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==Crystal structure of Bos taurus Arp2/3 complex binding with C-terminus of Homo sapiens SPIN90==
==Crystal structure of Bos taurus Arp2/3 complex binding with C-terminus of Homo sapiens SPIN90==
<StructureSection load='6dec' size='340' side='right' caption='[[6dec]], [[Resolution|resolution]] 4.60&Aring;' scene=''>
<StructureSection load='6dec' size='340' side='right'caption='[[6dec]], [[Resolution|resolution]] 4.60&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[6dec]] is a 18 chain structure with sequence from [http://en.wikipedia.org/wiki/ ] and [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6DEC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6DEC FirstGlance]. <br>
<table><tr><td colspan='2'>[[6dec]] is a 18 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus] and [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6DEC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6DEC FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</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]] 4.6&#8491;</td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=UNK:UNKNOWN'>UNK</scene></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6dec FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6dec OCA], [http://pdbe.org/6dec PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6dec RCSB], [http://www.ebi.ac.uk/pdbsum/6dec PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6dec ProSAT]</span></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=6dec FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6dec OCA], [https://pdbe.org/6dec PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6dec RCSB], [https://www.ebi.ac.uk/pdbsum/6dec PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6dec ProSAT]</span></td></tr>
</table>
</table>
== Disease ==
[[http://www.uniprot.org/uniprot/SPN90_HUMAN SPN90_HUMAN]] A chromosomal aberration involving NCKIPSD/AF3p21 is found in therapy-related leukemia. Translocation t(3;11)(p21;q23) with KMT2A/MLL1.<ref>PMID:10648423</ref> 
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/ARPC4_BOVIN ARPC4_BOVIN]] Functions as actin-binding component of the Arp2/3 complex which is involved in regulation of actin polymerization and together with an activating nucleation-promoting factor (NPF) mediates the formation of branched actin networks. Seems to contact the mother actin filament (By similarity). [[http://www.uniprot.org/uniprot/ARC1B_BOVIN ARC1B_BOVIN]] Functions as component of the Arp2/3 complex which is involved in regulation of actin polymerization and together with an activating nucleation-promoting factor (NPF) mediates the formation of branched actin networks (By similarity). [[http://www.uniprot.org/uniprot/ARPC5_BOVIN ARPC5_BOVIN]] Functions as component of the Arp2/3 complex which is involved in regulation of actin polymerization and together with an activating nucleation-promoting factor (NPF) mediates the formation of branched actin networks (By similarity). [[http://www.uniprot.org/uniprot/ARP2_BOVIN ARP2_BOVIN]] Functions as ATP-binding component of the Arp2/3 complex which is involved in regulation of actin polymerization and together with an activating nucleation-promoting factor (NPF) mediates the formation of branched actin networks. Seems to contact the pointed end of the daughter actin filament. [[http://www.uniprot.org/uniprot/SPN90_HUMAN SPN90_HUMAN]] Has an important role in stress fiber formation induced by active diaphanous protein homolog 1 (DRF1). Induces microspike formation, in vivo (By similarity). In vitro, stimulates N-WASP-induced ARP2/3 complex activation in the absence of CDC42 (By similarity). May play an important role in the maintenance of sarcomeres and/or in the assembly of myofibrils into sarcomeres. Implicated in regulation of actin polymerization and cell adhesion. Plays a role in angiogenesis.<ref>PMID:22419821</ref>  [[http://www.uniprot.org/uniprot/ARP3_BOVIN ARP3_BOVIN]] Functions as ATP-binding component of the Arp2/3 complex which is involved in regulation of actin polymerization and together with an activating nucleation-promoting factor (NPF) mediates the formation of branched actin networks. Seems to contact the pointed end of the daughter actin filament. Plays a role in ciliogenesis (By similarity). [[http://www.uniprot.org/uniprot/ARPC2_BOVIN ARPC2_BOVIN]] Functions as actin-binding component of the Arp2/3 complex which is involved in regulation of actin polymerization and together with an activating nucleation-promoting factor (NPF) mediates the formation of branched actin networks. Seems to contact the mother actin filament (By similarity). [[http://www.uniprot.org/uniprot/ARPC3_BOVIN ARPC3_BOVIN]] Functions as component of the Arp2/3 complex which is involved in regulation of actin polymerization and together with an activating nucleation-promoting factor (NPF) mediates the formation of branched actin networks (By similarity).
[https://www.uniprot.org/uniprot/ARP3_BOVIN ARP3_BOVIN] Functions as ATP-binding component of the Arp2/3 complex which is involved in regulation of actin polymerization and together with an activating nucleation-promoting factor (NPF) mediates the formation of branched actin networks. Seems to contact the pointed end of the daughter actin filament. Plays a role in ciliogenesis (By similarity).
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Unlike the WASP family of Arp2/3 complex activators, WISH/DIP/SPIN90 (WDS) family proteins activate actin filament nucleation by the Arp2/3 complex without the need for a preformed actin filament. This allows WDS proteins to initiate branched actin network assembly by providing seed filaments that activate WASP-bound Arp2/3 complex. Despite their important role in actin network initiation, it is unclear how WDS proteins drive the activating steps that require both WASP and pre-existing actin filaments during WASP-mediated nucleation. Here, we show that SPIN90 folds into an armadillo repeat domain that binds a surface of Arp2/3 complex distinct from the two WASP sites, straddling a hinge point that may stimulate movement of the Arp2 subunit into the activated short-pitch conformation. SPIN90 binds a surface on Arp2/3 complex that overlaps with actin filament binding, explaining how it could stimulate the same structural rearrangements in the complex as pre-existing actin filaments. By revealing how WDS proteins activate the Arp2/3 complex, these data provide a molecular foundation to understand initiation of dendritic actin networks and regulation of Arp2/3 complex by its activators.
 
Structure of the nucleation-promoting factor SPIN90 bound to the actin filament nucleator Arp2/3 complex.,Luan Q, Liu SL, Helgeson LA, Nolen BJ EMBO J. 2018 Oct 15. pii: embj.2018100005. doi: 10.15252/embj.2018100005. PMID:30322896<ref>PMID:30322896</ref>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6dec" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
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</StructureSection>
</StructureSection>
[[Category: Bos taurus]]
[[Category: Bos taurus]]
[[Category: Luan, Q]]
[[Category: Homo sapiens]]
[[Category: Nolen, B J]]
[[Category: Large Structures]]
[[Category: Actin filament binding interface]]
[[Category: Luan Q]]
[[Category: Endocytosis]]
[[Category: Nolen BJ]]
[[Category: Linear filament nucleation activation]]
[[Category: Spin90 arp2-3 complex]]
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