An unusual dimeric structure and assembly for TLR4 regulator RP105-MD-1.

An unusual dimeric structure and assembly for TLR4 regulator RP105-MD-1.
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DOI:
10.1038/nsmb.2106
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发表时间:
2011-08-21
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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RP105-MD-1调节TLR4-MD-2介导的针对细菌脂多糖(LPS)的先天免疫反应。牛1:1 RP105-MD-1复合体在2.9ä分辨率下与假定的内源性脂质结合,其晶体结构与其同系物TLR4-MD-2相似,但组装成不寻常的2:2同源二聚体,不同于任何其他已知的TLR配体组件。同源二聚体以头对头的方向组装,将两个RP105链的N-末端富含亮氨酸重复序列(LRR)并列在一起,而不是配体激活的TLR二聚体(如TLR1-2、3和4)中C-末端LRR的通常尾到尾结构。另一种新的相互作用是由RP105特异的ASN连接的葡聚糖介导的,它将MD-1嵌入RP105上的共受体结合凹陷中。RP105-MD-1中这种独特的组装模式代表了TLR复合体的新范式,并暗示了一种潜在的调节内毒素反应的分子机制。
RP105–MD-1 modulates the TLR4–MD-2-mediated, innate immune response against bacterial lipopolysaccharide (LPS). The crystal structure of the bovine 1:1 RP105–MD-1 complex bound to a putative endogenous lipid at 2.9 Å resolution shares a similar overall architecture to its homologue TLR4–MD-2, but assembles into an unusual 2:2 homodimer which differs from any other known TLR-ligand assembly. The homodimer is assembled in a head-to-head orientation that juxtaposes the N-terminal leucine-rich repeats (LRRs) of the two RP105 chains, rather than the usual tail-to-tail configuration of C-terminal LRRs in ligand-activated TLR dimers, such as TLR1–2, 3 and 4. Another novel interaction is mediated by an RP105-specific Asn-linked glycan, which wedges MD-1 into the co-receptor binding concavity on RP105. This unique mode of assembly in RP105–MD-1 represents a new paradigm for TLR complexes and suggests a potential molecular mechanism for regulating LPS responses.
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