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==Crystal structure of the coiled-coil 1 domain of actin-binding protein SCAB1==
==Crystal structure of the coiled-coil 1 domain of actin-binding protein SCAB1==
<StructureSection load='4djg' size='340' side='right' caption='[[4djg]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
<StructureSection load='4djg' size='340' side='right'caption='[[4djg]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[4djg]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Arath Arath]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4DJG OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4DJG FirstGlance]. <br>
<table><tr><td colspan='2'>[[4djg]] 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=4DJG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4DJG FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4dix|4dix]]</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]] 1.9&#8491;</td></tr>
<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 ARATH])</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=4djg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4djg OCA], [https://pdbe.org/4djg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4djg RCSB], [https://www.ebi.ac.uk/pdbsum/4djg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4djg ProSAT]</span></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=4djg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4djg OCA], [http://pdbe.org/4djg PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4djg RCSB], [http://www.ebi.ac.uk/pdbsum/4djg PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4djg ProSAT]</span></td></tr>
</table>
</table>
<div style="background-color:#fffaf0;">
== Function ==
== Publication Abstract from PubMed ==
[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>  
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.
 
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>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4djg" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Arath]]
[[Category: Arabidopsis thaliana]]
[[Category: Ye, K]]
[[Category: Large Structures]]
[[Category: Zhang, W]]
[[Category: Ye K]]
[[Category: Coiled-coil]]
[[Category: Zhang W]]
[[Category: Cytosolic]]
[[Category: Dimerization]]
[[Category: Four helix bundle]]
[[Category: Protein binding]]

Latest revision as of 11:48, 20 March 2024

Crystal structure of the coiled-coil 1 domain of actin-binding protein SCAB1Crystal structure of the coiled-coil 1 domain of actin-binding protein SCAB1

Structural highlights

4djg is a 2 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.9Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

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).[1] [2]

References

  1. ↑ Zhao Y, Zhao S, Mao T, Qu X, Cao W, Zhang L, Zhang W, He L, Li S, Ren S, Zhao J, Zhu G, Huang S, Ye K, Yuan M, Guo Y. The plant-specific actin binding protein SCAB1 stabilizes actin filaments and regulates stomatal movement in Arabidopsis. Plant Cell. 2011 Jun;23(6):2314-30. doi: 10.1105/tpc.111.086546. Epub 2011 Jun, 30. PMID:21719691 doi:http://dx.doi.org/10.1105/tpc.111.086546
  2. ↑ Zhang W, Zhao Y, Guo Y, Ye K. Plant actin-binding protein SCAB1 is dimeric actin cross-linker with atypical pleckstrin homology domain. J Biol Chem. 2012 Apr 6;287(15):11981-90. Epub 2012 Feb 22. PMID:22356912 doi:10.1074/jbc.M111.338525

4djg, resolution 1.90Å

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