Structural organization of a full-length gp130/LIF-R cytokine receptor transmembrane complex.

Structural organization of a full-length gp130/LIF-R cytokine receptor transmembrane complex.
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DOI:
10.1016/j.molcel.2008.08.011
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发表时间:
2008-09-05
期刊:
影响因子:
16
通讯作者:
Garcia, K. Christopher
Garcia, K. Christopher
中科院分区:
生物学1区
文献类型:
--
作者:
Skiniotis, Georgios;Lupardus, Patrick J.;Martick, Monika;Walz, Thomas;Garcia, K. Christopher

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gp 130是至少九种细胞因子的共有受体,并且可以作为同源二聚体或作为与白血病抑制因子受体(LIF-R)的异源二聚体发出信号。在这里,我们的生物药理学和结构特征的全长,跨膜形式的四元细胞因子受体复合物组成的gp 130,LIF-R,细胞因子睫状神经营养因子(CNTF),及其α受体(CNTF-Rα)。热力学分析表明,与对称的gp 130/IL-6/IL-6 R α六聚体复合物的协同组装不同,CNTF/CNTF-Rα通过非协同的能量学作用使gp 130和IL-6 R α异源二聚化,形成1:1:1:1的不对称复合物。全长gp 130/LIF-R/CNTF-Rα/CNTF四元复合物的单粒子电子显微镜(EM)分析阐明了一种不对称的结构排列,其中受体细胞外和跨膜片段连接为一个连续的刚性单元,准备灵敏地抑制配体与近膜细胞内信号区的结合。这些研究还列举了gp 130家族细胞因子受体复合物(包括LIF、IL-27、IL-12等)的“高大”类组装的组织原则。
gp130 is a shared receptor for at least nine cytokines, and can signal either as a homodimer, or as a heterodimer with Leukemia Inhibitory Factor Receptor (LIF-R). Here we biophysically and structurally characterize the full-length, transmembrane form of a quaternary cytokine receptor complex consisting of gp130, LIF-R, the cytokine Ciliary Neurotrophic Factor (CNTF), and its alpha receptor (CNTF-Rα). Thermodynamic analysis indicates that, unlike the cooperative assembly of the symmetric gp130/Interleukin-6/IL-6Rα hexameric complex, CNTF/CNTF-Rα heterodimerizes gp130 and LIF-R via non-cooperative energetics to form an asymmetric 1:1:1:1 complex. Single particle electron microscopic (EM) analysis of the full-length gp130/LIF-R/CNTF-Rα/CNTF quaternary complex elucidates an asymmetric structural arrangement, in which the receptor extracellular and transmembrane segments join as a continuous, rigid unit, poised to sensitively transduce ligand engagement to the membrane-proximal intracellular signaling regions. These studies also enumerate the organizing principles for assembly of the ‘tall’ class of gp130-family cytokine receptor complexes including LIF, IL-27, IL-12, and others.
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