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2017 ; 45
(3
): 1442-1454
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gab.com Text
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Selective RNA targeting and regulated signaling by RIG-I is controlled by
coordination of RNA and ATP binding
#MMPMID28180316
Fitzgerald ME
; Rawling DC
; Potapova O
; Ren X
; Kohlway A
; Pyle AM
Nucleic Acids Res
2017[Feb]; 45
(3
): 1442-1454
PMID28180316
show ga
RIG-I is an innate immune receptor that detects and responds to infection by
deadly RNA viruses such as influenza, and Hepatitis C. In the cytoplasm, RIG-I is
faced with a difficult challenge: it must sensitively detect viral RNA while
ignoring the abundance of host RNA. It has been suggested that RIG-I has a
?proof-reading? mechanism for rejecting host RNA targets, and that disruptions of
this selectivity filter give rise to autoimmune diseases. Here, we directly
monitor RNA proof-reading by RIG-I and we show that it is controlled by a set of
conserved amino acids that couple RNA and ATP binding to the protein (Motif III).
Mutations of this motif directly modulate proof-reading by eliminating or
enhancing selectivity for viral RNA, with major implications for autoimmune
disease and cancer. More broadly, the results provide a physical explanation for
the ATP-gated behavior of SF2 RNA helicases and receptor proteins.