Multiple conformations of full-length p53 detected with single-molecule fluorescence resonance energy transfer.

Proceedings of the National Academy of Sciences of the United States of America
Fang HuangAlan R Fersht

Abstract

The tumor suppressor p53 is a member of the emerging class of proteins that have both folded and intrinsically disordered domains, which are a challenge to structural biology. Its N-terminal domain (NTD) is linked to a folded core domain, which has a disordered link to the folded tetramerization domain, which is followed by a disordered C-terminal domain. The quaternary structure of human p53 has been solved by a combination of NMR spectroscopy, electron microscopy, and small-angle X-ray scattering (SAXS), and the NTD ensemble structure has been solved by NMR and SAXS. The murine p53 is reported to have a different quaternary structure, with the N and C termini interacting. Here, we used single-molecule FRET (SM-FRET) and ensemble FRET to investigate the conformational dynamics of the NTD of p53 in isolation and in the context of tetrameric full-length p53 (flp53). Our results showed that the isolated NTD was extended in solution with a strong preference for residues 66-86 forming a polyproline II conformation. The NTD associated weakly with the DNA binding domain of p53, but not the C termini. We detected multiple conformations in flp53 that were likely to result from the interactions of NTD with the DNA binding domain of each...Continue Reading

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