Sanges, Carmen (2009) Regulatory phosphorylations on the eukaryotic elongation factor 1A mediated by RAF kinases. [Tesi di dottorato] (Inedito)

[img]
Anteprima
PDF
sanges.pdf

Download (4MB) | Anteprima
Tipologia del documento: Tesi di dottorato
Lingua: English
Titolo: Regulatory phosphorylations on the eukaryotic elongation factor 1A mediated by RAF kinases
Autori:
AutoreEmail
Sanges, Carmensanges@dbbm.unina.it
Data: 30 Novembre 2009
Numero di pagine: 84
Istituzione: Università degli Studi di Napoli Federico II
Dipartimento: Biochimica e biotecnologie mediche
Scuola di dottorato: Scienze biologiche
Dottorato: Biochimica e biologia cellulare e molecolare
Ciclo di dottorato: 22
Coordinatore del Corso di dottorato:
nomeemail
D'Alessio, Giuseppe[non definito]
Tutor:
nomeemail
Arcari, Paoloarcari@dbbm.unina.it
Data: 30 Novembre 2009
Numero di pagine: 84
Parole chiave: eukaryotic elongation factor 1A
Settori scientifico-disciplinari del MIUR: Area 05 - Scienze biologiche > BIO/10 - Biochimica
Depositato il: 11 Mar 2010 12:11
Ultima modifica: 30 Apr 2014 19:37
URI: http://www.fedoa.unina.it/id/eprint/3649
DOI: 10.6092/UNINA/FEDOA/3649

Abstract

The elongation factor 1A has a crucial role in protein biosynthesis. EF1A belongs to the GTP-binding family of proteins and is able to deliver the aa-tRNA to the A-site of the ribosome because of its GTPase activity. Higher eukaryotes express two tissue specific isoforms of EF1A. In the last years, these isoforms were found to be involved in several different processes like senescence, apoptosis and transformation. In particular EF1A2 is overexpressed in several tumor cells and participates in drug resistence processes. Previous experiments in H1355 cells demonstrated that IFN treatment results in an antiapoptotical answer during which EF1A2 is increasingly expressed due to its RAF kinase mediated phosphorylation. As this interaction establishes a new link between the mitogenic cascade and protein biosynthesis, in vitro kinase assays were performed in presence of B- and C-RAF kinase and recombinant EF1A1/2 to investigate this important interaction. Mass spectrometry analysis identified treonine 88 (exclusively mediated by B-RAF) and serine 21 on EF1A1 and serine 21 on EF1A2 as B-/ and C-RAF mediated phosphorylation sites. Interestingly, serine 21 belongs to the consensus sequence of the GTP/GDP binding domain of EF1A. Its phosphorylation prevents the binding of the nucleotide suggesting that this potentially RAF mediated modification has a regulatory role affecting the function of the elongation factor.

Actions (login required)

Modifica documento Modifica documento