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| | <StructureSection load='5k0p' size='340' side='right'caption='[[5k0p]], [[Resolution|resolution]] 1.94Å' scene=''> | | <StructureSection load='5k0p' size='340' side='right'caption='[[5k0p]], [[Resolution|resolution]] 1.94Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5k0p]] is a 10 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=5K0P OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5K0P FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5k0p]] is a 10 chain structure with sequence from [https://en.wikipedia.org/wiki/Pyrobaculum_calidifontis_JCM_11548 Pyrobaculum calidifontis JCM 11548]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5K0P OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5K0P FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PG4:TETRAETHYLENE+GLYCOL'>PG4</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</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]] 1.94Å</td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5jyx|5jyx]]</td></tr> | + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PG4:TETRAETHYLENE+GLYCOL'>PG4</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</scene>, <scene name='pdbligand=SCN:THIOCYANATE+ION'>SCN</scene></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'>[https://proteopedia.org/fgij/fg.htm?mol=5k0p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5k0p OCA], [https://pdbe.org/5k0p PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5k0p RCSB], [https://www.ebi.ac.uk/pdbsum/5k0p PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5k0p 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=5k0p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5k0p OCA], [http://pdbe.org/5k0p PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5k0p RCSB], [http://www.ebi.ac.uk/pdbsum/5k0p PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5k0p ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | + | == Function == |
| | + | [https://www.uniprot.org/uniprot/QUEFL_PYRCJ QUEFL_PYRCJ] Is responsible for the final step in the biosynthesis of archaeosine, a modified nucleoside present in the dihydrouridine loop (D-loop) of archaeal tRNA (PubMed:28383498, PubMed:22032275). Catalyzes the conversion of 7-cyano-7-deazaguanine (preQ0)-modified tRNA to archaeosine-tRNA, transforming a nitrile group to a formamidine group. Can use neither glutamine nor asparagine as amino donor in vitro, is only able to utilize free ammonium (PubMed:28383498). However, the enzyme might function in vivo with a partner that serves to generate ammonium.<ref>PMID:22032275</ref> <ref>PMID:28383498</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Pyrcj]] | + | [[Category: Pyrobaculum calidifontis JCM 11548]] |
| - | [[Category: Mei, X]] | + | [[Category: Mei X]] |
| - | [[Category: Swairjo, M A]] | + | [[Category: Swairjo MA]] |
| - | [[Category: Amidinotransferase]]
| + | |
| - | [[Category: P2 structure]]
| + | |
| - | [[Category: Transferase]]
| + | |
| - | [[Category: Tunneling-fold enzyme]]
| + | |
| Structural highlights
Function
QUEFL_PYRCJ Is responsible for the final step in the biosynthesis of archaeosine, a modified nucleoside present in the dihydrouridine loop (D-loop) of archaeal tRNA (PubMed:28383498, PubMed:22032275). Catalyzes the conversion of 7-cyano-7-deazaguanine (preQ0)-modified tRNA to archaeosine-tRNA, transforming a nitrile group to a formamidine group. Can use neither glutamine nor asparagine as amino donor in vitro, is only able to utilize free ammonium (PubMed:28383498). However, the enzyme might function in vivo with a partner that serves to generate ammonium.[1] [2]
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[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Phillips G, Swairjo MA, Gaston KW, Bailly M, Limbach PA, Iwata-Reuyl D, de Crécy-Lagard V. Diversity of archaeosine synthesis in crenarchaeota. ACS Chem Biol. 2012 Feb 17;7(2):300-5. PMID:22032275 doi:10.1021/cb200361w
- ↑ Bon Ramos A, Bao L, Turner B, de Crécy-Lagard V, Iwata-Reuyl D. QueF-Like, a Non-Homologous Archaeosine Synthase from the Crenarchaeota. Biomolecules. 2017 Apr 6;7(2):36. PMID:28383498 doi:10.3390/biom7020036
- ↑ Mei X, Alvarez J, Bon Ramos A, Samanta U, Iwata-Reuyl D, Swairjo MA. Crystal structure of the archaeosine synthase QueF-like-Insights into amidino transfer and tRNA recognition by the tunnel fold. Proteins. 2017 Jan;85(1):103-116. doi: 10.1002/prot.25202. Epub 2016 Nov 20. PMID:27802572 doi:http://dx.doi.org/10.1002/prot.25202
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