View source for 5l7n


==Plexin A1 extracellular fragment, domains 7-10 (IPT3-IPT6)==
<StructureSection load='5l7n' size='340' side='right'caption='[[5l7n]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5l7n]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5L7N OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5L7N FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5l7n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5l7n OCA], [https://pdbe.org/5l7n PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5l7n RCSB], [https://www.ebi.ac.uk/pdbsum/5l7n PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5l7n ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PLXA1_MOUSE PLXA1_MOUSE] Coreceptor for SEMA3A, SEMA3C, SEMA3F and SEMA6D. Necessary for signaling by class 3 semaphorins and subsequent remodeling of the cytoskeleton. Plays a role in axon guidance, invasive growth and cell migration. Class 3 semaphorins bind to a complex composed of a neuropilin and a plexin. The plexin modulates the affinity of the complex for specific semaphorins, and its cytoplasmic domain is required for the activation of down-stream signaling events in the cytoplasm.<ref>PMID:10520994</ref> <ref>PMID:10781943</ref> 
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== Publication Abstract from PubMed ==
Class A plexins (PlxnAs) act as semaphorin receptors and control diverse aspects of nervous system development and plasticity, ranging from axon guidance and neuron migration to synaptic organization. PlxnA signaling requires cytoplasmic domain dimerization, but extracellular regulation and activation mechanisms remain unclear. Here we present crystal structures of PlxnA (PlxnA1, PlxnA2, and PlxnA4) full ectodomains. Domains 1-9 form a ring-like conformation from which the C-terminal domain 10 points away. All our PlxnA ectodomain structures show autoinhibitory, intermolecular "head-to-stalk" (domain 1 to domain 4-5) interactions, which are confirmed by biophysical assays, live cell fluorescence microscopy, and cell-based and neuronal growth cone collapse assays. This work reveals a 2-fold role of the PlxnA ectodomains: imposing a pre-signaling autoinhibitory separation for the cytoplasmic domains via intermolecular head-to-stalk interactions and supporting dimerization-based PlxnA activation upon ligand binding. More generally, our data identify a novel molecular mechanism for preventing premature activation of axon guidance receptors.

Structural Basis for Plexin Activation and Regulation.,Kong Y, Janssen BJ, Malinauskas T, Vangoor VR, Coles CH, Kaufmann R, Ni T, Gilbert RJ, Padilla-Parra S, Pasterkamp RJ, Jones EY Neuron. 2016 Jul 5. pii: S0896-6273(16)30295-1. doi:, 10.1016/j.neuron.2016.06.018. PMID:27397516<ref>PMID:27397516</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 5l7n" style="background-color:#fffaf0;"></div>

==See Also==
*[[Plexin 3D structures|Plexin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Coles CH]]
[[Category: Gilbert RJC]]
[[Category: Janssen BJC]]
[[Category: Jones EY]]
[[Category: Kaufmann R]]
[[Category: Kong Y]]
[[Category: Malinauskas T]]
[[Category: Ni T]]
[[Category: Padilla-Parra S]]
[[Category: Pasterkamp RJ]]
[[Category: Vangoor VR]]