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5jyx
From Proteopedia
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==Crystal structure of the covalent thioimide intermediate of the archaeosine synthase QueF-Like== | ==Crystal structure of the covalent thioimide intermediate of the archaeosine synthase QueF-Like== | ||
| - | <StructureSection load='5jyx' size='340' side='right' caption='[[5jyx]], [[Resolution|resolution]] 2.74Å' scene=''> | + | <StructureSection load='5jyx' size='340' side='right'caption='[[5jyx]], [[Resolution|resolution]] 2.74Å' scene=''> |
== Structural highlights == | == Structural highlights == | ||
| - | <table><tr><td colspan='2'>[[5jyx]] is a 15 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5JYX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5JYX FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5jyx]] is a 15 chain structure with sequence from [http://en.wikipedia.org/wiki/Pyrcj Pyrcj]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5JYX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5JYX FirstGlance]. <br> |
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GD1:2-AMINO-5-[(Z)-IMINOMETHYL]-3,7-DIHYDRO-4H-PYRROLO[2,3-D]PYRIMIDIN-4-ONE'>GD1</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr> | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GD1:2-AMINO-5-[(Z)-IMINOMETHYL]-3,7-DIHYDRO-4H-PYRROLO[2,3-D]PYRIMIDIN-4-ONE'>GD1</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr> | ||
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr> | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr> | ||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5k0p|5k0p]]</td></tr> | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5k0p|5k0p]]</td></tr> | ||
| + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Pcal_0221 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=410359 PYRCJ])</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=5jyx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5jyx OCA], [http://pdbe.org/5jyx PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5jyx RCSB], [http://www.ebi.ac.uk/pdbsum/5jyx PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5jyx 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=5jyx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5jyx OCA], [http://pdbe.org/5jyx PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5jyx RCSB], [http://www.ebi.ac.uk/pdbsum/5jyx PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5jyx ProSAT]</span></td></tr> | ||
</table> | </table> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | The tunneling-fold (T-fold) structural superfamily has emerged as a versatile protein scaffold of diverse catalytic activities. This is especially evident in the pathways to the 7-deazaguanosine modified nucleosides of tRNA queuosine and archaeosine. Four members of the T-fold superfamily have been confirmed in these pathways and here we report the crystal structure of a fifth enzyme; the recently discovered amidinotransferase QueF-Like (QueF-L), responsible for the final step in the biosynthesis of archaeosine in the D-loop of tRNA in a subset of Crenarchaeota. QueF-L catalyzes the conversion of the nitrile group of the 7-cyano-7-deazaguanine (preQ0 ) base of preQ0 -modified tRNA to a formamidino group. The structure, determined in the presence of preQ0 , reveals a symmetric T-fold homodecamer of two head-to-head facing pentameric subunits, with 10 active sites at the inter-monomer interfaces. Bound preQ0 forms a stable covalent thioimide bond with a conserved active site cysteine similar to the intermediate previously observed in the nitrile reductase QueF. Despite distinct catalytic functions, phylogenetic distributions, and only 19% sequence identity, the two enzymes share a common preQ0 binding pocket, and likely a common mechanism of thioimide formation. However, due to tight twisting of its decamer, QueF-L lacks the NADPH binding site present in QueF. A large positively charged molecular surface and a docking model suggest simultaneous binding of multiple tRNA molecules and structure-specific recognition of the D-loop by a surface groove. The structure sheds light on the mechanism of nitrile amidation, and the evolution of diverse chemistries in a common fold. Proteins 2016; 85:103-116. (c) 2016 Wiley Periodicals, Inc. | ||
| + | |||
| + | Crystal structure of the archaeosine synthase QueF-like-Insights into amidino transfer and tRNA recognition by the tunnel fold.,Mei X, Alvarez J, Bon Ramos A, Samanta U, Iwata-Reuyl D, Swairjo MA Proteins. 2017 Jan;85(1):103-116. doi: 10.1002/prot.25202. Epub 2016 Nov 20. PMID:27802572<ref>PMID:27802572</ref> | ||
| + | |||
| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
| + | <div class="pdbe-citations 5jyx" style="background-color:#fffaf0;"></div> | ||
| + | == References == | ||
| + | <references/> | ||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
| + | [[Category: Large Structures]] | ||
| + | [[Category: Pyrcj]] | ||
[[Category: Mei, X]] | [[Category: Mei, X]] | ||
[[Category: Swairjo, M A]] | [[Category: Swairjo, M A]] | ||
Revision as of 06:09, 10 July 2019
Crystal structure of the covalent thioimide intermediate of the archaeosine synthase QueF-Like
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