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6uc4

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Revision as of 06:44, 11 April 2020

Barbed end side of a cofilactin cluster

6uc4, resolution 9.20Å

Structural highlights

6uc4 is a 16 chain structure with sequence from Human and Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	6uby, 6uc0
Gene:	CFL1, CFL (HUMAN)
Experimental data:	Check to display Experimental Data
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[ACTS_RABIT] Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells. [COF1_HUMAN] Binds to F-actin and exhibits pH-sensitive F-actin depolymerizing activity. Regulates actin cytoskeleton dynamics. Important for normal progress through mitosis and normal cytokinesis. Plays a role in the regulation of cell morphology and cytoskeletal organization.^[1] ^[2]

Publication Abstract from PubMed

Members of the cofilin/ADF family of proteins sever actin filaments, increasing the number of filament ends available for polymerization or depolymerization. Cofilin binds actin filaments with positive cooperativity, forming clusters of contiguously bound cofilin along the filament lattice. Filament severing occurs preferentially at boundaries between bare and cofilin-decorated (cofilactin) segments and is biased at 1 side of a cluster. A molecular understanding of cooperative binding and filament severing has been impeded by a lack of structural data describing boundaries. Here, we apply methods for analyzing filament cryo-electron microscopy (cryo-EM) data at the single subunit level to directly investigate the structure of boundaries within partially decorated cofilactin filaments. Subnanometer resolution maps of isolated, bound cofilin molecules and an actin-cofilactin boundary indicate that cofilin-induced actin conformational changes are local and limited to subunits directly contacting bound cofilin. An isolated, bound cofilin compromises longitudinal filament contacts of 1 protofilament, consistent with a single cofilin having filament-severing activity. An individual, bound phosphomimetic (S3D) cofilin with weak severing activity adopts a unique binding mode that does not perturb actin structure. Cofilin clusters disrupt both protofilaments, consistent with a higher severing activity at boundaries compared to single cofilin. Comparison of these structures indicates that this disruption is substantially greater at pointed end sides of cofilactin clusters than at the barbed end. These structures, with the distribution of bound cofilin clusters, suggest that maximum binding cooperativity is achieved when 2 cofilins occupy adjacent sites. These results reveal the structural origins of cooperative cofilin binding and actin filament severing.

Structures of cofilin-induced structural changes reveal local and asymmetric perturbations of actin filaments.,Huehn AR, Bibeau JP, Schramm AC, Cao W, De La Cruz EM, Sindelar CV Proc Natl Acad Sci U S A. 2020 Jan 21;117(3):1478-1484. doi:, 10.1073/pnas.1915987117. Epub 2020 Jan 3. PMID:31900364^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Gohla A, Birkenfeld J, Bokoch GM. Chronophin, a novel HAD-type serine protein phosphatase, regulates cofilin-dependent actin dynamics. Nat Cell Biol. 2005 Jan;7(1):21-9. Epub 2004 Dec 5. PMID:15580268 doi:10.1038/ncb1201
↑ Bai SW, Herrera-Abreu MT, Rohn JL, Racine V, Tajadura V, Suryavanshi N, Bechtel S, Wiemann S, Baum B, Ridley AJ. Identification and characterization of a set of conserved and new regulators of cytoskeletal organization, cell morphology and migration. BMC Biol. 2011 Aug 11;9:54. doi: 10.1186/1741-7007-9-54. PMID:21834987 doi:10.1186/1741-7007-9-54
↑ Huehn AR, Bibeau JP, Schramm AC, Cao W, De La Cruz EM, Sindelar CV. Structures of cofilin-induced structural changes reveal local and asymmetric perturbations of actin filaments. Proc Natl Acad Sci U S A. 2020 Jan 21;117(3):1478-1484. doi:, 10.1073/pnas.1915987117. Epub 2020 Jan 3. PMID:31900364 doi:http://dx.doi.org/10.1073/pnas.1915987117

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/6uc4"

@@ Line 3: / Line 3: @@
 <SX load='6uc4' size='340' side='right' viewer='molstar' caption='[[6uc4]], [[Resolution|resolution]] 9.20&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6uc4]] is a 16 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6UC4 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6UC4 FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6uc4]] is a 16 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human] and [http://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6UC4 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6UC4 FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
+</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADP:ADENOSINE-5-DIPHOSPHATE'>ADP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[6uby|6uby]], [[6uc0|6uc0]]</td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CFL1, CFL ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=6uc4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6uc4 OCA], [http://pdbe.org/6uc4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6uc4 RCSB], [http://www.ebi.ac.uk/pdbsum/6uc4 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6uc4 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=6uc4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6uc4 OCA], [http://pdbe.org/6uc4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6uc4 RCSB], [http://www.ebi.ac.uk/pdbsum/6uc4 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6uc4 ProSAT]</span></td></tr>
 </table>
 == Function ==

6uc4

From Proteopedia

Revision as of 06:44, 11 April 2020

Barbed end side of a cofilactin cluster

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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