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| | ==Z. mobilis tRNA guanine transglycosylase E235Q mutant apo-structure at pH 5.5== | | ==Z. mobilis tRNA guanine transglycosylase E235Q mutant apo-structure at pH 5.5== |
| - | <StructureSection load='2oko' size='340' side='right' caption='[[2oko]], [[Resolution|resolution]] 1.50Å' scene=''> | + | <StructureSection load='2oko' size='340' side='right'caption='[[2oko]], [[Resolution|resolution]] 1.50Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2oko]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"achromobacter_anaerobium"_(sic)_shimwell_1937 "achromobacter anaerobium" (sic) shimwell 1937]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2OKO OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2OKO FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2oko]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/"achromobacter_anaerobium"_(sic)_shimwell_1937 "achromobacter anaerobium" (sic) shimwell 1937]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2OKO OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2OKO FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1y5x|1y5x]]</td></tr> | + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1y5x|1y5x]]</div></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">tgt ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=542 "Achromobacter anaerobium" (sic) Shimwell 1937])</td></tr> | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">tgt ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=542 "Achromobacter anaerobium" (sic) Shimwell 1937])</td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/tRNA-guanine(34)_transglycosylase tRNA-guanine(34) transglycosylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.29 2.4.2.29] </span></td></tr> | + | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/tRNA-guanine(34)_transglycosylase tRNA-guanine(34) transglycosylase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.29 2.4.2.29] </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=2oko FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2oko OCA], [http://pdbe.org/2oko PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2oko RCSB], [http://www.ebi.ac.uk/pdbsum/2oko PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2oko 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=2oko FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2oko OCA], [https://pdbe.org/2oko PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2oko RCSB], [https://www.ebi.ac.uk/pdbsum/2oko PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2oko ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/TGT_ZYMMO TGT_ZYMMO]] Exchanges the guanine residue with 7-aminomethyl-7-deazaguanine in tRNAs with GU(N) anticodons (tRNA-Asp, -Asn, -His and -Tyr). After this exchange, a cyclopentendiol moiety is attached to the 7-aminomethyl group of 7-deazaguanine, resulting in the hypermodified nucleoside queuosine (Q) (7-(((4,5-cis-dihydroxy-2-cyclopenten-1-yl)amino)methyl)-7-deazaguanosine).[HAMAP-Rule:MF_00168] | + | [[https://www.uniprot.org/uniprot/TGT_ZYMMO TGT_ZYMMO]] Exchanges the guanine residue with 7-aminomethyl-7-deazaguanine in tRNAs with GU(N) anticodons (tRNA-Asp, -Asn, -His and -Tyr). After this exchange, a cyclopentendiol moiety is attached to the 7-aminomethyl group of 7-deazaguanine, resulting in the hypermodified nucleoside queuosine (Q) (7-(((4,5-cis-dihydroxy-2-cyclopenten-1-yl)amino)methyl)-7-deazaguanosine).[HAMAP-Rule:MF_00168] |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
| | [[Image:Consurf_key_small.gif|200px|right]] | | [[Image:Consurf_key_small.gif|200px|right]] |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| | + | [[Category: Large Structures]] |
| | [[Category: Tidten, N]] | | [[Category: Tidten, N]] |
| | [[Category: E235q mutation]] | | [[Category: E235q mutation]] |
| Structural highlights
Function
[TGT_ZYMMO] Exchanges the guanine residue with 7-aminomethyl-7-deazaguanine in tRNAs with GU(N) anticodons (tRNA-Asp, -Asn, -His and -Tyr). After this exchange, a cyclopentendiol moiety is attached to the 7-aminomethyl group of 7-deazaguanine, resulting in the hypermodified nucleoside queuosine (Q) (7-(((4,5-cis-dihydroxy-2-cyclopenten-1-yl)amino)methyl)-7-deazaguanosine).[HAMAP-Rule:MF_00168]
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 PubMed
Bacterial tRNA-guanine transglycosylase (Tgt) catalyses the exchange of guanine in the wobble position of particular tRNAs by the modified base preQ(1). In vitro, however, the enzyme is also able to insert the immediate biosynthetic precursor, preQ(0), into those tRNAs. This substrate promiscuity is based on a peptide switch in the active site, gated by the general acid/base Glu235. The switch alters the properties of the binding pocket to allow either the accommodation of guanine or preQ(1). The peptide conformer recognising guanine, however, is also able to bind preQ(0). To investigate selectivity regulation, kinetic data for Zymomonas mobilis Tgt were recorded. They show that selectivity in favour of the actual substrate preQ(1) over preQ(0) is not achieved by a difference in affinity but via a higher turnover rate. Moreover, a Tgt(Glu235Gln) variant was constructed. The mutation was intended to stabilise the peptide switch in the conformation favouring guanine and preQ(0) binding. Kinetic characterisation of the mutated enzyme revealed that the Glu235Gln exchange has, with respect to all substrate bases, no significant influence on k(cat). In contrast, K(M)(preQ(1)) is drastically increased, while K(M)(preQ(0)) seems to be decreased. Hence, regarding k(cat)/K(M) as an indicator for catalytic efficiency, selectivity of Tgt in favour of preQ(1) is abolished or even inverted in favour of preQ(0) for Tgt(Glu235Gln). Crystal structures of the mutated enzyme confirm that the mutation strongly favours the binding pocket conformation required for the accommodation of guanine and preQ(0). The way this is achieved, however, significantly differs from that predicted based on crystal structures of wild-type Tgt.
Glutamate versus glutamine exchange swaps substrate selectivity in tRNA-guanine transglycosylase: insight into the regulation of substrate selectivity by kinetic and crystallographic studies.,Tidten N, Stengl B, Heine A, Garcia GA, Klebe G, Reuter K J Mol Biol. 2007 Nov 30;374(3):764-76. Epub 2007 Oct 22. PMID:17949745[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Tidten N, Stengl B, Heine A, Garcia GA, Klebe G, Reuter K. Glutamate versus glutamine exchange swaps substrate selectivity in tRNA-guanine transglycosylase: insight into the regulation of substrate selectivity by kinetic and crystallographic studies. J Mol Biol. 2007 Nov 30;374(3):764-76. Epub 2007 Oct 22. PMID:17949745 doi:10.1016/j.jmb.2007.09.062
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