The regulatory domain of the RIG-I family ATPase LGP2 senses double-stranded RNA.
The regulatory domain of the RIG-I family ATPase LGP2 senses double-stranded RNA.
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DOI:
10.1093/nar/gkp059
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发表时间:
2009-04
影响因子:
14.9
通讯作者:
Hopfner KP
中科院分区:
文献类型:
--
作者:
Pippig DA;Hellmuth JC;Cui S;Kirchhofer A;Lammens K;Lammens A;Schmidt A;Rothenfusser S;Hopfner KP
RIG-I and MDA5 sense cytoplasmic viral RNA and set-off a signal transduction cascade, leading to antiviral innate immune response. The third RIG-I-like receptor, LGP2, differentially regulates RIG-I- and MDA5-dependent RNA sensing in an unknown manner. All three receptors possess a C-terminal regulatory domain (RD), which in the case of RIG-I senses the viral pattern 5′-triphosphate RNA and activates ATP-dependent signaling by RIG-I. Here we report the 2.6 Å crystal structure of LGP2 RD along with in vitro and in vivo functional analyses and a homology model of MDA5 RD. Although LGP2 RD is structurally related to RIG-I RD, we find it rather binds double-stranded RNA (dsRNA) and this binding is independent of 5′-triphosphates. We identify conserved and receptor-specific parts of the RNA binding site. Latter are required for specific dsRNA binding by LGP2 RD and could confer pattern selectivity between RIG-I-like receptors. Our data furthermore suggest that LGP2 RD modulates RIG-I-dependent signaling via competition for dsRNA, another pattern sensed by RIG-I, while a fully functional LGP2 is required to augment MDA5-dependent signaling.
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DOI:
10.1107/s0907444904019158
发表时间:
2004-12-01
影响因子:
2.2
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通讯作者:
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