5LGY

Lysine 120-acetylated P53 DNA binding domain in a complex with the BAX response element.

Replaces:  5BUB

Summary for 5LGY

• Entry DOI: 10.2210/pdb5lgy/pdb
• Descriptor: Cellular tumor antigen p53, DNA (5'-D(*TP*CP*AP*CP*AP*AP*GP*TP*TP*AP*GP*AP*GP*AP*CP*AP*AP*GP*CP*CP*T)-3'), DNA (5'-D(*AP*GP*GP*CP*TP*TP*GP*TP*CP*TP*CP*TP*AP*AP*CP*TP*TP*GP*TP*GP*A)-3'), ... (5 entities in total)
• Functional Keywords: transcription, acetylation, transcription factor, post-translational modification, tumor suppressor, dna binding specificity, apoptosis, induced fit, genetic code expansion
• Biological source: Homo sapiens (Human); More
• Total number of polymer chains: 6
• Total formula weight: 102587.53

Authors

Arbely, E.,Vainer, R. (deposition date: 2016-07-08, release date: 2016-07-27, Last modification date: 2025-10-01)

Primary citation

Vainer, R.,Cohen, S.,Shahar, A.,Zarivach, R.,Arbely, E.
Structural Basis for p53 Lys120-Acetylation-Dependent DNA-Binding Mode.
J.Mol.Biol., 428:3013-3025, 2016

PubMed Abstract: Normal cellular homeostasis depends on tight regulation of gene expression, which requires the modulation of transcription factors' DNA-binding specificity. That said, the mechanisms that allow transcription factors to distinguish between closely related response elements following different cellular signals are not fully understood. In the tumor suppressor protein p53, acetylation of loop L1 residue Lys120 within the DNA-binding domain has been shown to promote the transcription of proapoptotic genes such as bax. Here, we report the crystal structures of Lys120-acetylated p53 DNA-binding domain in complex with a consensus response element and with the natural BAX response element. Our structural analyses reveal that Lys120 acetylation expands the conformational space of loop L1 in the DNA-bound state. Loop L1 flexibility is known to increase p53's DNA-binding specificity, and Lys120-acetylation-dependent conformational changes in loop L1 enable the formation of sequence-dependent DNA-binding modes for p53. Furthermore, binding to the natural BAX response element is accompanied by global conformational changes, deformation of the DNA helical structure, and formation of an asymmetric tetrameric complex. Based on these findings, we suggest a model for p53's Lys120 acetylation-dependent DNA-binding mode.

PubMed: 27338200
DOI: 10.1016/j.jmb.2016.06.009

Experimental method

X-RAY DIFFRACTION (2.92 Å)