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Lumit™ Immunoassays

Lumit™ Immunoassays provide a simple and fast alternative to conventional immunoassay methods including sandwich ELISAs and Western blots. Lumit™ assays are sensitive, have broad dynamic range and can be completed in as little as 30 minutes, making them a compelling alternative to labor-intensive ELISA and Western blot methods. 

Advantages of Lumit™ Assays over conventional immunoassays include:

  • Simple add-mix-read protocol with no washing steps
  • Direct analyte measurement in the cell culture plate or on medium removed from the cells
  • No immobilization to plates, beads or other surfaces required
  • Sensitive luminescence detection with wide dynamic range

Lumit™ Assays are available as catalog items, early-access materials or by custom order. Early-access materials include labeling and detection reagents that allow you to label antibodies and proteins with SmBiT and LgBiT and develop your own immunoassays, and pre-built immunoassays for detection of specific targets. See the product pages below for specifics on each assay type.

Get Up to $500 of Free Promega Reagents with our Back to the Bench Program. Register Now ›

How Lumit™ Immunoassays Work

Lumit™ Immunoassays are based on NanoLuc® Binary Technology (NanoBiT®). In Lumit™ Immunoassays, antibodies are chemically labeled with the small and large subunits of NanoLuc® Luciferase, known as SmBiT and LgBiT, respectively. In the presence of an analyte, the two antibodies come into close proximity, allowing SmBiT and LgBiT to form an active enzyme and generate a bright luminescence signal.

This presentation from SLAS 2020 discusses the principle and applications of Lumit™ Immunoassays.

Watch Video
Lumit Immunoassay principle.

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Lumit™ Immunoassays Available by Custom Order

In addition to the early-access materials listed above, we offer consultation on development of customized Lumit™ Assays. Please contact us to discuss at the link below to discuss development of a custom solution.  

Request a Consult

What are Lumit™ Immunoassays?

Lumit™ Immunoassays are based on the chemical labeling of antibodies and proteins with SmBiT and LgBiT using HaloTag® technology. In the presence of an analyte, the two antibodies come into close-proximity and allow SmBiT and LgBiT to form an active enzyme and generate a bright luminescence signal proportional to analyte concentration. They provide a fast alternative to traditional immunoassays, such as ELISA and Western blotting.

Lumit immunoassays detect antigens with a simple light signal 16530ma-w

The Lumit™ Immunoassay Labeling Kit is used to label pairs of antibodies to create Lumit™ Assays. Lumit™ Detection Reagents and pre-labeled LgBiT and SmBiT secondary antibody conjugates are also available. 

Lumit™  Immunoassays for cytokine detection quantitatively measure target analytes in cell culture samples with a simple, no-wash assay protocol. The assays can be performed directly on cell culture samples or on medium transferred from cell plates.

In the Lumit™ Immunoassay Cellular System, the LgBiT and SmBiT subunits are conjugated to a pair of secondary antibodies from two different species. In a multiwell plate, seeded cells are lysed using a NanoBiT®-compatible lysis buffer (digitonin), and the target protein is detected by adding an antibody mix containing two primary antibodies against the protein along with the SmBiT- and LgBiT-conjugated secondary antibodies.

The Lumit™ FcRn Binding Immunoassay is a competition assay to measure the interaction between human FcRn and Fc proteins, including antibodies. A Human IgG1 labeled with LgBiT (Tracer-LgBiT) is used as the tracer. A C-terminal biotinylated human FcRn bound to Streptavidin-SmBiT is used as the target. In the absence of an antibody analyte sample, Tracer-LgBiT binds to the hFcRn-SmBiT target resulting in maximum luminescence signal. Unlabeled IgG will compete with Tracer-LgBiT for binding to the FcRn target, resulting in a concentration dependent decrease in luminescent signal.