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Structural and functional studies of human PNPase in mitochondrial RNA metabolism

Descrizione del progetto

Approfondire la conoscenza degli enzimi mitocondriali chiave

Il polinucleotide fosforilasi è un enzima evolutivamente conservato che svolge un ruolo di rilievo nella degradazione e nell’omeostasi dell’RNA. Prove recenti sull’omologo batterico mostrano che il polinucleotide fosforilasi può anche fungere da chaperon per le molecole di RNA regolatore. Lo scopo del progetto MitoPNP, finanziato dall’UE, è quello di studiare le funzioni e il ruolo biologico del polinucleotide fosforilasi umano. Dato che l’enzima si localizza nello spazio intermembrana dei mitocondri, i ricercatori ipotizzano che possa essere coinvolto nel trasporto dell’RNA mitocondriale. I risultati forniranno conoscenze fondamentali sulla biologia mitocondriale e aiuteranno a comprendere l’eziologia dei disturbi legati al polinucleotide fosforilasi.

Obiettivo

Throughout the eukaryotic lineages, mitochondria are essential organelles that provide cellular metabolic power through oxidative phosphorylation. In the mitochondrial intermembrane space resides an exoribonuclease highly conserved in the course of evolution: PNPase. Although the activity of this enzyme has been extensively studied, its function in this compartment is poorly understood. A clue to one of its potential functions has been provided by my recent findings on the bacterial PNPase, which I discovered to switch activity from an RNA degradation mode to a stabilising mode that chaperones regulatory RNAs. As the human and bacterial enzymes are homologues, it is possible that human PNPase (hPNPase) could have a dual mode of action as well, and could participate in regulatory processes or RNA cargo transport once trapped in a non-degradative assembly.
My research will address what functions are played by hPNPase present in the intermembrane space of the human mitochondria. I will characterise the full-length enzyme and its capacity to bind substrates in the degradative and non-degradative modes. In order to achieve these objectives, I will elucidate the structure-function relationship of hPNPase by cryo-electron microscopy complemented with biochemical and biophysical assays. The results will illuminate the biological roles of PNPase in human cells including its potential contributions to mitochondrial RNA trafficking. This interdisciplinary project with potential applications in human health will apply recent breakthrough advancements in cryo-EM in order to investigate the molecular basis of an intricate biological system to advance the understanding of mitochondria biology. The research effort will foster the career development of a talented researcher and contribute to the academic and research excellence in Poland by strengthening the expertise in cryo-EM, a method currently revolutionising structural biology, at the University of Warsaw.

Campo scientifico (EuroSciVoc)

CORDIS classifica i progetti con EuroSciVoc, una tassonomia multilingue dei campi scientifici, attraverso un processo semi-automatico basato su tecniche NLP.

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Invito a presentare proposte

H2020-WF-2018-2020

Vedi altri progetti per questo bando

Bando secondario

H2020-WF-03-2020

Coordinatore

UNIWERSYTET WARSZAWSKI
Contribution nette de l'UE
€ 149 625,60
Indirizzo
KRAKOWSKIE PRZEDMIESCIE 26/28
00-927 Warszawa
Polonia

Mostra sulla mappa

Regione
Makroregion województwo mazowieckie Warszawski stołeczny Miasto Warszawa
Tipo di attività
Higher or Secondary Education Establishments
Collegamenti
Costo totale
€ 149 625,60