Targeting key GTPases such as Ras and Rho? UA-Glo® GTPase provides a reliable solution for drug screening.

GTPases (Guanosine Triphosphatases) are a superfamily of proteins that play a central regulatory role in cellular signal transduction, widely involved in key biological processes such as cell proliferation, differentiation, migration, vesicle trafficking, and cytoskeleton remodeling. GTPases function as molecular switches, cycling between the active GTP-bound state and the inactive GDP-bound state. This process is precisely regulated by two types of regulatory proteins: Guanine nucleotide exchange factors (GEFs) catalyze the dissociation of GDP from inactive GTPases and load GTP, activating signaling pathways; while GTPase-activating proteins (GAPs) stimulate GTP hydrolysis, terminating signal transduction.

Source: Nature Reviews Molecular Cell Biology

Accurate and sensitive detection of GTPase activity and the function of its regulatory proteins (GAPs and GEFs) is fundamental for understanding signal transduction mechanisms, drug screening, and disease research. The UA-Glo® GTPase Activity Detection Kit provides a simple, sensitive, and high-throughput-compatible solution for this field.

The UA-Glo® GTPase Activity Detection Kit is a homogeneous bioluminescence detection system. Its core design principle is to indirectly reflect enzyme activity by quantitatively measuring the remaining GTP in the system after the GTPase reaction. The specific detection process is as follows:

1. GTPase reaction phase: Incubate the target GTPase (or GAP/GEF) with substrate GTP in an optimized reaction buffer. The GTPase hydrolyzes GTP into GDP and inorganic phosphate.

2. Conversion of remaining GTP: After the reaction, add a conversion reagent to convert all remaining GTP in the system into ATP.

3. Bioluminescence detection: Add the Detection Reagent, which contains a proprietary thermostable luciferase and its substrate luciferin. ATP drives the luciferase-catalyzed luminescence reaction, producing a stable bioluminescence signal.

4. Signal reading: Record the luminescence intensity.

The luminescence signal is inversely proportional to enzyme activity: Higher GTPase activity consumes more GTP, leaving less remaining GTP, resulting in less ATP conversion and lower luminescence signal; conversely, lower GTPase activity leaves more GTP, leading to a stronger luminescence signal.

This detection system is compatible with 96-well, 384-well, and 1536-well plates, adopting a simple "add-and-read" operation mode, greatly simplifying the experimental workflow.

1. High Sensitivity and Wide Dynamic Range

The UA-Glo® GTPase Activity Detection Kit can detect GTPase regulatory enzymes at the low nanogram level. Thanks to the high signal-to-noise ratio of bioluminescence detection, this method features low background noise and a wide dynamic range, enabling accurate differentiation of samples with varying activity levels.

2. Homogeneous "Add-and-Read" Operation

Unlike traditional radioactive detection methods that require multiple washing or separation steps, this kit employs a homogeneous detection mode—all reactions are completed in the same well without separation steps. The simple "add-and-read" workflow significantly reduces operation time and human error.

3. High-Throughput Compatibility

The kit is compatible with 96-well, 384-well, and 1536-well plates, easily adaptable to automated high-throughput screening platforms, making it particularly suitable for large-scale compound library screening or enzymatic kinetic studies.

4. Safe and Non-Radioactive Detection Solution

Traditional GTPase activity detection often relies on radioactively labeled GTP (e.g., [γ-³²P]GTP), posing radiation hazards and waste disposal issues. The UA-Glo® GTPase Activity Detection Kit uses bioluminescence detection, completely avoiding the use of radioactive isotopes, making it safer and more environmentally friendly.

5. Summary

The UA-Glo® GTPase Activity Detection Kit, with its high sensitivity, homogeneous and simple operation, high-throughput compatibility, and safe non-radioactive advantages, has become a core tool for GTPase signaling pathway research. Whether for basic enzymatic mechanism analysis or high-throughput drug compound screening, it provides stable and reliable detection data, meeting research needs in fields such as oncology, neuroscience, and immunology.

Keywords: GTPases, Guanosine Triphosphatases, Rho proteins, GEF Guanine nucleotide exchange factors, GAP GTPase-activating proteins, GDP, GTP, Molecular switches, Cellular signal transduction, Cytoskeleton remodeling, Cell proliferation and migration, UA-Glo, GTPase activity detection kit, High-throughput drug screening