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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2017 ; 8
(ä): 16043
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English Wikipedia
Nucleolin directly mediates Epstein-Barr virus immune evasion through binding to
G-quadruplexes of EBNA1 mRNA
#MMPMID28685753
Lista MJ
; Martins RP
; Billant O
; Contesse MA
; Findakly S
; Pochard P
; Daskalogianni C
; Beauvineau C
; Guetta C
; Jamin C
; Teulade-Fichou MP
; Fåhraeus R
; Voisset C
; Blondel M
Nat Commun
2017[Jul]; 8
(ä): 16043
PMID28685753
show ga
The oncogenic Epstein-Barr virus (EBV) evades the immune system but has an
Achilles heel: its genome maintenance protein EBNA1, which is essential for viral
genome maintenance but highly antigenic. EBV has seemingly evolved a system in
which the mRNA sequence encoding the glycine-alanine repeats (GAr) of the EBNA1
protein limits its expression to the minimal level necessary for function while
minimizing immune recognition. Here, we identify nucleolin (NCL) as a host factor
required for this process via a direct interaction with G-quadruplexes formed in
GAr-encoding mRNA sequence. Overexpression of NCL enhances GAr-based inhibition
of EBNA1 protein expression, whereas its downregulation relieves the suppression
of both expression and antigen presentation. Moreover, the G-quadruplex ligand
PhenDC3 prevents NCL binding to EBNA1 mRNA and reverses GAr-mediated repression
of EBNA1 expression and antigen presentation. Hence the NCL-EBNA1 mRNA
interaction is a relevant therapeutic target to trigger an immune response
against EBV-carrying cancers.