Skip to main content

HTRF Streptavidin-Tb cryptate, 5,000 Assay Points

Tb cryptate-labeled Streptavidin for capturing biotinylated proteins, peptides, antibodies, small molecules, nucleic acids....

For research use only. Not for use in diagnostic procedures.
Part Number: 610SATLF
Unit Size: 1,000 Assay Points
Part Number: 610SATLA
Unit Size: 5,000 Assay Points
Part Number: 610SATLB
Unit Size: 20,000 Assay Points
  • Streptavidin has been labeled with Tb crypate. Biotin binds to Streptavidin with high affinity (Ka=1015M-1). The binding is rapid and stable, making it an ideal choice for use in a variety of assays such as enzyme assays, protein-protein binding assays and molecular biology assays.

  • Assay Points
    5000
    Assay Target Type
    Fluorescent reagent
    Assay Technology
    HTRF
    Brand
    HTRF
    Quantity
    1
    Therapeutic Area
    Cardiovascular
    Infectious Diseases
    Inflammation
    Metabolism/Diabetes
    NASH/Fibrosis
    Neuroscience
    Oncology & Inflammation
    Rare Diseases
    Unit Size
    5,000 Assay Points
  • Assay principle

    In an HTRF interaction assay, one partner is labeled (directly or indirectly) with the donor, and the other with the acceptor (again, directly or indirectly). The intensity of the signal is proportional to the binding of the 2 partners. In the example shown here: Streptavidin-Tb cryptate binds to the biotinylated tagged partner A while partner B* binds to a specific Ab labeled with an HTRF acceptor. *partner B can also be biotinylated, tagged, Fc fused. In these cases, use the corresponding HTRF reagent (anti-Tag, anti-species, protA, Streptavidin) labeled with acceptor for the detection.

    Assay principle htrf streptavidin-tb cryptate
    Assay protocol

    The example on the right describes the protocol using a 20 µL final assay volume for detecting an interaction between a biotinylated-tagged partner A and a non-tagged partner B*. Dispense the 2 partners (10 µL), incubate, add Streptavidin-Tb cryptate (5 µL) and anti-partner B labeled with acceptor (5 µL), incubate and read. *partner B can also be tagged, Fc fused or directly labeled. In these cases use for the detection, the corresponding HTRF reagent (anti-Tag, anti species, protA, Streptavidin), labeled with donor.

    Assay protocol htrf streptavidin-tb cryptate
  • How do the number of tests relate to active moiety?

    The average conjugate quantity per well reflects overall biological material content. Using the active moiety amount is generally preferred to the quantity of total conjugate. For Cryptate and d2 conjugates, the total conjugate amount equals that of the active moiety, since the molecular weight of the label is negligible. This is not the case for XL665 labeled entities for which the quantity of total conjugate will vary depending on the final molar ratio of the XL665 conjugate, however, the amount of active moiety, provided by Revvity, is constant and based on the number of tests ordered.

    Assay specifications
    Description Active Moiety/5,000 tests
    Streptavidin Tb 4 µg

     

    Recommended quantities of Cryptate and XL665 conjugates

    Cryptate conjugates must not be excessive in order to prevent reader saturation and an unacceptable level of background. In most cases, a cryptate concentration of 1 to 5nM is appropriate, and will generate 20,000 to 80,000 cps at 620 nm depending on the HTRF compatible reader used. The XL665 conjugate must match its assay counterpart as closely as possible in order for the maximum number of biomolecules to be tagged with the XL665 acceptor. Thus, to detect a tagged molecule at an assay concentration of 20nM, the concentration of anti-Tag-XL665 should be equimolar or higher.

Resources

1-1 of 1 Resources
Guide
HTRF solutions, guide to major applications

This guide provides you an overview of HTRF applications in several therapeutic areas.