SLMP53-1 interacts with wild-type and mutant p53 DNA-binding domain and reactivates multiple hotspot mutations

Ana Sara Gomes, Helena Ramos, Sara Gomes, Joana B. Loureiro, Joana Soares, Valentina Barcherini, Paola Monti, Gilberto Fronza, Carla Oliveira, Lucília Domingues, Margarida Bastos, Daniel F. A. R. Dourado, Ana Luísa Carvalho, Maria João Romão, Benedita Pinheiro, Filipa Marcelo, Alexandra Carvalho, Maria M. M. Santos, Lucília Saraiva

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Half of human cancers harbour TP53 mutations that render p53 inactive as a tumor suppressor. As such, reactivation of mutant (mut)p53 through restoration of wild-type (wt)-like function represents one of the most promising therapeutic strategies in cancer treatment. Recently, we have reported the (S)-tryptophanol-derived oxazoloisoindolinone SLMP53-1 as a new reactivator of wt and mutp53 R280K with in vitro and in vivo p53-dependent antitumor activity. The present work aimed a mechanistic elucidation of mutp53 reactivation by SLMP53-1.

Methods and results
By cellular thermal shift assay (CETSA), it is shown that SLMP53-1 induces wt and mutp53 R280K thermal stabilization, which is indicative of intermolecular interactions with these proteins. Accordingly, in silico studies of wt and mutp53 R280K DNA-binding domain with SLMP53-1 unveiled that the compound binds at the interface of the p53 homodimer with the DNA minor groove. Additionally, using yeast and p53-null tumor cells ectopically expressing distinct highly prevalent mutp53, the ability of SLMP53-1 to reactivate multiple mutp53 is evidenced.

SLMP53-1 is a p53-activating agent with the ability to directly target wt and a set of hotspot mutp53.

General Significance
This work reinforces the encouraging application of SLMP53-1 in the personalized treatment of cancer patients harboring distinct p53 status.
Original languageEnglish
Article number129440
Pages (from-to)129440
JournalBBA - General Subjects
Issue number1
Early online date16 Sept 2019
Publication statusPublished - Jan 2020


  • DBD
  • DNA-binding domain
  • mutp53
  • mutant p53
  • wt
  • wild-type
  • cellular thermal shift assay
  • SRB
  • sulforhodamine B
  • Reactivator
  • p53
  • Chemotherapy
  • Mutant
  • Cancer

ASJC Scopus subject areas

  • Molecular Biology
  • Biophysics
  • Biochemistry


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