Abstract
As a “genomic guardian”, p53 mainly functions as a transcription factor that regulates downstream targets responsible for cell fate control, and the activity of p53 is tightly regulated by a complex network that include an abundance of post-translational modifications. Notably, acetylation of p53 at many positions has been demonstrated to play a major role in accurate p53 regulation and cell fate determination. However, no evidence has been provided to compare the effect of acetylation at different sites on p53 regulation. Here, we constructed six acetylation-defective p53 mutants that lysine was substituted by arginine at residues 120, 164, 305, 320, 370/372/373 or 381/382/386, respectively, and determined their effects on p53 activity systematically. Our results showed that all six mutants exhibited diminished transactivation ability and selective regulation of target genes expression through distinct mechanisms. Specifically, lysine 370/372/373 and 381/382/386 mutations decreased p53 stability, and lysine 305 mutation reduced p53 phosphorylation level at serine 15, while lysine 120 and 164 mutations decreased p53 acetylation level at lysine 382. Collectively, these data indicate that acetylation of p53 at different sites has diverse regulatory effects on p53 transcriptional activity through different mechanisms.
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Abbreviations
- PTM:
-
Post-translational modifications
- HATs:
-
Histone/lysine acetyltransferases
- CTD:
-
C-terminal domain
- PCAF:
-
p300/CBP associated factor
- K120:
-
Lysine 120
- K164:
-
Lysine 164
- K305:
-
Lysine 305
- K320:
-
Lysine 320
- K382/383:
-
Lysine 382/383
- S15:
-
Serine 15
- pG13-Luc:
-
pG13L containing 13 tandem p53 binding site repeats
- K120R:
-
Mutants with lysine to arginine changes at residues 120
- K164R:
-
Mutants with lysine to arginine changes at residues 164
- K305R:
-
Mutants with lysine to arginine changes at residues 305
- K320R:
-
Mutants with lysine to arginine changes at residues 320
- K370/372/373R:
-
Mutants with lysine to arginine changes at residues 370/372/373
- K381/382/386R:
-
Mutants with lysine to arginine changes at residues 381/382/386
- CHX:
-
Cycloheximide
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Acknowledgements
We thank Dr. Bert Vogelstein (Johns Hopkins University) for providing the luciferase reporter plasmid pG13-Luc, Dr. Lingqiang Zhang (Beijing Institute of Lifeomics) for Human lung adenocarcinoma H1299 cell line.
Funding
This work was partially supported by grants from the National Natural Science Foundation Projects (31270799, 31771563), the National Key Research and Development Program of China (2017YFA0505700), the Chinese Program of International S&T Cooperation (2014DFB30020), and National Modern Agro (Dairy) Industry and Technology System (CARS-37).
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C.T. and J.W. conceived the project and designed the experiments. The experiments were performed by Y.W., Y.C., X.Z., Q.C., and H.W. Data were analyzed by C.T., J.W., Y.C. and Z.W. C.T. wrote the manuscript. Z.W. and J.W. provided critical proof reading of the manuscript.
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Wang, Y., Chen, Y., Chen, Q. et al. The role of acetylation sites in the regulation of p53 activity. Mol Biol Rep 47, 381–391 (2020). https://doi.org/10.1007/s11033-019-05141-7
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DOI: https://doi.org/10.1007/s11033-019-05141-7