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| | <StructureSection load='6i4m' size='340' side='right'caption='[[6i4m]], [[Resolution|resolution]] 1.87Å' scene=''> | | <StructureSection load='6i4m' size='340' side='right'caption='[[6i4m]], [[Resolution|resolution]] 1.87Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[6i4m]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6I4M OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6I4M FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[6i4m]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus] and [https://en.wikipedia.org/wiki/Plasmodium_berghei_ANKA Plasmodium berghei ANKA]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6I4M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6I4M 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=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SCN:THIOCYANATE+ION'>SCN</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]] 1.873Å</td></tr> |
| - | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=HIC:4-METHYL-HISTIDINE'>HIC</scene></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=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=HIC:4-METHYL-HISTIDINE'>HIC</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SCN:THIOCYANATE+ION'>SCN</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[6i4d|6i4d]], [[6i4e|6i4e]], [[6i4f|6i4f]], [[6i4g|6i4g]], [[6i4h|6i4h]], [[6i4i|6i4i]], [[6i4j|6i4j]], [[6i4k|6i4k]], [[6i4l|6i4l]]</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=6i4m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6i4m OCA], [https://pdbe.org/6i4m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6i4m RCSB], [https://www.ebi.ac.uk/pdbsum/6i4m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6i4m 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=6i4m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6i4m OCA], [http://pdbe.org/6i4m PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6i4m RCSB], [http://www.ebi.ac.uk/pdbsum/6i4m PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6i4m ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/ACT2_PLABA ACT2_PLABA]] 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/GELS_MOUSE GELS_MOUSE]] Calcium-regulated, actin-modulating protein that binds to the plus (or barbed) ends of actin monomers or filaments, preventing monomer exchange (end-blocking or capping). It can promote the assembly of monomers into filaments (nucleation) as well as sever filaments already formed. Plays a role in ciliogenesis. | + | [https://www.uniprot.org/uniprot/ACT2_PLABA ACT2_PLABA] Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells. |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </div> | | </div> |
| | <div class="pdbe-citations 6i4m" style="background-color:#fffaf0;"></div> | | <div class="pdbe-citations 6i4m" style="background-color:#fffaf0;"></div> |
| | + | |
| | + | ==See Also== |
| | + | *[[Actin 3D structures|Actin 3D structures]] |
| | + | *[[Gelsolin 3D structures|Gelsolin 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Han, H]] | + | [[Category: Mus musculus]] |
| - | [[Category: Kumpula, E P]] | + | [[Category: Plasmodium berghei ANKA]] |
| - | [[Category: Kursula, I]] | + | [[Category: Han H]] |
| - | [[Category: Lopez, A J]] | + | [[Category: Kumpula E-P]] |
| - | [[Category: Tajedin, L]] | + | [[Category: Kursula I]] |
| - | [[Category: Contractile protein]] | + | [[Category: Lopez AJ]] |
| - | [[Category: Cytoskeleton]] | + | [[Category: Tajedin L]] |
| - | [[Category: Filamentous]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| Structural highlights
6i4m is a 2 chain structure with sequence from Mus musculus and Plasmodium berghei ANKA. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Method: | X-ray diffraction, Resolution 1.873Å |
| Ligands: | , , , , |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
ACT2_PLABA Actins are highly conserved proteins that are involved in various types of cell motility and are ubiquitously expressed in all eukaryotic cells.
Publication Abstract from PubMed
Plasmodium actins form very short filaments and have a noncanonical link between ATP hydrolysis and polymerization. Long filaments are detrimental to the parasites, but the structural factors constraining Plasmodium microfilament lengths have remained unknown. Using high-resolution crystallography, we show that magnesium binding causes a slight flattening of the Plasmodium actin I monomer, and subsequent phosphate release results in a more twisted conformation. Thus, the Mg-bound monomer is closer in conformation to filamentous (F) actin than the Ca form, and this likely facilitates polymerization. A coordinated potassium ion resides in the active site during hydrolysis and leaves together with the phosphate, a process governed by the position of the Arg178/Asp180-containing A loop. Asp180 interacts with either Lys270 or His74, depending on the protonation state of the histidine, while Arg178 links the inner and outer domains (ID and OD) of the actin protomer. Hence, the A loop acts as a switch between stable and unstable filament conformations, the latter leading to fragmentation. Our data provide a comprehensive model for polymerization, ATP hydrolysis and phosphate release, and fragmentation of parasite microfilaments. Similar mechanisms may well exist in canonical actins, although fragmentation is much less favorable due to several subtle sequence differences as well as the methylation of His73, which is absent on the corresponding His74 in Plasmodium actin I.
Atomic view into Plasmodium actin polymerization, ATP hydrolysis, and fragmentation.,Kumpula EP, Lopez AJ, Tajedin L, Han H, Kursula I PLoS Biol. 2019 Jun 14;17(6):e3000315. doi: 10.1371/journal.pbio.3000315. PMID:31199804[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Kumpula EP, Lopez AJ, Tajedin L, Han H, Kursula I. Atomic view into Plasmodium actin polymerization, ATP hydrolysis, and fragmentation. PLoS Biol. 2019 Jun 14;17(6):e3000315. doi: 10.1371/journal.pbio.3000315. PMID:31199804 doi:http://dx.doi.org/10.1371/journal.pbio.3000315
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