Neuropilins lock secreted semaphorins onto plexins in a ternary signaling complex

Janssen, B. J.C., Malinauskas, T., Weir, G. A. , Cader, M. Z., Siebold, C. and E. Yvonne, J. (2012) Neuropilins lock secreted semaphorins onto plexins in a ternary signaling complex. Nature Structural and Molecular Biology, 19(12), pp. 1293-1299. (doi: 10.1038/nsmb.2416) (PMID:23104057) (PMCID:PMC3590443)

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Co-receptors add complexity to cell-cell signaling systems. The secreted semaphorin 3s (Sema3s) require a co-receptor, neuropilin (Nrp), to signal through plexin As (PlxnAs) in functions ranging from axon guidance to bone homeostasis, but the role of the co-receptor is obscure. Here we present the low-resolution crystal structure of a mouse semaphorin–plexin–Nrp complex alongside unliganded component structures. Dimeric semaphorin, two copies of plexin and two copies of Nrp are arranged as a dimer of heterotrimers. In each heterotrimer subcomplex, semaphorin contacts plexin, similar to in co-receptor–independent signaling complexes. The Nrp1s cross brace the assembly, bridging between sema domains of the Sema3A and PlxnA2 subunits from the two heterotrimers. Biophysical and cellular analyses confirm that this Nrp binding mode stabilizes a canonical, but weakened, Sema3–PlxnA interaction, adding co-receptor control over the mechanism by which receptor dimerization and/or oligomerization triggers signaling.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Weir, Dr Gregory
Authors: Janssen, B. J.C., Malinauskas, T., Weir, G. A., Cader, M. Z., Siebold, C., and E. Yvonne, J.
College/School:College of Medical Veterinary and Life Sciences > School of Psychology & Neuroscience
Journal Name:Nature Structural and Molecular Biology
Publisher:Nature Publishing Group
ISSN (Online):1545-9985
Published Online:28 October 2012

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