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Purification of acetyl-p53 using p300 co-infection and the baculovirus expression system
Landon G Piluso1, Gang Wei, Andrew G Li
1Department of Biochemistry, University of California, Riverside CA 92521, USA.
Abstract:
As cells persist in their environment, they are exposed to harmful agents that can damage their genomic DNA. When DNA becomes damaged, p53, a tumor suppressor, is stabilized and acts as a transcription factor to cause either cell cycle arrest or apoptosis. Strict p53 regulatory mechanisms have been well characterized relative to phosphorylation and dephosphorylation, but acetylation of p53 in response to DNA damage has also been shown to participate in p53 function. Proper investigation of the many roles that acetylated p53 plays in the cell requires accurate in vitro studies, which can only be easily conducted if highly pure acetyl-p53 is available. Purified p53 that is acetylated in vitro can routinely achieve 10-20%. Separating this acetylated fraction from the undesired unacetylated fraction can be technically challenging, inefficient, and time consuming. We have developed an in vivo strategy to rapidly produce microgram quantities of p53 preparations that are greater than 60% acetylated using co-infection of p53 and p300 baculoviruses in Sf21 insect cell culture. Immunoaffinity recovery followed by further depletion of unacetylated p53 results in a preparation that is greater than 70-75% in acetyl-p53 after a single round, and undetectable levels of unacetylated p53 after two rounds. This approach to preparing acetylated protein in vivo may also extend to other acetylated transcription factors and histones.
Insights
Researchers developed a novel in vivo method to produce highly pure acetylated p53, a crucial tumor suppressor protein. This technique overcomes challenges in obtaining sufficient quantities of acetyl-p53 for accurate cellular studies.
Area of Science:
- Molecular Biology
- Cellular Biology
- Biochemistry
Background:
- DNA damage triggers p53 stabilization, a tumor suppressor that regulates cell cycle arrest and apoptosis.
- While p53 phosphorylation is well-studied, its acetylation in response to DNA damage also impacts function.
- Accurate in vitro studies necessitate highly pure acetylated p53, which is difficult to obtain using conventional methods.
Purpose of the Study:
- To develop an efficient strategy for producing high-purity acetylated p53 in vitro.
- To overcome the technical challenges and inefficiencies associated with current methods for purifying acetyl-p53.
Main Methods:
- Co-infection of p53 and p300 baculoviruses in Sf21 insect cell culture.
- Immunoaffinity recovery of acetylated p53.
- Depletion of unacetylated p53.
Main Results:
- Developed an in vivo strategy to rapidly produce microgram quantities of p53 with over 60% acetylation.
- Achieved >70-75% acetyl-p53 purity after one round of immunoaffinity recovery and depletion.
- Attained undetectable levels of unacetylated p53 after two rounds of purification.
Conclusions:
- The developed in vivo method provides a rapid and efficient way to produce highly pure acetylated p53.
- This approach may be applicable to the preparation of other acetylated proteins, including transcription factors and histones.
- Facilitates further investigation into the roles of acetylated p53 in cellular processes.
