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| | <StructureSection load='5k6v' size='340' side='right'caption='[[5k6v]], [[Resolution|resolution]] 3.21Å' scene=''> | | <StructureSection load='5k6v' size='340' side='right'caption='[[5k6v]], [[Resolution|resolution]] 3.21Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5k6v]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5K6V OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=5K6V FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5k6v]] 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=5K6V OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5K6V FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.208Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5k6u|5k6u]], [[5k6w|5k6w]], [[5k6x|5k6x]], [[5k6y|5k6y]], [[5k6z|5k6z]], [[5k70|5k70]]</td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Sdk1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 LK3 transgenic mice])</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=5k6v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5k6v OCA], [https://pdbe.org/5k6v PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5k6v RCSB], [https://www.ebi.ac.uk/pdbsum/5k6v PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5k6v ProSAT]</span></td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=5k6v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5k6v OCA], [http://pdbe.org/5k6v PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5k6v RCSB], [http://www.ebi.ac.uk/pdbsum/5k6v PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5k6v ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/SDK1_MOUSE SDK1_MOUSE]] Adhesion molecule that promotes lamina-specific synaptic connections in the retina. Expressed in specific subsets of interneurons and retinal ganglion cells (RGCs) and promotes synaptic connectivity via homophilic interactions.[UniProtKB:Q8AV58] | + | [https://www.uniprot.org/uniprot/SDK1_MOUSE SDK1_MOUSE] Adhesion molecule that promotes lamina-specific synaptic connections in the retina. Expressed in specific subsets of interneurons and retinal ganglion cells (RGCs) and promotes synaptic connectivity via homophilic interactions.[UniProtKB:Q8AV58] |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Lk3 transgenic mice]] | + | [[Category: Mus musculus]] |
| - | [[Category: Goodman, K M]] | + | [[Category: Goodman KM]] |
| - | [[Category: Honig, B]] | + | [[Category: Honig B]] |
| - | [[Category: Jin, X]] | + | [[Category: Jin X]] |
| - | [[Category: Mannepalli, S]] | + | [[Category: Mannepalli S]] |
| - | [[Category: Shapiro, L]] | + | [[Category: Shapiro L]] |
| - | [[Category: Cell adhesion]]
| + | |
| - | [[Category: Immunoglobulin]]
| + | |
| Structural highlights
Function
SDK1_MOUSE Adhesion molecule that promotes lamina-specific synaptic connections in the retina. Expressed in specific subsets of interneurons and retinal ganglion cells (RGCs) and promotes synaptic connectivity via homophilic interactions.[UniProtKB:Q8AV58]
Publication Abstract from PubMed
Sidekick (Sdk) 1 and 2 are related immunoglobulin superfamily cell adhesion proteins required for appropriate synaptic connections between specific subtypes of retinal neurons. Sdks mediate cell-cell adhesion with homophilic specificity that underlies their neuronal targeting function. Here we report crystal structures of Sdk1 and Sdk2 ectodomain regions, revealing similar homodimers mediated by the four N-terminal immunoglobulin domains (Ig1-4), arranged in a horseshoe conformation. These Ig1-4 horseshoes interact in a novel back-to-back orientation in both homodimers through Ig1:Ig2, Ig1:Ig1 and Ig3:Ig4 interactions. Structure-guided mutagenesis results show that this canonical dimer is required for both Sdk-mediated cell aggregation (via trans interactions) and Sdk clustering in isolated cells (via cis interactions). Sdk1/Sdk2 recognition specificity is encoded across Ig1-4, with Ig1-2 conferring the majority of binding affinity and differential specificity. We suggest that competition between cis and trans interactions provides a novel mechanism to sharpen the specificity of cell-cell interactions.
Molecular basis of sidekick-mediated cell-cell adhesion and specificity.,Goodman KM, Yamagata M, Jin X, Mannepalli S, Katsamba PS, Ahlsen G, Sergeeva AP, Honig B, Sanes JR, Shapiro L Elife. 2016 Sep 19;5. pii: e19058. doi: 10.7554/eLife.19058. PMID:27644106[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Goodman KM, Yamagata M, Jin X, Mannepalli S, Katsamba PS, Ahlsen G, Sergeeva AP, Honig B, Sanes JR, Shapiro L. Molecular basis of sidekick-mediated cell-cell adhesion and specificity. Elife. 2016 Sep 19;5. pii: e19058. doi: 10.7554/eLife.19058. PMID:27644106 doi:http://dx.doi.org/10.7554/eLife.19058
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