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New page: left|200px<br /><applet load="2i1q" size="450" color="white" frame="true" align="right" spinBox="true" caption="2i1q, resolution 1.9Å" /> '''RadA Recombinase in c... |
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== | ==RadA Recombinase in complex with Calcium== | ||
Archaeal RadA or Rad51 recombinases are close homologues of eukaryal Rad51 | <StructureSection load='2i1q' size='340' side='right'caption='[[2i1q]], [[Resolution|resolution]] 1.90Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2i1q]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Methanococcus_voltae Methanococcus voltae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2I1Q OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2I1Q FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ANP:PHOSPHOAMINOPHOSPHONIC+ACID-ADENYLATE+ESTER'>ANP</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></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=2i1q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2i1q OCA], [https://pdbe.org/2i1q PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2i1q RCSB], [https://www.ebi.ac.uk/pdbsum/2i1q PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2i1q ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/RADA_METVO RADA_METVO] Involved in DNA repair and in homologous recombination. Binds and assemble on single-stranded DNA to form a nucleoprotein filament. Hydrolyzes ATP in a ssDNA-dependent manner and promotes DNA strand exchange between homologous DNA molecules (By similarity). | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/i1/2i1q_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2i1q ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Archaeal RadA or Rad51 recombinases are close homologues of eukaryal Rad51 and DMC1. These and bacterial RecA orthologues play a key role in DNA repair by forming helical nucleoprotein filaments in which a hallmark strand exchange reaction between homologous DNA substrates occurs. Recent studies have discovered the stimulatory role by calcium on human and yeast recombinases. Here we report that the strand exchange activity but not the ATPase activity of an archaeal RadA/Rad51 recombinase from Methanococcus voltae (MvRadA) is also subject to calcium stimulation. Crystallized MvRadA filaments in the presence of CaCl(2) resemble that of the recently reported ATPase active form in the presence of an activating dose of KCl. At the ATPase center, one Ca(2+) ion takes the place of two K(+) ions in the K(+)-bound form. The terminal phosphate of the nonhydrolyzable ATP analogue is in a staggered conformation in the Ca(2+)-bound form. In comparison, an eclipsed conformation was seen in the K(+)-bound form. Despite the changes in the ATPase center, both forms harbor largely ordered L2 regions in essentially identical conformations. These data suggest a unified stimulation mechanism by potassium and calcium because of the existence of a conserved ATPase center promiscuous in binding cations. | |||
Calcium stiffens archaeal Rad51 recombinase from Methanococcus voltae for homologous recombination.,Qian X, He Y, Ma X, Fodje MN, Grochulski P, Luo Y J Biol Chem. 2006 Dec 22;281(51):39380-7. Epub 2006 Oct 17. PMID:17050545<ref>PMID:17050545</ref> | |||
== | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | |||
<div class="pdbe-citations 2i1q" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Resolvase 3D structures|Resolvase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Methanococcus voltae]] | [[Category: Methanococcus voltae]] | ||
[[Category: Fodje MN]] | |||
[[Category: Fodje | [[Category: Grochulski P]] | ||
[[Category: Grochulski | [[Category: He Y]] | ||
[[Category: He | [[Category: Luo Y]] | ||
[[Category: Luo | [[Category: Ma X]] | ||
[[Category: Ma | [[Category: Qian X]] | ||
[[Category: Qian | |||
Latest revision as of 13:05, 30 August 2023
RadA Recombinase in complex with CalciumRadA Recombinase in complex with Calcium
Structural highlights
FunctionRADA_METVO Involved in DNA repair and in homologous recombination. Binds and assemble on single-stranded DNA to form a nucleoprotein filament. Hydrolyzes ATP in a ssDNA-dependent manner and promotes DNA strand exchange between homologous DNA molecules (By similarity). Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedArchaeal RadA or Rad51 recombinases are close homologues of eukaryal Rad51 and DMC1. These and bacterial RecA orthologues play a key role in DNA repair by forming helical nucleoprotein filaments in which a hallmark strand exchange reaction between homologous DNA substrates occurs. Recent studies have discovered the stimulatory role by calcium on human and yeast recombinases. Here we report that the strand exchange activity but not the ATPase activity of an archaeal RadA/Rad51 recombinase from Methanococcus voltae (MvRadA) is also subject to calcium stimulation. Crystallized MvRadA filaments in the presence of CaCl(2) resemble that of the recently reported ATPase active form in the presence of an activating dose of KCl. At the ATPase center, one Ca(2+) ion takes the place of two K(+) ions in the K(+)-bound form. The terminal phosphate of the nonhydrolyzable ATP analogue is in a staggered conformation in the Ca(2+)-bound form. In comparison, an eclipsed conformation was seen in the K(+)-bound form. Despite the changes in the ATPase center, both forms harbor largely ordered L2 regions in essentially identical conformations. These data suggest a unified stimulation mechanism by potassium and calcium because of the existence of a conserved ATPase center promiscuous in binding cations. Calcium stiffens archaeal Rad51 recombinase from Methanococcus voltae for homologous recombination.,Qian X, He Y, Ma X, Fodje MN, Grochulski P, Luo Y J Biol Chem. 2006 Dec 22;281(51):39380-7. Epub 2006 Oct 17. PMID:17050545[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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