GTPase Assay Kit

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Other Names
GTPase Assay, GTPase colorimetric assay
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689003 480 tests 816€
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The GTPase colorimetric assay kit employs a 96-well plate format with all of the reagents necessary for measuring GTPase activity. The kit also contains PhosChrome™ (a superior malachite green reagent) which has special additives to prevent backgrounds arising out of non-enzymatic GTP hydrolysis.

Product Details
Technical Data Sheet (pdf)

Kit Contents

Kit Contents

PhosChrome™ - 1 bottle, 25mL
Accelerator - 1 vial, 0.5mL
Stabilizer - 1 bottle, 10mL
0.1M MgCl2 - 2 vials, 1.5mL
0.5M Tris pH 7.5 - 1 bottle, 10mL
0.1mM Pi Standard - 1 bottle, 10mL
GTP - 10 vials, lyophilized
96-well plates - 5 plates

Product Details


Enzyme activity assay

Recommended Usage

See manual for instructions.

Application Notes

Key Features:

  • High throughput colorimetric enzymatic assay
  • Simple to use, scalable, and non-radioactive
  • Compatible with any assay buffer
  • Stable reagent formulation that ensures long shelf life
  • Suppresses non enzymatic backgrounds with acid-labile substrates
  • No precipitation, results can be measured over several hours
  • Wide linear range, no inhibition of color development by high concentrations of protein


How it works:

Assays are based on the formation of green colored complexes between an inorganic phosphate and PhosChrome™ (an orange colored superior malachite green reagent) under acidic conditions.

Application References
  1. Ellinger D, et al. 2014. The Plant Cell. 26:3185-3200.
  2. Gündner A, et al. 2014. PLoS One. 9:e97332.
  3. Alaganan A, et al. 2014. Proc. Natl. Acad. Sci. USA 111(3):1126-1131.
  4. Santhosh KT, et al. 2014. British Journal of Pharmacology. 171:676-687.
  5. Zhang K, et al. 2013. The Journal of Neuroscience. 33:7451-7462.
  6. Mallozzi C, et al. 2013. Biochim. Biophys. Acta. 1833:110-121.
  7. Gonzalez-Flores JN, et al. 2012 J. Biol. Chem. 287:38936-38945.
  8. Gopalakrishnan J, et al. 2012. Nat. Cell. Biol. 14: 865-873.
  9. Wang Z, et al. 2012. Cell. 148:228-243
  10. Han JM, et al. 2012. Cell. 149:410-424.

Antigen Details

Biology Area
Cell Biology, Cell Proliferation and Viability
Gene ID

Related FAQs

I have 5% DMSO in my assay. Can I use PhosChrome™?

Yes, the reagent is designed for drug screening work and other situations that require DMSO.

I have phosphate in my enzyme. What can I do?

You can dialyze or desalt the enzyme into a phosphate-free buffer.

Why do I get a high background when my enzyme definitely has no free Pi?

This is almost certainly caused by inadequate mixing of the Stabilizer. This results in a high background signal because of non-enzymatic decay of ATP substrate. The Stabilizer is added in a relatively small volume (20μL), and the operation of pipetting up and down with a pipette set to 20μL volume may not result in sufficient mixing when the total volume is 270μL. Try pipetting up and down while stirring at the same time. Alternatively, add the Stabilizer with one pipette set at 20μL volume and mix using a larger pipette set to ~150μL volume. This ensures thorough mixing of the Stabilizer solution with minimal effort.

Go To Top Version: 3    Revision Date: 12/28/2016

For research use only. Not for diagnostic use. Not for resale. BioLegend will not be held responsible for patent infringement or other violations that may occur with the use of our products.


*These products may be covered by one or more Limited Use Label Licenses (see the BioLegend Catalog or our website, BioLegend products may not be transferred to third parties, resold, modified for resale, or used to manufacture commercial products, reverse engineer functionally similar materials, or to provide a service to third parties without written approval of BioLegend. By use of these products you accept the terms and conditions of all applicable Limited Use Label Licenses. Unless otherwise indicated, these products are for research use only and are not intended for human or animal diagnostic, therapeutic or commercial use.


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