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Long-range regulation of p53 DNA binding by its intrinsically disordered N-terminal transactivation domain

Krois, Alexander S., Dyson, H. Jane, Wright, Peter E.·2018·Proceedings of the National Academy of Sciences
DOI 10.1073/pnas.1814051115
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Abstract

Atomic resolution characterization of the full-length p53 tetramer has been hampered by its size and the presence of extensive intrinsically disordered regions at both the N and C termini. As a consequence, the structural characteristics and dynamics of the disordered regions are poorly understood within the context of the intact p53 tetramer. Here we apply trans -intein splicing to generate segmentally 15 N-labeled full-length p53 constructs in which only the resonances of the N-terminal transactivation domain (NTAD) are visible in NMR spectra, allowing us to observe this region of p53 with unprecedented detail within the tetramer. The N-terminal region is dynamically disordered in the full-length p53 tetramer, fluctuating between states in which it is free and fully exposed to solvent and states in which it makes transient contacts with the DNA-binding domain (DBD). Chemical-shift changes and paramagnetic spin-labeling experiments reveal that the amphipathic AD1 and AD2 motifs of the NTAD interact with the DNA-binding surface of the DBD through primarily electrostatic interactions. Importantly, this interaction inhibits binding of nonspecific DNA to the DBD while having no effect on binding to a specific p53 recognition element. We conclude that the NTAD:DBD interaction functions to enhance selectivity toward target genes by inhibiting binding to nonspecific sites in genomic DNA. This work provides some of the highest-resolution data on the disordered N terminus of the nearly 180-kDa full-length p53 tetramer and demonstrates a regulatory mechanism by which the N terminus of p53 transiently interacts with the DBD to enhance target site discrimination.

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Metadata

Authors
Krois, A. S., Dyson, H. J., & Wright, P. E.
Venue
Proceedings of the National Academy of Sciences
Publisher
National Academy of Sciences
Published
2018-11-12
Volume
115
Issue
48
ISSN
  • 0027-8424
  • 1091-6490
DOI
10.1073/pnas.1814051115
Cited by
143
References
5
Language
en
Licence
www.pnas.org/site/aboutpnas/licenses.xhtml (vor, 181 d)
Funders
  • HHS | NIH | National Cancer Institute (CA096865)
  • HHS | NIH | National Institute of General Medical Sciences (GM075995)

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Krois, A. S., Dyson, H. J., & Wright, P. E. (2018). Long-range regulation of p53 DNA binding by its intrinsically disordered N-terminal transactivation domain. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1814051115

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