A conserved mechanism for binding of p53 DNA-binding domain and anti-apoptotic Bcl-2 family proteins

Mol Cells. 2014 Mar;37(3):264-9. doi: 10.14348/molcells.2014.0001. Epub 2014 Mar 14.

Abstract

The molecular interaction between tumor suppressor p53 and the anti-apoptotic Bcl-2 family proteins plays an essential role in the transcription-independent apoptotic pathway of p53. In this study, we investigated the binding of p53 DNA-binding domain (p53DBD) with the anti-apoptotic Bcl-2 family proteins, Bcl-w, Mcl-1, and Bcl-2, using GST pull-down assay and NMR spectroscopy. The GST pull-down assays and NMR experiments demonstrated the direct binding of the p53DBD with Bcl-w, Mcl-1, and Bcl-2. Further, NMR chemical shift perturbation data showed that Bcl-w and Mcl-1 bind to the positively charged DNA-binding surface of p53DBD. Noticeably, the refined structural models of the complexes between p53DBD and Bcl-w, Mcl-1, and Bcl-2 showed that the binding mode of p53DBD is highly conserved among the anti-apoptotic Bcl-2 family proteins. Furthermore, the chemical shift perturbations on Bcl-w, Mcl-1, and Bcl-2 induced by p53DBD binding occurred not only at the p53DBD-binding acidic region but also at the BH3 peptide-binding pocket, which suggests an allosteric conformational change similar to that observed in Bcl-XL. Taken altogether, our results revealed a structural basis for a conserved binding mechanism between p53DBD and the anti-apoptotic Bcl-2 family proteins, which shed light on to the molecular understanding of the transcription-independent apoptosis pathway of p53.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Allosteric Regulation
  • Apoptosis Regulatory Proteins / chemistry
  • Apoptosis Regulatory Proteins / physiology
  • Cell Line
  • Humans
  • Models, Molecular
  • Myeloid Cell Leukemia Sequence 1 Protein / chemistry*
  • Myeloid Cell Leukemia Sequence 1 Protein / physiology
  • Nuclear Magnetic Resonance, Biomolecular
  • Peptide Mapping
  • Protein Binding
  • Protein Interaction Domains and Motifs
  • Protein Structure, Quaternary
  • Protein Structure, Secondary
  • Proto-Oncogene Proteins c-bcl-2 / chemistry*
  • Proto-Oncogene Proteins c-bcl-2 / physiology
  • Tumor Suppressor Protein p53 / chemistry*
  • Tumor Suppressor Protein p53 / physiology

Substances

  • Apoptosis Regulatory Proteins
  • BCL2L2 protein, human
  • MCL1 protein, human
  • Myeloid Cell Leukemia Sequence 1 Protein
  • Proto-Oncogene Proteins c-bcl-2
  • TP53 protein, human
  • Tumor Suppressor Protein p53