Nucleic acid contamination can be a hidden bottleneck in bioprocessing. High levels of residual DNA and RNA can increase cell lysate viscosity, complicate filtration and chromatography, and add challenges to downstream purification.
A broad-spectrum nuclease provides a simple way to address these challenges by degrading both DNA and RNA directly in complex biological samples.
In this article, we explore how nuclease treatment can support cell lysis, protein purification, analytical sample preparation, and viral vector manufacturing, and what to consider when selecting a nuclease for your workflow.
Why Nucleic Acid Removal Matters
After cell lysis or biological material processing, large amounts of genomic DNA and RNA can remain in the sample.
These high-molecular-weight nucleic acids can create several common challenges:
- Increased cell lysate viscosity
- Difficult mixing and pipetting
- Reduced filtration and ultrafiltration efficiency
- Interference with protein purification
- Increased nucleic acid burden in biological products
- Background or interference in downstream analytical assays
Traditional approaches may require additional processing steps to address these issues. Nuclease treatment can instead be incorporated directly into sample preparation or upstream processing to break down DNA and RNA before they become a downstream bottleneck.
What Is a Broad-Spectrum Nuclease?
A broad-spectrum nuclease is an enzyme designed to degrade a wide range of nucleic acid substrates.
Unlike nucleases with narrower substrate preferences, broad-spectrum nucleases can act on both DNA and RNA, making them useful when the composition of nucleic acid contaminants is variable or unknown.
For bioprocessing applications, nuclease performance depends not only on catalytic activity but also on compatibility with the surrounding process environment.
Factors such as salt concentration, pH, divalent metal ions, detergents, chelating agents, and reducing agents can all affect nuclease activity.
Therefore, selecting a nuclease should involve more than simply comparing activity units. Compatibility with the actual workflow and sample matrix is equally important.
From Nucleic Acid Removal to Real-World Applications
The need for nuclease treatment is not limited to a single step or application.
In a typical biological workflow, nucleic acids can become problematic at several points—from cell disruption and sample preparation to purification and downstream analysis.
This is where a broad-spectrum nuclease can serve as a versatile process tool.
Application 1: Reduce Cell Lysate Viscosity
One of the most practical applications of nuclease treatment is cell lysis.
When cells are disrupted, genomic DNA released into the lysate can create a highly viscous solution. This can make the sample difficult to mix, pipette, filter, or process through ultrafiltration.
Nuclease treatment breaks down high-molecular-weight nucleic acids into smaller fragments, helping reduce lysate viscosity.
Figure 1. Effect of Benonase Treatment on Cell Lysates.
The result:
Nucleic Acid Degradation → Lower Viscosity → Easier Filtration → Smoother Downstream Purification
This can be particularly valuable in recombinant protein production and other workflows where efficient clarification and chromatography are critical.
Application 2: Nuclease for Analytical Sample Preparation
Nucleic acids can also interfere with protein-focused analytical workflows.
Treating protein samples with nuclease can reduce nucleic acid-associated background and improve sample handling.
Potential applications include:
- Protein Electrophoresis
Reduce nucleic acid-related sample viscosity and improve sample preparation.
- Chromatographic Analysis
Reduce nucleic acid burden before downstream separation.
- Proteomic Workflows
Support cleaner preparation of protein samples for downstream analysis.
The appropriate nuclease concentration and incubation conditions should be optimized based on the sample type and analytical method.
Figure 2. Two-Dimensional Electrophoresis (2-DE) of Mouse Brain Nuclear Proteins.
Comparison of 2-DE profiles between Benonase-treated (Panel A) and untreated (Panel B) samples[2].
Application 3: Removal of DNA/RNA from Biologics
Universal nuclease can be utilized to remove nucleic acids from industrial biologics, such as vaccines, polysaccharides, and proteins. This ensures that the final nucleic acid content meets regulatory compliance standards while simultaneously enhancing the efficacy of the biologic product. Furthermore, researchers have developed an HIV sequencing workflow (HIV-SMART) that leverages universal nuclease to significantly improve HIV viral sequencing coverage without compromising viral nucleic acid recovery rates.
Figure 3. NGS Coverage Maps of CHU1756.
Comparison of next-generation sequencing (NGS) coverage for CHU1756 with universal nuclease treatment (+) and without treatment (–)[1].
Application 4: Nuclease in Viral Vector Manufacturing
Nucleic acid removal is an important consideration in viral vector manufacturing, including lentiviral vector (LV) workflows used in cell and gene therapy. During viral vector production and downstream processing, host-cell DNA and other nucleic acid impurities can contribute to process complexity and need to be appropriately controlled.
Nuclease treatment can help degrade residual nucleic acids during processing, supporting downstream clarification and purification.
For workflows where endotoxin control is particularly important, an endotoxin-free nuclease can provide an additional option for process development and manufacturing-related applications.
A Practical Solution for Nucleic Acid Removal
From cell lysis and protein purification to viral vector processing and analytical sample preparation, nuclease treatment can help address common challenges caused by residual DNA and RNA.
When selecting a nuclease, consider more than activity alone. Substrate range, sample-matrix compatibility, operating conditions, purity requirements, and downstream processing should all be evaluated.
Key Benefits of Yeasen UCF.ME™ Nuclease
Yeasen's UCF.ME™ Nuclease is engineered for broad DNA and RNA degradation across a range of research and bioprocessing applications.
- Broad DNA and RNA Degradation
Designed to degrade a broad range of nucleic acid substrates, helping reduce DNA and RNA contamination in complex biological samples.
- Strong Matrix Compatibility
Nuclease treatment can be applied to a variety of commonly used sample and buffer systems. Compatibility should be evaluated based on the specific formulation and process conditions.
- Flexible Operating Conditions
The enzyme can be evaluated across a broad range of pH and temperature conditions, allowing users to optimize nuclease treatment for different workflows.
Optimize Nuclease Treatment for Your Workflow
There is no single nuclease condition that works for every sample.
Nuclease activity can be affected by several components commonly found in biological workflows:
|
Parameter |
Recommended Starting Point |
|
Mg²⁺ Concentration |
1–2 mM |
|
pH |
8–9 |
|
Temperature |
~37 °C |
|
Incubation Time |
15–60 min at 37 °C |
|
Optimization |
Recommended for each specific sample matrix |
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Reference
[1] Berg M G, Yamaguchi J, Alessandri-Gradt E, et al. A pan-HIV strategy for complete genome sequencing[J]. Journal of clinical microbiology, 2016, 54(4): 868-882.
[2] Jankowska U, Latosinska A, Skupien-Rabian B, et al. Optimized procedure of extraction, purification and proteomic analysis of nuclear proteins from mouse brain[J]. Journal of neuroscience methods, 2016, 261: 1-9.