TransAM® Kits are DNA-binding ELISAs that facilitate the study of transcription factor activation in mammalian tissue and cell extracts. Assays are available for over 40 different targets (see the list at right). Each kit includes a 96-stripwell plate in which multiple copies of a specific double-stranded oligonucleotide have been immobilized. When nuclear or whole-cell extract is added, activated transcription factor of interest binds the oligonucleotide at its consensus binding site and is quantified using the included antibody, which is specific for the bound, active form of the transcription factor being studied. For complete details, click the TransAM® Method tab below.
TransAM® Sp1 Transcription Factor ELISA Kits
TransAM Sp1 and TransAM Sp1/Sp3 Kits provide everything needed to study activated Sp1 or Sp1/Sp3, including a positive control extract. The Sp1 and Sp1/Sp3 kits can be used with human, mouse and rat extracts. Recombinant Sp1 protein is available separately to generate an optional protein standard curve in the TransAM Sp1 and Sp1/Sp3 Transcription Factor ELISA kits. Click the Sp1 Info tab below for data and more information; kit manuals can be downloaded under the Documents tab.
Sp1 Transcription Factor Info
Sp1 was one of the first cellular transcription factors to be identified, cloned and characterized for its ability to bind to GC-boxes in regulatory promoter elements. Sp1 has always been described as a ubiquitous transcription factor that is required for the constitutive and inducible expression of a variety of genes, such as in the cell cycle and in mammalian development. Sp3 belongs to a family of Sp1-related genes that can bind GC- and GT-box regulatory elements to either activator or repress transcription.
Figure 1: Monitoring Sp1 and Sp3 activity with the TransAM Sp1/Sp3 Kit.
Different amounts of untreated and H2O2-post treated nuclear extracts from MCF-7 cells are tested for Sp1 and Sp3 activity using the TransAM Sp1/Sp3 Kit.
The TransAM® transcription factor ELISA advantage
Historically, transcription factor studies have been conducted using gelshift, Western blot and reporter plasmid transfections, which are time-consuming, do not allow for high-throughput and provide only semi-quantitative results. TransAM assays are up to 100 times more sensitive than gelshift techniques, and can be completed in less than 5 hours. Because TransAM is an ELISA-based assay*, there is no radioactivity, and the high-throughput stripwell format enables simultaneous screening of 1-96 samples. Inconsistencies due to variable reporter plasmid transfections are eliminated, along with the need to construct stable cell lines.
Why use TransAM® transcription factor ELISAs?
- Up to 100-fold more sensitive than gelshift assays
- Eliminates the use of radioactivity and the need to run gels
- Results in less than five hours
- Colorimetric readout enables easy, quantitative analysis with spectrophotometry at 450 nm
- 96-stripwell format enables both high and low throughput