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TitleArchitecture of the Sema3A/PlexinA4/Neuropilin tripartite complex.
Journal, issue, pagesNat Commun, Vol. 12, Issue 1, Page 3172, Year 2021
Publish dateMay 26, 2021
AuthorsDefen Lu / Guijun Shang / Xiaojing He / Xiao-Chen Bai / Xuewu Zhang /
PubMed AbstractSecreted class 3 semaphorins (Sema3s) form tripartite complexes with the plexin receptor and neuropilin coreceptor, which are both transmembrane proteins that together mediate semaphorin signal for ...Secreted class 3 semaphorins (Sema3s) form tripartite complexes with the plexin receptor and neuropilin coreceptor, which are both transmembrane proteins that together mediate semaphorin signal for neuronal axon guidance and other processes. Despite extensive investigations, the overall architecture of and the molecular interactions in the Sema3/plexin/neuropilin complex are incompletely understood. Here we present the cryo-EM structure of a near intact extracellular region complex of Sema3A, PlexinA4 and Neuropilin 1 (Nrp1) at 3.7 Å resolution. The structure shows a large symmetric 2:2:2 assembly in which each subunit makes multiple interactions with others. The two PlexinA4 molecules in the complex do not interact directly, but their membrane proximal regions are close to each other and poised to promote the formation of the intracellular active dimer for signaling. The structure reveals a previously unknown interface between the a2b1b2 module in Nrp1 and the Sema domain of Sema3A. This interaction places the a2b1b2 module at the top of the complex, far away from the plasma membrane where the transmembrane regions of Nrp1 and PlexinA4 embed. As a result, the region following the a2b1b2 module in Nrp1 must span a large distance to allow the connection to the transmembrane region, suggesting an essential role for the long non-conserved linkers and the MAM domain in neuropilin in the semaphorin/plexin/neuropilin complex.
External linksNat Commun / PubMed:34039996 / PubMed Central
MethodsEM (single particle)
Resolution3.7 Å
Structure data

23613

7m0r

EMDB-23613, PDB-7m0r:
Cryo-EM structure of the Sema3A/PlexinA4/Neuropilin 1 complex
Method: EM (single particle) / Resolution: 3.7 Å

Chemicals

ChemComp-CA:
Unknown entry

Source
  • mus musculus (house mouse)
KeywordsSIGNALING PROTEIN / plexin / semaphorin / neuropilin / signaling

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