Tris-Gly-Native Running Buffer (Powder): Protocol & Uses

Tris-Gly-Native Running Buffer (Powder) is a ready-to-dissolve, non-denaturing electrophoresis buffer formulation designed to preserve native protein conformation and biological activity during polyacrylamide gel electrophoresis.

Product SKU

T767966

Format

Powder (ready-to-dissolve concentrate)

Application

Native polyacrylamide gel electrophoresis (Native PAGE)

Key Components

Tris (tris(hydroxymethyl)aminomethane) and Glycine

Electrophoresis Condition

Non-denaturing; no SDS or reducing agents

Separation Basis

Native charge, size, and shape of proteins

What Is Tris-Gly-Native Running Buffer?

Tris-Gly-Native Running Buffer is a non-denaturing electrophoresis buffer used to separate proteins under conditions that preserve their native tertiary and quaternary structure, as well as biological activity. Unlike SDS-PAGE buffers, this formulation contains no sodium dodecyl sulfate (SDS) and no reducing agents such as dithiothreitol (DTT) or beta-mercaptoethanol, meaning proteins migrate through the gel based on their intrinsic charge, molecular size, and three-dimensional shape rather than molecular weight alone.

The powder format (SKU: T767966) offered by Aladdin Scientific provides a convenient, pre-weighed, and stable alternative to liquid buffer stocks, reducing preparation time and minimizing pipetting errors. Each packet is formulated to yield a working-concentration buffer upon dissolution in the appropriate volume of deionized or ultrapure water.

Composition and Working Principle

The buffer is composed of two primary components: Tris (tris(hydroxymethyl)aminomethane) as the buffering base, and glycine as the trailing ion in a discontinuous buffer system. When dissolved to the recommended concentration, the solution maintains a mildly alkaline pH (typically around pH 8.3–8.5 at working concentration), which imparts a net negative charge to most proteins at physiological to alkaline pH, allowing them to migrate toward the anode during electrophoresis.

In a native discontinuous (Ornstein-Davis) system, the Tris-glycine buffer interacts with the stacking and resolving gel components to create moving boundary conditions that concentrate and then resolve protein bands with high resolution. Because no denaturing agents are present, the native conformation of proteins is maintained throughout the run, making this system ideal for studying protein-protein interactions, oligomeric states, enzyme activity staining, and other conformation-dependent assays.

Buffer Preparation Protocol

The following general protocol describes preparation of Tris-Gly-Native Running Buffer from the powder format. Always consult the product-specific label and Certificate of Analysis for exact dissolution instructions.

1. Dissolve the powder: Transfer the entire contents of one packet into a clean volumetric container. Add approximately 800 mL of deionized or ultrapure water and stir until completely dissolved.
2. Adjust volume: Bring the solution to the final volume (typically 1 L) with additional deionized water to achieve the working concentration (1×).
3. Check pH: Verify that the pH falls within the expected range (approximately 8.3–8.5) using a calibrated pH meter. Do not adjust pH with acid or base unless specifically instructed, as this may alter the buffering capacity and glycine ionization state.
4. Filter if needed: For sensitive applications, filter through a 0.22 µm membrane filter.
5. Store: Store the prepared buffer at 4 °C for up to 2 weeks, or at room temperature for short-term use (1–3 days). Avoid contamination and discard if turbidity or precipitation is observed.

Note: Do not add SDS, DTT, or any denaturing agents to this buffer if native conditions are required.

Applications and Advantages

Tris-Gly-Native Running Buffer is widely used across multiple research disciplines where preservation of protein native state is critical:

• Protein-protein interaction studies: Complexes are maintained intact during electrophoresis, allowing visualization of interaction partners.
• Enzyme activity detection: In-gel activity staining (zymography) can be performed after native PAGE because enzymatic activity is retained.
• Isoform and charge variant analysis: Proteins differing in charge (e.g., due to post-translational modifications) can be resolved without the confounding effect of SDS.
• Oligomeric state determination: Multimeric protein assemblies migrate as intact complexes, enabling assessment of quaternary structure.
• Immunoglobulin and antibody characterization: Native conditions preserve binding domains and structural integrity.

The powder format offers additional practical advantages: extended shelf life compared to liquid buffers, reduced shipping weight, minimized risk of leakage, and batch-to-batch consistency ensured by precise manufacturing.

Troubleshooting Common Issues

Even with a well-formulated buffer, native PAGE can present challenges. The following troubleshooting guide addresses the most frequent problems:

Problem	Likely Cause	Suggested Solution
Diffuse or smeared bands	Overloading, improper pH, or protein aggregation	Reduce protein load; verify buffer pH; keep samples on ice
No protein migration	Incorrect buffer polarity, protein is positively charged at run pH	Reverse electrode connections; consider running at lower pH or acidic native PAGE
Poor resolution between bands	Incorrect gel percentage or run conditions	Optimize acrylamide concentration; reduce run temperature
Precipitation in buffer	Incomplete dissolution or contamination	Re-dissolve with gentle heating and stirring; use freshly prepared buffer
High background after staining	Residual buffer components interfering with stain	Extend destaining time; use recommended staining protocol

Frequently asked questions

What is the difference between Tris-Gly-Native Running Buffer and Tris-Gly-SDS Running Buffer?

The key difference is the presence of SDS (sodium dodecyl sulfate) in SDS running buffers. SDS denatures proteins and imparts a uniform negative charge, so separation is based solely on molecular weight. The native buffer contains no SDS or reducing agents, allowing proteins to migrate based on their natural charge, size, and shape, thus preserving biological activity and quaternary structure.

Can I add SDS or DTT to this buffer for denaturing PAGE?

No. This product is specifically formulated for non-denaturing native PAGE. Adding SDS or DTT would convert it to a denaturing system, undermining the purpose of native electrophoresis and potentially yielding unpredictable results. For denaturing SDS-PAGE, please use a dedicated Tris-Gly-SDS Running Buffer.

How should I store the prepared Tris-Gly-Native Running Buffer?

Prepared buffer should be stored at 4 °C in a sealed container for up to approximately 2 weeks. For short-term use (1–3 days), storage at room temperature is acceptable. Discard the buffer if any turbidity, precipitation, or signs of microbial contamination are observed. The dry powder should be stored at room temperature away from moisture.

What acrylamide gel percentage should I use with this buffer for native PAGE?

The optimal acrylamide percentage depends on the molecular weight and size of your target proteins. Typically, 6–10% gels are used for large proteins and complexes, while 10–15% gels are suitable for smaller proteins. A gradient gel (e.g., 4–20%) can provide broad-range resolution in a single run. Consult published native PAGE protocols for guidance specific to your target.

Is this buffer compatible with downstream activity staining or mass spectrometry?

Yes, Tris-Glycine native running buffer is generally compatible with in-gel enzyme activity staining (zymography) because proteins retain their native conformation and activity. For mass spectrometry applications, the buffer components (Tris and glycine) can be removed by standard destaining, washing, or in-gel digestion protocols, though compatibility should be verified for specific MS workflows.

References

1. Ornstein L. Disc electrophoresis. I. Background and theory. Annals of the New York Academy of Sciences. 1964;121:321-349.
2. Davis BJ. Disc electrophoresis. II. Method and application to human serum proteins. Annals of the New York Academy of Sciences. 1964;121:404-427.
3. Gallagher SR. One-dimensional SDS gel electrophoresis of proteins. Current Protocols in Molecular Biology. 2012;Chapter 10:Unit 10.2A.

Products are supplied for research and development use only. Not for use in humans, animals, diagnosis, or therapy.