National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM130289
米国
Cancer Prevention and Research Institute of Texas (CPRIT)
RP170644
米国
Cancer Prevention and Research Institute of Texas (CPRIT)
RP160082
米国
Welch Foundation
I-1944
米国
Welch Foundation
I-1702
米国
引用
ジャーナル: Nat Commun / 年: 2020 タイトル: Cryo-EM structure of the PlexinC1/A39R complex reveals inter-domain interactions critical for ligand-induced activation. 著者: Yi-Chun Kuo / Hua Chen / Guijun Shang / Emiko Uchikawa / Hui Tian / Xiao-Chen Bai / Xuewu Zhang / 要旨: Plexins are receptors for semaphorins that transduce signals for regulating neuronal development and other processes. Plexins are single-pass transmembrane proteins with multiple domains in both the ...Plexins are receptors for semaphorins that transduce signals for regulating neuronal development and other processes. Plexins are single-pass transmembrane proteins with multiple domains in both the extracellular and intracellular regions. Semaphorin activates plexin by binding to its extracellular N-terminal Sema domain, inducing the active dimer of the plexin intracellular region. The mechanism underlying this activation process of plexin is incompletely understood. We present cryo-electron microscopic structure of full-length human PlexinC1 in complex with the viral semaphorin mimic A39R. The structure shows that A39R induces a specific dimer of PlexinC1 where the membrane-proximal domains from the two PlexinC1 protomers are placed close to each other, poised to promote the active dimer of the intracellular region. This configuration is imposed by a distinct conformation of the PlexinC1 extracellular region, stabilized by inter-domain interactions among the Sema and membrane-proximal domains. Our mutational analyses support the critical role of this conformation in PlexinC1 activation.