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| | ==Structure of the Phactr1 RPEL domain and RPEL motif directed assemblies with G-actin reveal the molecular basis for actin binding cooperativity.== | | ==Structure of the Phactr1 RPEL domain and RPEL motif directed assemblies with G-actin reveal the molecular basis for actin binding cooperativity.== |
| - | <StructureSection load='4b1u' size='340' side='right' caption='[[4b1u]], [[Resolution|resolution]] 2.00Å' scene=''> | + | <StructureSection load='4b1u' size='340' side='right'caption='[[4b1u]], [[Resolution|resolution]] 2.00Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4b1u]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4B1U OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4B1U FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4b1u]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Oryctolagus_cuniculus Oryctolagus cuniculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4B1U OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4B1U 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>, <scene name='pdbligand=LAB:LATRUNCULIN+B'>LAB</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</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]] 2Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4b1v|4b1v]], [[4b1w|4b1w]], [[4b1x|4b1x]], [[4b1y|4b1y]], [[4b1z|4b1z]]</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>, <scene name='pdbligand=LAB:LATRUNCULIN+B'>LAB</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</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=4b1u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4b1u OCA], [http://pdbe.org/4b1u PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4b1u RCSB], [http://www.ebi.ac.uk/pdbsum/4b1u PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4b1u 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=4b1u FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4b1u OCA], [https://pdbe.org/4b1u PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4b1u RCSB], [https://www.ebi.ac.uk/pdbsum/4b1u PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4b1u ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/ACTS_MOUSE ACTS_MOUSE]] Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells. [[http://www.uniprot.org/uniprot/PHAR1_MOUSE PHAR1_MOUSE]] Binds actin monomers (G actin) and plays a role in the reorganization of the actin cytoskeleton and in formation of actin stress fibers. Plays a role in the formation of tubules by endothelial cells. Regulates PPP1CA activity. Required for normal cell survival (By similarity). Plays a role in cell motility.<ref>PMID:22976292</ref> <ref>PMID:23041370</ref> | + | [https://www.uniprot.org/uniprot/PHAR1_MOUSE PHAR1_MOUSE] Binds actin monomers (G actin) and plays a role in the reorganization of the actin cytoskeleton and in formation of actin stress fibers. Plays a role in the formation of tubules by endothelial cells. Regulates PPP1CA activity. Required for normal cell survival (By similarity). Plays a role in cell motility.<ref>PMID:22976292</ref> <ref>PMID:23041370</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | ==See Also== | | ==See Also== |
| - | *[[Actin|Actin]] | + | *[[Actin 3D structures|Actin 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| | + | [[Category: Large Structures]] |
| | [[Category: Oryctolagus cuniculus]] | | [[Category: Oryctolagus cuniculus]] |
| - | [[Category: McDonald, N Q]] | + | [[Category: McDonald NQ]] |
| - | [[Category: Mouilleron, S]] | + | [[Category: Mouilleron S]] |
| - | [[Category: Reilly, N O]] | + | [[Category: O'Reilly N]] |
| - | [[Category: Treisman, R]] | + | [[Category: Treisman R]] |
| - | [[Category: Wiezlak, M]] | + | [[Category: Wiezlak M]] |
| - | [[Category: Atp-binding]]
| + | |
| - | [[Category: Cytoskeleton]]
| + | |
| - | [[Category: Muscle protein]]
| + | |
| - | [[Category: Nucleotide-binding]]
| + | |
| - | [[Category: Structural protein]]
| + | |
| - | [[Category: Transcription regulation]]
| + | |
| Structural highlights
4b1u is a 2 chain structure with sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Method: | X-ray diffraction, Resolution 2Å |
| Ligands: | , , , , |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
PHAR1_MOUSE Binds actin monomers (G actin) and plays a role in the reorganization of the actin cytoskeleton and in formation of actin stress fibers. Plays a role in the formation of tubules by endothelial cells. Regulates PPP1CA activity. Required for normal cell survival (By similarity). Plays a role in cell motility.[1] [2]
Publication Abstract from PubMed
The Phactr family of PP1-binding proteins and the myocardin-related transcription factor family of transcriptional coactivators contain regulatory domains comprising three copies of the RPEL motif, a G-actin binding element. We report the structure of a Phactr1 G-actinRPEL domain complex. Three G-actins surround the crank-shaped RPEL domain forming a closed helical assembly. Their spatial relationship is identical to the RPEL-actins within the pentavalent MRTF G-actinRPEL domain complex, suggesting that conserved cooperative interactions between actinRPEL units organize the assembly. In the trivalent Phactr1 complex, each G-actinRPEL unit makes secondary contacts with its downstream actin involving distinct RPEL residues. Similar secondary contacts are seen in G-actinRPEL peptide crystals. Loss-of-secondary-contact mutations destabilize the Phactr1 G-actinRPEL assembly. Furthermore, actin-mediated inhibition of Phactr1 nuclear import requires secondary contact residues in the Phactr1 N-terminal RPEL-N motif, suggesting that it involves interaction of RPEL-N with the C-terminal assembly. Secondary actin contacts by actin-bound RPEL motifs thus govern formation of multivalent actinRPEL assemblies.
Structures of the Phactr1 RPEL Domain and RPEL Motif Complexes with G-Actin Reveal the Molecular Basis for Actin Binding Cooperativity.,Mouilleron S, Wiezlak M, O'Reilly N, Treisman R, McDonald NQ Structure. 2012 Oct 2. pii: S0969-2126(12)00335-8. doi:, 10.1016/j.str.2012.08.031. PMID:23041370[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Wiezlak M, Diring J, Abella J, Mouilleron S, Way M, McDonald NQ, Treisman R. G-actin regulates the shuttling and PP1 binding of the RPEL protein Phactr1 to control actomyosin assembly. J Cell Sci. 2012 Dec 1;125(Pt 23):5860-72. doi: 10.1242/jcs.112078. Epub 2012 Sep, 12. PMID:22976292 doi:10.1242/jcs.112078
- ↑ Mouilleron S, Wiezlak M, O'Reilly N, Treisman R, McDonald NQ. Structures of the Phactr1 RPEL Domain and RPEL Motif Complexes with G-Actin Reveal the Molecular Basis for Actin Binding Cooperativity. Structure. 2012 Oct 2. pii: S0969-2126(12)00335-8. doi:, 10.1016/j.str.2012.08.031. PMID:23041370 doi:10.1016/j.str.2012.08.031
- ↑ Mouilleron S, Wiezlak M, O'Reilly N, Treisman R, McDonald NQ. Structures of the Phactr1 RPEL Domain and RPEL Motif Complexes with G-Actin Reveal the Molecular Basis for Actin Binding Cooperativity. Structure. 2012 Oct 2. pii: S0969-2126(12)00335-8. doi:, 10.1016/j.str.2012.08.031. PMID:23041370 doi:10.1016/j.str.2012.08.031
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