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1p0b

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Revision as of 07:27, 15 February 2018

Crystal Structure Of tRNA-Guanine Transglycosylase (TGT) From Zymomonas mobilis Complexed With Archaeosine Precursor, Preq0

Structural highlights

1p0b is a 1 chain structure with sequence from "achromobacter_anaerobium"_(sic)_shimwell_1937 "achromobacter anaerobium" (sic) shimwell 1937. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Related:	1pud, 1it8, 1n2v
Gene:	TGT ("Achromobacter anaerobium" (sic) Shimwell 1937)
Activity:	tRNA-guanine(34) transglycosylase, with EC number 2.4.2.29
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

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

The enzyme tRNA-guanine transglycosylase (TGT, EC 2.4.2.29) catalyses a base-exchange reaction that leads to anticodon modifications of certain tRNAs. The TGT enzymes of the eubacteria Zymomonas mobilis (Z. mobilis TGT) and Escherichia coli (E. coli TGT) show a different behaviour in the presence of competitive inhibitors. The active sites of both enzymes are identical apart from a single conservative amino acid exchange, namely Tyr106 of Z. mobilis TGT is replaced by a Phe in E. coli TGT. Although Tyr106 is, in contrast to Phe106, hydrogen bonded in the ligand-free structure, we can show by a mutational study of TGT(Y106F) that this is not the reason for the different responses upon competition. The TGT enzymes of various species differ in their substrate selectivity. Depending on the applied pH conditions and/or induced by ligand binding, a peptide-bond flip modulates the recognition properties of the substrate binding site, which changes between donor and acceptor functionality. Furthermore interstitial water molecules play an important role in these adaptations of the pocket. The flip of the peptide bond is further stabilised by a glutamate residue that operates as general acid/base. An active-site aspartate residue, presumed to operate as a nucleophile through covalent bonding during the base-exchange reaction, shows different conformations depending on the nature of the bound ligand. The induced-fit adaptations observed in the various TGT complex structures by multiple crystal-structure analyses are in agreement with the functional properties of the enzyme. In consequence, full understanding of this plasticity can be exploited for drug design.

Flexible adaptations in the structure of the tRNA-modifying enzyme tRNA-guanine transglycosylase and their implications for substrate selectivity, reaction mechanism and structure-based drug design.,Brenk R, Stubbs MT, Heine A, Reuter K, Klebe G Chembiochem. 2003 Oct 6;4(10):1066-77. PMID:14523925^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Brenk R, Stubbs MT, Heine A, Reuter K, Klebe G. Flexible adaptations in the structure of the tRNA-modifying enzyme tRNA-guanine transglycosylase and their implications for substrate selectivity, reaction mechanism and structure-based drug design. Chembiochem. 2003 Oct 6;4(10):1066-77. PMID:14523925 doi:10.1002/cbic.200300644

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1p0b"

@@ Line 1: / Line 1: @@
 ==Crystal Structure Of tRNA-Guanine Transglycosylase (TGT) From Zymomonas mobilis Complexed With Archaeosine Precursor, Preq0==
 <StructureSection load='1p0b' size='340' side='right' caption='[[1p0b]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
@@ Line 7: / Line 8: @@
 <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='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='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=1p0b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1p0b OCA], [http://pdbe.org/1p0b PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1p0b RCSB], [http://www.ebi.ac.uk/pdbsum/1p0b PDBsum]</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=1p0b FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1p0b OCA], [http://pdbe.org/1p0b PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1p0b RCSB], [http://www.ebi.ac.uk/pdbsum/1p0b PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1p0b ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 15: / Line 16: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/p0/1p0b_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/p0/1p0b_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
@@ Line 30: / Line 31: @@
 </div>
 <div class="pdbe-citations 1p0b" style="background-color:#fffaf0;"></div>
-==See Also==
-*[[TRNA-guanine transglycosylase|TRNA-guanine transglycosylase]]
 == References ==
 <references/>

1p0b

From Proteopedia

Revision as of 07:27, 15 February 2018

Crystal Structure Of tRNA-Guanine Transglycosylase (TGT) From Zymomonas mobilis Complexed With Archaeosine Precursor, Preq0

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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