsequent reaction.

High-purity UDP-GlcA (Substrate)

The project scale is directly proportional to the amount of starting material required; we can source this precursor if needed.

Target production scale

Clear specification of the desired final product quantity and purity level.

Key Steps Involved

Phase I
Biocatalytic Reaction Optimization

The purified enzyme, along with the required NAD+ cofactor, is combined with UDP-GlcA. This step involves precise control of temperature, pH, and concentration to drive the reversible reaction towards the desired product, UDP-GalA.

Phase II
Chromatographic Purification

Following the reaction, the mixture is subjected to specialized preparative HPLC or ion-exchange chromatography. This step effectively separates the high-molecular-weight nucleotide sugar product (UDP-GalA) from the unreacted substrate, protein, and reaction buffer components.

Phase III

Final Quality Control

Final Deliverables:
- Lyophilized UDP-GalA product
- Structural confirmation data

Detailed UDP-GalA production steps. (Creative Biolabs AI)

Core Advantages: Precision and Performance

Atomic-Level Precision via Stereo-electronic Control

Creative Biolabs' engineered UGlc AE variants are designed based on deep structural knowledge, ensuring precise stereo-electronic constraints in the active site. This control channels the intermediate exclusively toward the desired epimerized product (UDP-GalA), maximizing yield and preventing contamination.

Mitigation of Rate-Limiting Steps

Mechanistic studies show that a slow conformational change is often the rate-limiting step in wild-type UGlc AE enzymes. Our protein engineering focuses on optimizing the enzyme's conformational dynamics, accelerating the substrate positioning step for significantly faster overall conversion rates and enhanced throughput.

Dedicated Scaling Expertise

We possess two decades of experience scaling highly complex enzymatic pathways, providing confidence in transitioning from milligram research quantities to high-yield industrial supply.

Application

Synthetic biology and metabolic engineering: Constructing artificial metabolic pathways in microorganisms (such as E. coli or yeast), utilizing UDP-GalA to customize substrates as standards or direct precursors to produce high-value-added plant-derived chemicals or novel carbohydrates.
Drug glycosylation modification: Utilizing UDP-GalA to glycosylate natural products, small molecule drugs, or peptides. Adding galacturonic acid groups can alter drug solubility, stability, and bioactivity, and even improve its targeting.
Pectin biosynthesis research: UDP-GalA is a backbone component of homogalacturonan in pectin. Through custom-produced, high-purity substrates, researchers delve into the functions of glycosyltransferases and elucidate the molecular mechanisms of plant cell wall assembly.

Find Your Perfect Solution - Inquire Now

Published Data

This paper offers a precise characterization of the mechanism utilized by UGlc AE, an enzyme essential for various biosynthetic pathways, as it interconverts UDP-GlcA into UDP-GalA. Classified within the Short-chain Dehydrogenase/Reductase (SDR) family, the enzyme is a homodimer that relies on a tightly bound NAD molecule to facilitate its catalytic cycle. Mechanistically, the reaction involves an initial oxidation at the C4 carbon, leading to a temporary 4-keto sugar intermediate, followed by a reduction that reverses the stereochemistry. The research highlights that the speed of the entire reaction is limited by a crucial, slow-moving conformational transition that must occur within the enzyme before the chemical step of hydride abstraction from the substrate. This structural gate ensures the sugar is perfectly aligned, preventing the unstable intermediate from leaking out or undergoing an unwanted decarboxylation side reaction, thereby maintaining the high fidelity of the epimerization process. The data displayed in the following figure are critical for validating this proposed mechanism, as they contain the enzyme's kinetic measurements.

Fig. 2. Analysis of the C4-H bond activation in UDP-GlcA 4-epimerase. (OA Literature) Fig.2 Analysis of the C4-H bond activation in UGlc AE.¹

FAQs

Q1: What purity level can Creative Biolabs guarantee for custom UDP-GalA orders?

A: We guarantee a minimum purity of 95% as validated by rigorous analytical HPLC and confirmed structurally using NMR and MS analysis. This superior purity is a direct result of our highly selective biocatalyst and advanced chromatographic separation protocols.

Q2: Is your enzymatic synthesis scalable, and what is the typical turnaround time for large-scale production?

A: Yes, our process is inherently scalable. We routinely handle production orders from mg up to g quantities. While the typical turnaround time is 6 to 10 weeks, depending on the scale and complexity, we encourage you to contact our team to discuss expedited options for urgent projects.

Q3: How does your enzymatic production compare to traditional chemical synthesis methods for sugar nucleotides?

A: Enzymatic synthesis, particularly our UGlc AE-driven process, offers significantly higher stereoselectivity than chemical routes, eliminating the need for complex protecting group chemistry and resulting in a product free of toxic chemical byproducts and unwanted stereoisomers. This leads to higher purity and reduced purification costs.

Q4: Our project requires several other complex sugar nucleotides. Can Creative Biolabs provide a comprehensive solution beyond UDP-GalA?

A: Absolutely. UDP-GalA is part of a larger family of nucleotide sugars. Inquire today about leveraging our full suite of enzyme engineering and biocatalytic services to produce UDP-GlcA, UDP-Glucose, UDP-Galactose, or any other precursor required for your complex glycan pathway.

Customer Review

Speed and Reliability
The efficiency gains from Creative Biolabs' optimized UGlc AE biocatalyst are remarkable. Their ability to deliver a 50 g batch of UDP-GalA in under two months, which previously took us six months of internal synthesis and purification, has drastically accelerated our materials development program. This service provides a clear, scalable solution.Principal Investigator, Prof. B. C**n.

Stereoselectivity Assurance
We were highly concerned about the decarboxylation side product common in GlcA-utilizing enzymes. Creative Biolabs' rigorous QC, showing no detectable UDP-pentose impurities, validates their claim of superior stereo-electronic control. The final product stability also exceeded expectations, facilitating long-term storage and use.- Senior Scientist, Dr. M**r.

Extended Services

Custom Enzyme Development

We can further customize and develop various enzymes for specific conditions, including Glycoside Synthase, Glycosyltransferase, Epimerase, etc.

Glycosyltransferase Panel Screening

Utilize our high-throughput screening platform to identify the optimal glycosyltransferase enzyme for efficiently incorporating your newly acquired UDP-GalA into the target acceptor molecule.

Nucleotide Sugar Analytical Services

Dedicated HPLC and NMR-based services to monitor, validate, and quantify all nucleotide sugars within your cellular extracts or in vitro reaction mixtures.

How to Contact Us

Creative Biolabs is your trusted partner in precision biocatalysis. By solving the inherent challenges of enzyme mechanisms, ensuring stereoelectronic control, and mitigating rate-limiting steps, we deliver ultra-high-purity UDP-GalA with industrial scalability. Our commitment to quality, evidenced by rigorous QC and custom-engineered biocatalysts, allows you to focus solely on advancing your complex biological discoveries. Please contact us to take the first step toward accelerated and reliable glycoengineering.

Reference

Borg, Annika J E et al. "Mechanistic characterization of UDP-glucuronic acid 4-epimerase." The FEBS Journal vol. 288,4 (2021): 1163-1178. Distributed under an Open Access license CC BY 4.0, without modification. https://doi.org/10.1111/febs.15478

For Research Use Only.

Related Services

Online Inquiry

Custom UDP-Galacturonic Acid (UDP-GalA) Production Service

Precision Glycan Intermediates for Uncompromised Research!