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4dix

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==Crystal structure of the Ig-PH domain of actin-binding protein SCAB1==
==Crystal structure of the Ig-PH domain of actin-binding protein SCAB1==
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<StructureSection load='4dix' size='340' side='right' caption='[[4dix]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
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<StructureSection load='4dix' size='340' side='right'caption='[[4dix]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[4dix]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4DIX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4DIX FirstGlance]. <br>
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<table><tr><td colspan='2'>[[4dix]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Arabidopsis_thaliana Arabidopsis thaliana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4DIX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4DIX FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MLI:MALONATE+ION'>MLI</scene></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.7&#8491;</td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4djg|4djg]]</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MLI:MALONATE+ION'>MLI</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">At2g26770, AT2G26770 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3702 Arabidopsis thaliana])</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4dix FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4dix OCA], [https://pdbe.org/4dix PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4dix RCSB], [https://www.ebi.ac.uk/pdbsum/4dix PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4dix ProSAT]</span></td></tr>
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<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=4dix FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4dix OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4dix RCSB], [http://www.ebi.ac.uk/pdbsum/4dix PDBsum]</span></td></tr>
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</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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[https://www.uniprot.org/uniprot/SCAB1_ARATH SCAB1_ARATH] Plant-specific actin binding protein that bundles and stabilizes microfilaments (MFs). Has no nucleation or capping activity. Regulates MF reorganization during stomatal closure. The binding to F-actin is insensitive to Ca(2+) and pH. Binds weakly to inositol phosphates (PubMed:22356912).<ref>PMID:21719691</ref> <ref>PMID:22356912</ref>
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SCAB1 is a novel plant-specific actin-binding protein that binds, bundles, and stabilizes actin filaments and regulates stomatal movement. Here, we dissected the structure and function of SCAB1 by structural and biochemical approaches. We show that SCAB1 is composed of an actin-binding domain, two coiled-coil (CC) domains, and a fused immunoglobulin and pleckstrin homology (Ig-PH) domain. We determined crystal structures for the CC1 and Ig-PH domains at 1.9 and 1.7 A resolution, respectively. The CC1 domain adopts an antiparallel helical hairpin that further dimerizes into a four-helix bundle. The CC2 domain also mediates dimerization. At least one of the coiled coils is required for actin binding, indicating that SCAB1 is a bivalent actin cross-linker. The key residues required for actin binding were identified. The PH domain lacks a canonical basic phosphoinositide-binding pocket but can bind weakly to inositol phosphates via a basic surface patch, implying the involvement of inositol signaling in SCAB1 regulation. Our results provide novel insights into the functional organization of SCAB1.
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Plant actin-binding protein SCAB1 is dimeric actin cross-linker with atypical pleckstrin homology domain.,Zhang W, Zhao Y, Guo Y, Ye K J Biol Chem. 2012 Apr 6;287(15):11981-90. Epub 2012 Feb 22. PMID:22356912<ref>PMID:22356912</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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== References ==
== References ==
<references/>
<references/>
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</StructureSection>
</StructureSection>
[[Category: Arabidopsis thaliana]]
[[Category: Arabidopsis thaliana]]
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[[Category: Ye, K]]
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[[Category: Large Structures]]
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[[Category: Zhang, W]]
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[[Category: Ye K]]
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[[Category: Beta sheet]]
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[[Category: Zhang W]]
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[[Category: Cytosolic]]
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[[Category: Ig domain]]
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[[Category: Malonate ion]]
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[[Category: Ph domain]]
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[[Category: Ph superfold]]
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[[Category: Protein binding]]
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Current revision

Crystal structure of the Ig-PH domain of actin-binding protein SCAB1

PDB ID 4dix

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