PerkinElmer
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AlphaScreen Protein A Acceptor beads, 25 mg

AlphaScreen Acceptor beads conjugated to Protein A.

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For research use only. Not for use in diagnostic procedures.

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These beads can be used to capture antibodies that bind Protein A, and can be used in conjunction with Alpha Donor beads to create AlphaScreen no-wash immunoassays for:

  • Analyte detection assays
  • Biomarker detection assays
  • Clone selection assays
  • Protein-protein interaction assays
  • Other immunoassays

In a typical Alpha assay, 1 mg of AlphaScreen Acceptor beads is sufficient to run 1,000-2,000 wells using a 50 µL final reaction volume. Bead concentration can be adjusted for optimal performance.

AlphaScreen® and AlphaLISA® are bead-based assay technologies used to study biomolecular interactions in a microplate format. The acronym ""Alpha"" stands for amplified luminescent proximity homogeneous assay. As the name implies, some of the key features of these technologies are that they are non-radioactive, homogeneous proximity assays. Binding of molecules captured on the beads leads to an energy transfer from one bead to the other, ultimately producing a luminescent/fluorescent signal. To understand how a signal is produced, one must begin with an understanding of the beads. AlphaScreen and AlphaLISA assays require two bead types: Donor beads and Acceptor beads. Each bead type contains a different proprietary mixture of chemicals, which are key elements of the AlphaScreen technology. Donor beads contain a photosensitizer, phthalocyanine, which converts ambient oxygen to an excited and reactive form of O2, singlet oxygen, upon illumination at 680 nm. Please note that singlet oxygen is not a radical; it is molecular oxygen with a single excited electron. Like other excited molecules, singlet oxygen has a limited lifetime prior to falling back to ground state. Within its 4 µsec half-life, singlet oxygen can diffuse approximately 200 nm in solution. If an Acceptor bead is within that proximity, energy is transferred from the singlet oxygen to thioxene derivatives within the Acceptor bead, subsequently culminating in light production at 520-620 nm (AlphaScreen) or at 615 nm (AlphaLISA). In the absence of an Acceptor bead, singlet oxygen falls to ground state and no signal is produced. This proximity-dependent chemical energy transfer is the basis for AlphaScreen's homogeneous nature.

Specifications

Antibody Conjugates Protein A
Automation Compatible Yes
Bead Type or Core Bead Type AlphaScreen Acceptor
Product Brand Name AlphaScreen
Shipping Condition Blue Ice
Unit Size 25 mg
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Brochure

Alpha Technology Solutions

Product brochure for the Alpha Technology, a versatile, no wash, homogeneous assay technology that's suitable for a broad range of applications.

PDF 4 MB
Handle Large Biomolecular Interactions With Ease

The interactions and bindingof proteins are implicated in a large number of biological processes. The needfor an efficient, highly sensitive assay to study large protein interactions is increasingly important. Alpha Technology is a highly flexible, homogeneous, no-wash assay ideal for the measurement of protein interactions and complexes as large as 200 nm in size

PDF 798 KB

Guide

Alpha Protein-Protein Interaction Quick Start Guide

Alpha has been used to study a wide variety of interactions, including protein:protein, protein:peptide, protein:DNA, protein:RNA, protein:carbohydrate, protein:small molecule, receptor:ligand, and nuclear receptor:ligand interactions. Both cell-based and biochemical interactions have been monitored, and applications such as phage display, ELISA, and EMSA (electrophoretic mobility shift assay) have been adapted to Alpha.

PDF 380 KB
ELISA to AlphaLISA Immunoassay Conversion Guide

This guide presents the simple conversion of an ELISA or other immunoassay to an AlphaLISA® immunoassay.

PDF 1 MB
User's Guide To Alpha Assays Protein:Protein Interactions

AlphaScreen® and AlphaLISA® are bead-based assay technologies used to study biomolecular interactions in a microplate format. The acronym “Alpha” stands for Amplified Luminescent Proximity Homogeneous Assay. The assay does not require any washing steps. Binding of proteins or other binding partners captured on the beads leads to an energy transfer from one bead to the other, ultimately producing a luminescent signal.

PDF 3 MB