View source for 8ckm


==Semaphorin-5A TSR 3-4 domains==
<StructureSection load='8ckm' size='340' side='right'caption='[[8ckm]], [[Resolution|resolution]] 2.72&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8ckm]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8CKM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8CKM 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]] 2.72&#8491;</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=8ckm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8ckm OCA], [https://pdbe.org/8ckm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8ckm RCSB], [https://www.ebi.ac.uk/pdbsum/8ckm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8ckm ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/SEM5A_HUMAN SEM5A_HUMAN] Monosomy 5p. 
== Function ==
[https://www.uniprot.org/uniprot/SEM5A_HUMAN SEM5A_HUMAN] Bifunctional axonal guidance cue regulated by sulfated proteoglycans; attractive effects result from interactions with heparan sulfate proteoglycans (HSPGs), while the inhibitory effects depend on interactions with chondroitin sulfate proteoglycans (CSPGs) (By similarity). Ligand for receptor PLXNB3. In glioma cells, SEMA5A stimulation of PLXNB3 results in the disassembly of F-actin stress fibers, disruption of focal adhesions and cellular collapse as well as inhibition of cell migration and invasion through ARHGDIA-mediated inactivation of RAC1. May promote angiogenesis by increasing endothelial cell proliferation and migration and inhibiting apoptosis.<ref>PMID:15218527</ref> <ref>PMID:19850054</ref> <ref>PMID:20696765</ref> <ref>PMID:21706053</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Integration of extracellular signals by neurons is pivotal for brain development, plasticity, and repair. Axon guidance relies on receptor-ligand interactions crosstalking with extracellular matrix components. Semaphorin-5A (Sema5A) is a bifunctional guidance cue exerting attractive and inhibitory effects on neuronal growth through the interaction with heparan sulfate (HS) and chondroitin sulfate (CS) glycosaminoglycans (GAGs), respectively. Sema5A harbors seven thrombospondin type-1 repeats (TSR1-7) important for GAG binding, however the underlying molecular basis and functions in vivo remain enigmatic. Here we dissect the structural basis for Sema5A:GAG specificity and demonstrate the functional significance of this interaction in vivo. Using x-ray crystallography, we reveal a dimeric fold variation for TSR4 that accommodates GAG interactions. TSR4 co-crystal structures identify binding residues validated by site-directed mutagenesis. In vitro and cell-based assays uncover specific GAG epitopes necessary for TSR association. We demonstrate that HS-GAG binding is preferred over CS-GAG and mediates Sema5A oligomerization. In vivo, Sema5A:GAG interactions are necessary for Sema5A function and regulate Plexin-A2 dependent dentate progenitor cell migration. Our study rationalizes Sema5A associated developmental and neurological disorders and provides mechanistic insights into how multifaceted guidance functions of a single transmembrane cue are regulated by proteoglycans.

Structure and function of Semaphorin-5A glycosaminoglycan interactions.,Nagy GN, Zhao XF, Karlsson R, Wang K, Duman R, Harlos K, El Omari K, Wagner A, Clausen H, Miller RL, Giger RJ, Jones EY Nat Commun. 2024 Mar 28;15(1):2723. doi: 10.1038/s41467-024-46725-7. PMID:38548715<ref>PMID:38548715</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8ckm" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Duman R]]
[[Category: El Omari K]]
[[Category: Harlos K]]
[[Category: Jones EY]]
[[Category: Nagy GN]]
[[Category: Wagner A]]