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HIS Lite™ iFluor® 568 Tris NTA-Ni Complex

Fluorescent tris-NTA compounds provide an efficient method for site-specific and stable noncovalent fluorescence labeling of polyhistidine-tagged proteins. In contrast to the transient binding of conventional mono-NTA, the multivalent interaction of tris-NTA conjugated fluorophores form a much more stable complex with polyhistidine-tagged proteins. The high selectivity of tris-NTA compounds toward cumulated histidines enable the selective labeling of proteins in cell lysates and on the surface of live cells. Fluorescent tris-NTA conjugates can be applied for the analysis of a ternary protein complex in solution and on surfaces. The transition metal ions (e.g., Ni ion)-mediated complexation of polyhistidine-labeled proteins with fluorescent tris-NTA conjugates provides a sensitive reporter for detecting and monitoring protein-protein interactions in real time. This iFluor® 568 Tris NTA compound is used as an sensitive fluorescent probe for detecting polyhistidine-labeled proteins in cells, solution and solid surfaces. In combination with OG488-tris-NTA compound it can be used for multicolor analysis of polyhistidine-tagged proteins.

Example protocol

PREPARATION OF STOCK SOLUTIONS

Unless otherwise noted, all unused stock solutions should be divided into single-use aliquots and stored at -20 °C after preparation. Avoid repeated freeze-thaw cycles

HIS Lite™ iFluor® 568 Tris NTA-Ni Complex Stock Solution
  1. Prepare a 5 to 10 mM stock solution by adding an appropriate amount of ddH2O.

    Note: Store any unused stock solution at -20 °C. Avoid repeated freeze-thaw cycles and minimize light exposure.

PREPARATION OF WORKING SOLUTION

HIS Lite™ iFluor® 568 Tris NTA-Ni Complex Working Solution
  1. Prepare a 1 to 10 µM HIS Lite™ iFluor® 568 Tris NTA-Ni Complex working solution in PBS.

    Note: Ensure that there is sufficient working solution to fully submerge the gel. After use, discard the working solution. Do not reuse.

SAMPLE EXPERIMENTAL PROTOCOL

The following protocol should be used only as a guideline and may require optimization to better suit your specific experimental needs.

Post-run Gel Staining Protocol
  1. Run gels based on your standard protocol.

  2. Place the gel in a suitable container. Fix the gel in the fixing solution for 60 minutes. Note: 40% ethanol + 10% acetic acid can be used as a fixing solution.

  3. Wash the gel twice with the ultra-pure water.

  4. Incubate the gel in the HIS Lite™ iFluor® 568 Tris NTA-Ni Complex working solution for 60 minutes.

    Note: Be sure to fully submerge the gel in the working solution.

  5. Remove the working solution and wash the gel twice with PBS.

  6. Proceed to imaging the gel immediately.

For In Vitro Complex Formation
  1. Mix the His-tagged protein solution and the HIS Lite™ iFluor® 568 Tris NTA-Ni Complex working solution at the appropriate concentrations.

    Note: Optimization of the HIS Lite™ iFluor® 568 Tris NTA-Ni Complex to the His-tagged protein mix must be performed for better labeling.

    Note: 1 to 10 µM of HIS Lite™ iFluor® 568 Tris NTA-Ni Complex can be used as a starting concentration.

    Note: The reaction can be performed in a buffer containing 50 mM HEPES/KOH, pH 7.4, 100 mM KCl, 1 mM MgCl2, 2 mM β-mercaptoethanol, 5% glycerol, or a buffer of your choice.

  2. Mix can be incubated for 30 minutes at room temperature or 4 ℃.

    Note: Optimization of the incubation time and conditions must be performed for better labeling

  3. Mix can then be subjected to column purification or any other downstream process.

Calculators

Common stock solution preparation

Table 1. Volume of Water needed to reconstitute specific mass of HIS Lite™ iFluor® 568 Tris NTA-Ni Complex to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

0.1 mg0.5 mg1 mg5 mg10 mg
1 mM51.643 µL258.215 µL516.43 µL2.582 mL5.164 mL
5 mM10.329 µL51.643 µL103.286 µL516.43 µL1.033 mL
10 mM5.164 µL25.822 µL51.643 µL258.215 µL516.43 µL

Molarity calculator

Enter any two values (mass, volume, concentration) to calculate the third.

Mass (Calculate)Molecular weightVolume (Calculate)Concentration (Calculate)Moles
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Spectrum

Product family

NameExcitation (nm)Emission (nm)
HIS Lite™ iFluor® 647 Tris NTA-Ni Complex648668

Citations

View all 24 citations: Citation Explorer
Selective binding, magnetic separation and purification of histidine-tagged protein using biopolymer magnetic core-shell nanoparticles
Authors: Zhou, Y., Yan, D., Yuan, S., Chen, Y., Fletcher, E. E., Shi, H., Han, B.
Journal: Protein Expr Purif (2018): 5-11
Quantification of Histidine-Rich Protein 3 of Plasmodium falciparum
Authors: Palani, B.
Journal: Monoclon Antib Immunodiagn Immunother (2018): 87-90
A novel reverse micellar purification strategy for histidine tagged human interferon gamma (hIFN-gamma) protein from Pichia pastoris
Authors: Prabhu, A. A., Purkayastha, A., M and al, B., Kumar, J. P., M and al, B. B., Veeranki, V. D.
Journal: Int J Biol Macromol (2018): 2512-2524
Label-Free Direct Electrical Detection of a Histidine-Rich Protein with Sub-Femtomolar Sensitivity using an Organic Field-Effect Transistor
Authors: Minamiki, T., Sasaki, Y., Tokito, S., Minami, T.
Journal: ChemistryOpen (2017): 472-475
Controlling Protein Surface Orientation by Strategic Placement of Oligo-Histidine Tags
Authors: Wasserberg, D., Cabanas-Danes, J., Prangsma, J., O'Mahony, S., Cazade, P. A., Tromp, E., Blum, C., Thompson, D., Huskens, J., Subramaniam, V., Jonkheijm, P.
Journal: ACS Nano (2017): 9068-9083
Page updated on December 17, 2024

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Catalog Number12617
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Physical properties

Molecular weight

1936.37

Solvent

Water

Spectral properties

Correction Factor (260 nm)

0.34

Correction Factor (280 nm)

0.15

Extinction coefficient (cm -1 M -1)

1000001

Excitation (nm)

568

Emission (nm)

587

Quantum yield

0.571

Storage, safety and handling

Intended useResearch Use Only (RUO)

Storage

Freeze (< -15 °C); Minimize light exposure

Platform

Gel Imager

ExcitationGreen laser
Emission602, 50 nm
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