Volume 84, Issue 10 pp. 1443-1461
Article

Reactivation of mutant p53: Constraints on mechanism highlighted by principal component analysis of the DNA binding domain

Zahra Ouaray

Zahra Ouaray

School of Chemistry, University of Southampton, Southampton, SO17 1BJ United Kingdom

Bioinformatics Institute, Agency for Science, Technology and Research, Singapore, 138671 Singapore

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Karim M. ElSawy

Karim M. ElSawy

York Centre for Complex Systems Analysis (YCCSA), University of York, York, YO10 5GE United Kingdom

Department of Chemistry, College of Science, Qassim University, Buraydah, 52571 Saudi Arabia

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David P. Lane

David P. Lane

p53 Laboratory, Agency for Science, Technology and Research, Singapore, 138648 Singapore

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Jonathan W. Essex

Corresponding Author

Jonathan W. Essex

School of Chemistry, University of Southampton, Southampton, SO17 1BJ United Kingdom

Correspondence to: Jonathan W. Essex, School of Chemistry, University of Southampton, Southampton, SO17 1BJ, United Kingdom. Chandra Verma, Bioinformatics Institute (A*STAR), Singapore 138671.E-mail: [email protected]; [email protected]Search for more papers by this author
Chandra Verma

Chandra Verma

Bioinformatics Institute, Agency for Science, Technology and Research, Singapore, 138671 Singapore

School of Biological Sciences, Nanyang Technological University, 637551 Singapore

Department of Biological Sciences, National University of Singapore, 117543 Singapore

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First published: 18 June 2016
Citations: 10

ABSTRACT

Most p53 mutations associated with cancer are located in its DNA binding domain (DBD). Many structures (X-ray and NMR) of this domain are available in the protein data bank (PDB) and a vast conformational heterogeneity characterizes the various free and complexed states. The major difference between the apo and the holo-complexed states appears to lie in the L1 loop. In particular, the conformations of this loop appear to depend intimately on the sequence of DNA to which it binds. This conclusion builds upon recent observations that implicate the tetramerization and the C-terminal domains (respectively TD and Cter) in DNA binding specificity. Detailed PCA analysis of the most recent collection of DBD structures from the PDB have been carried out. In contrast to recommendations that small molecules/drugs stabilize the flexible L1 loop to rescue mutant p53, our study highlights a need to retain the flexibility of the p53 DNA binding surface (DBS). It is the adaptability of this region that enables p53 to engage in the diverse interactions responsible for its functionality. Proteins 2016; 84:1443–1461. © 2016 Wiley Periodicals, Inc.

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