GTPase Colorimetric Assay Kit


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Product Details

Kit Type
Colorimetric Assay Kit

Order Details

GTPase Colorimetric Assay Kit Summary

This non radioactive colorimetric assay kit contains all the necessary reagents for measuring enzyme activity (everything included in the PiColorlock kit and more) and is ideal for high throughput drug screening.

The kits contain our PiColorlock, a non-radioactive, superior phosphate detection reagent.

Key Features of PiColorLock:
  • Colorimetric Assay-competitor assays are radioactive.
  • Special additive ensures low backgrounds with acid-labile substrates.
  • Unparalleled stability of phosphate-dye complexes.
  • Reagent is compatible with almost any assay buffer.
  • No inhibition of color development by high concentrations of protein.
  • Stable reagent formulation - long shelf life.
Colorimetric assays for GTPases are invariably based on the formation of colored complexes between an inorganic phosphate and a dye molecule under acidic conditions.
Kit Type
Colorimetric Assay Kit


Read Publications using 602-0121.

Packaging, Storage & Formulations

Storage of components varies. See protocol for specific instructions.

Kit Components

  1. 1 x 0.25 ml of Accelerator (1 x 0.5 ml)
  2. 1 x 1.5 ml of 0.1M MgCl2 (2 x 1.5 ml)
  3. 1 x 10 ml of PiColorLock (1 x 25 ml)
  4. 1 x 5 ml of 0.1mM Pi standard (1 x 10 ml)
  5. 1 x 5 ml of Stabiliser (1 x 10 ml)
  6. 1 x 5 ml of 0.5M Tris pH 7.5 (1 x 10 ml)
  7. 2 x 96-well plates (5 plates)
  8. 4 vials of lyophilized ATP (10 vials)


This prodcut is manufacture by Innova Biosciences.


This product is for research use only and is not approved for use in humans or in clinical diagnosis. Kits are guaranteed for 6 months from date of receipt.

Publications for GTPase Kit (602-0121)(27)

Showing Publications 1 - 10 of 27. Show All 27 Publications.
Publications using 602-0121 Applications Species
Ho DH, Jang J, Joe EH et al. G2385R and I2020T Mutations Increase LRRK2 GTPase Activity. Biomed Res Int. 2016 [PMID: 27314038]
Hwang J, Kim HS, Kang BS et al. RGS19 converts iron deprivation stress into a growth-inhibitory signal. Biochem Biophys Res Commun. 2015 Aug 14 [PMID: 26116529]
Cha GH, Wang W, Peng T et al. A Rac1 GTPase is a critical factor in the immune response of shrimp (Litopenaeus vannamei) to Vibrio alginolyticus infection. Dev Comp Immunol. 2015 [PMID: 25892021]
Yan J, Liu XH, Han MZ et al. Blockage of GSK3 beta-mediated Drp1 phosphorylation provides neuroprotection in neuronal and mouse models of Alzheimer’s disease. Neurobiol Aging 2014 [PMID: 25192600]
Ellinger D, Glockner A, Koch J et al. Interaction of the Arabidopsis GTPase RabA4c with Its Effector PMR4 Results in Complete Penetration Resistance to Powdery Mildew. Plant Cell 2014 [PMID: 25056861]
Gundner AL, Hahn I, Sendscheid O et al. The PIKE Homolog Centaurin gamma Regulates Developmental Timing in Drosophila. PLoS One 2014 [PMID: 24845618]
Santhosh KT, Sikarwar AS, Hinton M et al. Thromboxane Receptor Hyper-Responsiveness in Hypoxic Pulmonary Hypertension Requires Serine 324. Br J Pharmacol. 2013 [PMID: 24490858]
Alaganan A, Fentress SJ, Tang K et al. Toxoplasma GRA7 effector increases turnover of immunity-related GTPases and contributes to acute virulence in the mouse. PNAS 2013 [PMID: 24390541]
Zhang K, Fishel Ben Kenan R, Osakada Y et al. Defective Axonal Transport of Rab7 GTPase Results in Dysregulated Trophic Signaling. J Neurosci 2013 [PMID: 23616551]
Mallozzi C, D'Amore C, Camerini S et al. Phosphorylation and nitration of tyrosine residues affect functional properties of Synaptophysin and Dynamin I, two proteins involved in exo-endocytosis of synaptic vesicles. Biochim Biophys Acta. 2012 [PMID: 23103755]
Show All 27 Publications.

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FAQs for GTPase Kit (602-0121). (Showing 1 - 5 of 5 FAQs).

  1. May we have the protocol for 602-0120?The info. from seems insufficient.
    • Here is the corresponding full protocol for your customer for this kit. I hope they find this information useful.
  2. I have phosphate in my enzyme. What can I do?
    • You can dialyse or desalt the enzyme into a phosphate-free buffer. Alternatively, you can use a special resin (PiBind) to remove the phosphate.
  3. I have 5% DMSO in my assay. Can I use PiColorLock Gold?
    • Yes, the reagent is designed for drug screening work and other situations that require DMSO.
  4. I have a high background in my ATPase assay and I definitely do not have free phosphate in my sample
    • This is almost always due to inadequate mixing of the special stabilizer with the sample and detection reagent. Make sure the stabilizer is pipetted up and down several times to ensure thorough mixing.
  5. I would like to measure the conversion of pyrophosphate to phosphate. Can I use the PiColorLock Gold Phosphate Detection System for this purpose?
    • Yes, only the phosphate will give a signal; pyrophosphate will not.

Additional GTPase Products

GTPase 602-0121

Blogs on GTPase.

Understanding OPA1 and Mitochondrial Function
OPA1 belongs to the Dynamin large GTPase protein family. OPA1 exists as a single-pass membrane protein localized in the mitochondrial inner membrane and also as a soluble form in the mitochondrial intermembrane space. There, it is a key player in fusi...  Read full blog post.

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