Overview
UDG Enzyme, or Uracil-DNA Glycosylase, is a repair enzyme that cleaves uracil bases from DNA strands, preventing carryover contamination in PCR. It is indispensable in molecular biology labs, particularly for high-sensitivity applications like NGS and forensic analysis. First isolated from E. coli, recombinant UDG is now produced commercially with high purity. Its ability to selectively degrade uracil-containing DNA without affecting thymidine makes it ideal for dUTP-based contamination control systems.
Physical and Chemical Properties
UDG enzymes typically exhibit optimal activity at 37°C in neutral pH buffers (pH 7-8). The E. coli-derived variant has a molecular weight of ~25 kDa and retains stability in glycerol-containing storage buffers. A defining feature is its thermolability – most commercial UDG formulations are irreversibly inactivated at 95°C for 10 minutes, allowing subsequent PCR amplification steps to proceed unaffected. This property is critical for its use in pre-PCR reaction setups.
Main Applications
In PCR workflows, UDG prevents amplicon contamination by degrading previous PCR products containing dUTP. This is standard practice in clinical diagnostics and high-throughput sequencing facilities. Beyond contamination control, UDG enables ancient DNA research by removing deaminated cytosines (manifesting as uracils) from degraded samples. It's also used in site-directed mutagenesis kits and DNA repair mechanism studies.
Safety and Storage
While UDG poses minimal biological hazard, lyophilized powder should be handled with care to avoid inhalation. Reconstituted enzymes require storage at -20°C with avoidance of repeated freeze-thaw cycles to maintain activity. For lab safety, any UDG-treated waste should be autoclaved before disposal. Containers must be clearly labeled, especially when working with thermostable UDG variants used in specialized applications.
B2B Procurement Guide
When sourcing UDG enzymes, prioritize suppliers providing Certificates of Analysis with documented activity (units/µL) and purity (>90% by SDS-PAGE). E. coli-expressed UDG is most cost-effective for routine applications. Bulk buyers should request batch-to-batch consistency data and consider ready-to-use master mixes with integrated UDG for streamlined workflows. For specialized needs, thermostable variants (e.g., from archaea) command premium pricing.
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