Tumor protein p53, a nuclear protein, plays an essential role in the regulation of cell cycle, specifically in the transition from G0 to G1. It is found in very low levels in normal cells, however, in a variety of transformed cell lines, it is expressed in high amounts, and believed to contribute to transformation and malignancy. p53 is a DNA-binding protein containing DNA-binding, oligomerization and transcription activation domains. It is postulated to bind as a tetramer to a p53-binding site and activate expression of downstream genes that inhibit growth and/or invasion, and thus function as a tumor suppressor.(1-5) Mutants of p53 that frequently occur in a number of different human cancers fail to bind the consensus DNA binding site, hence cause the loss of tumor suppressor activityis and highly correlated with tumorigenesis.(6, 7)

The wild type His tagged p53 (393 amino acids) was expressed in a baculovirus system and purified by affinity and FPLC chromatography.

Recombinant p53 can be used for:
1) gel mobility shift assay or for a DNase I footprinting assay in the presence of double stranded DNA containing a consensus p53-binding sequence [5’-PuPuPuC(A/T)(T/A)GPyPyPy-3’]
2) in vitro transcription assay
3) protein-protein interaction assay
4) for cell growth assay.

Purified protein is greater than 95% homogeneous based on SDS-PAGE gel analysis.
1 unit equals 1 nanogram of purified protein. 1 unit is sufficient for a gel mobility shift assay in a 20 µl reaction; 50 units are sufficient for reconstituted transcription assay and 100 units are sufficient for a protein-protein interaction assay.

variable in different lots
1x dilution buffer A: 20 mM Tris-Cl (pH 8.0), 20% Glycerol, 100 mM KCl, 1 mM DTT and 0.2 mM EDTA

References:
1. Finlay, C. et al., (1989) Cell 57, 1083-1093
2. Michalovitz, D. et al., (1990) Cell 62, 671-680
3. Baker, S. et al., (1990) Science 249, 912-915
4. Fields, S. et.al., (1990) Science 249, 1046-1049
5. Raycroft, L. et al., (1990) Science 249, 1049-1051
6. Hollstein, M. et al., (1991) Science 253, 49-53
7. Bennett, W. et al., (1992) Chest 101, 19S-20S
8. Xu et al., (2005) Nat Cell Bio, 7:165-171

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This products is recommended For RESEARCH USE ONLY and is Not qualified for Use in Diagnostic or Therapeutic Procedures.