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© Ahmed Haouz
Cristaux d'une protéine de Mycobacterium tuberculosis produits dans le cadre du Grand Programme Horizontal sur la Tuberculose à l'Institut Pasteur. La caractérisation structurale de protéines mycobactériennes aide à une meilleure compréhension de la physiologie et de la pathogénicité des mycobactéries et fournit un point de départ pour la conception de nouveaux agents antibactériens.
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Structure (London, England : 1993) - 12 Oct 2011

Babault N, Cordier F, Lafage M, Cockburn J, Haouz A, Prehaud C, Rey FA, Delepierre M, Buc H, Lafon M, Wolff N

Link to Pubmed [PMID] – 22000519

Structure 2011 Oct;19(10):1518-24

PTPN4, a human tyrosine phosphatase, protects cells against apoptosis. This protection could be abrogated by targeting the PDZ domain of this phosphatase with a peptide mimicking the C-terminal sequence of the G protein of an attenuated rabies virus strain. Here, we demonstrate that glioblastoma death is triggered upon intracellular delivery of peptides, either from viral origin or from known endogenous ligands of PTPN4-PDZ, such as the C terminus sequence of the glutamate receptor subunit GluN2A. The killing efficiency of peptides closely reflects their affinities for the PTPN4-PDZ. The crystal structures of two PTPN4-PDZ/peptide complexes allow us to pinpoint the main structural determinants of binding and to synthesize a peptide of high affinity for PTPN4-PDZ enhancing markedly its cell death capacity. These results allow us to propose a potential mechanism for the efficiency of peptides and provide a target and a robust framework for the design of new pro-death compounds.