Effects of the pentapeptide p33 on memory and synaptic plasticity in app/ps1 transgenic mice: a novel mechanism presenting the protein fe65 as a target

Titanilla Szögi, Ildikó Schuster, Emőke Borbély, Andrea Gyebrovszki, Zsolt Bozsó, János Gera, Róbert Rajkó, Miklós Sántha, Botond Penke, Lívia Fülöp

Research output: Contribution to journalArticle


Regulated intramembrane proteolysis (RIP) of the amyloid precursor protein (APP) leads to the formation of fragments, among which the intracellular domain of APP (AICD) was also identified to be a causative of early pathological events. AICD-counteracting proteins, such as Fe65, may serve as alternative therapeutic targets of Alzheimer’s disease (AD). The detection of elevated levels of Fe65 in the brains of both human patients and APP transgenic mice may further strengthen the hypothesis that influencing the interaction between Fe65 and APP may have a beneficial effect on the course of AD. Based on a PXP motif, proven to bind to the WW domain of Fe65, a new pentapeptide was designed and tested. The impedimental effect of P33 on the production of beta amyloid (Aff) (soluble fraction and aggregated plaques) and on the typical features of the AD pathology (decreased dendritic spine density, synaptic markers, elevated inflammatory reactions) was also demonstrated. Significant enhancements of both learning ability and memory function were observed in a Morris water maze paradigm. The results led us to formulate the theory that P33 acts by altering the conformation of Fe65 via binding to its WW domain, consequently hindering any interactions between Fe65 and key members involved in APP processing.

Original languageEnglish
Article number3050
JournalInternational journal of molecular sciences
Issue number12
Publication statusPublished - Jun 2 2019



  • Alzheimer’s disease
  • Amyloid beta peptide
  • Amyloid beta precursor protein
  • Fe65 protein
  • Proline-rich peptide
  • WW domain

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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