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1udz

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Revision as of 08:37, 21 March 2018

Isoleucyl-tRNA synthetase editing domain

Structural highlights

1udz is a 2 chain structure with sequence from "flavobacterium_thermophilum"_yoshida_and_oshima_1971 "flavobacterium thermophilum" yoshida and oshima 1971. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	1ue0
Gene:	iles ("Flavobacterium thermophilum" Yoshida and Oshima 1971)
Activity:	Isoleucine--tRNA ligase, with EC number 6.1.1.5
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT, TOPSAN

Function

[SYI_THET8] Catalyzes the attachment of isoleucine to tRNA(Ile). As IleRS can inadvertently accommodate and process structurally similar amino acids such as valine, to avoid such errors it has two additional distinct tRNA(Ile)-dependent editing activities. One activity is designated as 'pretransfer' editing and involves the hydrolysis of activated Val-AMP. The other activity is designated 'posttransfer' editing and involves deacylation of mischarged Val-tRNA(Ile) (By similarity).[HAMAP-Rule:MF_02003]

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

Isoleucyl-tRNA synthetase (IleRS) links tRNA(Ile) with not only its cognate isoleucine but also the nearly cognate valine. The CP1 domain of IleRS deacylates, or edits, the mischarged Val-tRNA(Ile). We determined the crystal structures of the Thermus thermophilus IleRS CP1 domain alone, and in its complex with valine at 1.8- and 2.0-A resolutions, respectively. In the complex structure, the Asp(328) residue, which was shown to be critical for the editing reaction against Val-tRNA(Ile) by a previous mutational analysis, recognizes the valine NH(3)(+) group. The valine side chain binding pocket is only large enough to accommodate valine, and the placement of an isoleucine model in this location revealed that the additional methylene group of isoleucine would clash with His(319). The H319A mutant of Escherichia coli IleRS reportedly deacylates the cognate Ile-tRNA(Ile) in addition to Val-tRNA(Ile), indicating that the valine-binding mode found in this study represents that in the Val-tRNA(Ile) editing reaction. Analyses of the Val-tRNA(Ile) editing activities of T. thermophilus IleRS mutants revealed the importance of Thr(228), Thr(229), Thr(230), and Asp(328), which are coordinated with water molecules in the present structure. The structural model for the Val-adenosine moiety of Val-tRNA(Ile) bound in the IleRS editing site revealed some interesting differences in the substrate binding and recognizing mechanisms between IleRS and T. thermophilus leucyl-tRNA synthetase. For example, the carbonyl oxygens of the amino acids are located opposite to each other, relative to the adenosine ribose ring, and are differently recognized.

Crystal structures of the CP1 domain from Thermus thermophilus isoleucyl-tRNA synthetase and its complex with L-valine.,Fukunaga R, Fukai S, Ishitani R, Nureki O, Yokoyama S J Biol Chem. 2004 Feb 27;279(9):8396-402. Epub 2003 Dec 12. PMID:14672940^[1]

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

References

↑ Fukunaga R, Fukai S, Ishitani R, Nureki O, Yokoyama S. Crystal structures of the CP1 domain from Thermus thermophilus isoleucyl-tRNA synthetase and its complex with L-valine. J Biol Chem. 2004 Feb 27;279(9):8396-402. Epub 2003 Dec 12. PMID:14672940 doi:10.1074/jbc.M312830200

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

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

@@ Line 1: / Line 1: @@
 ==Isoleucyl-tRNA synthetase editing domain==
 <StructureSection load='1udz' size='340' side='right' caption='[[1udz]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">iles ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=274 "Flavobacterium thermophilum" Yoshida and Oshima 1971])</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Isoleucine--tRNA_ligase Isoleucine--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.5 6.1.1.5] </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=1udz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1udz OCA], [http://pdbe.org/1udz PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1udz RCSB], [http://www.ebi.ac.uk/pdbsum/1udz PDBsum], [http://www.topsan.org/Proteins/RSGI/1udz TOPSAN]</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=1udz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1udz OCA], [http://pdbe.org/1udz PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1udz RCSB], [http://www.ebi.ac.uk/pdbsum/1udz PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1udz ProSAT], [http://www.topsan.org/Proteins/RSGI/1udz TOPSAN]</span></td></tr>
 </table>
 == Function ==
@@ Line 14: / Line 15: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ud/1udz_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ud/1udz_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

1udz

From Proteopedia

Revision as of 08:37, 21 March 2018

Isoleucyl-tRNA synthetase editing domain

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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