1wq3

==Escherichia coli tyrosyl-tRNA synthetase mutant comlexed with 3-iodo-L-tyrosine==

<StructureSection load='1wq3' size='340' side='right' caption='[[1wq3]], [[Resolution|resolution]] 2.00&Aring;' scene=''>

<table><tr><td colspan='2'>[[1wq3]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli_str._k-12_substr._w3110 Escherichia coli str. k-12 substr. w3110]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1WQ3 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1WQ3 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=IYR:3-IODO-TYROSINE'>IYR</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1wq4|1wq4]]</td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">tyrS ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=316407 Escherichia coli str. K-12 substr. W3110])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Tyrosine--tRNA_ligase Tyrosine--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.1 6.1.1.1] </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=1wq3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1wq3 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1wq3 RCSB], [http://www.ebi.ac.uk/pdbsum/1wq3 PDBsum], [http://www.topsan.org/Proteins/RSGI/1wq3 TOPSAN]</span></td></tr>

[[http://www.uniprot.org/uniprot/SYY_ECOLI SYY_ECOLI]] Catalyzes the attachment of tyrosine to tRNA(Tyr) in a two-step reaction: tyrosine is first activated by ATP to form Tyr-AMP and then transferred to the acceptor end of tRNA(Tyr).[HAMAP-Rule:MF_02006]

<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/wq/1wq3_consurf.spt"</scriptWhenChecked>

</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].

<div style="background-color:#fffaf0;">

== Publication Abstract from PubMed ==

The genetic code in a eukaryotic system has been expanded by the engineering of Escherichia coli tyrosyl-tRNA synthetase (TyrRS) with the Y37V and Q195C mutations (37V195C), which specifically recognize 3-iodo-L-tyrosine rather than L-tyrosine. In the present study, we determined the 3-iodo-L-tyrosine- and L-tyrosine-bound structures of the 37V195C mutant of the E. coli TyrRS catalytic domain at 2.0-A resolution. The gamma-methyl group of Val-37 and the sulfur atom of Cys-195 make van der Waals contacts with the iodine atom of 3-iodo-L-tyrosine. The Val-37 and Cys-195 side chains are rigidly fixed by the neighboring residues forming the hydrophobic core of the TyrRS. The major roles of the two mutations are different for the 3-iodo-L-tyrosine-selective recognition in the first step of the aminoacylation reaction (the amino acid activation step): the Y37V mutation eliminates the fatal steric repulsion with the iodine atom, and the Q195C mutation reduces the L-tyrosine misrecognition. The structure of the 37V195C mutant TyrRS complexed with an L-tyrosyladenylate analogue was also solved, indicating that the 3-iodo-L-tyrosine and L-tyrosine side chains are similarly discriminated in the second step (the aminoacyl transfer step). These results demonstrate that the amino acid-binding pocket on the 37V195C mutant is optimized for specific 3-iodo-L-tyrosine recognition.

Structural basis of nonnatural amino acid recognition by an engineered aminoacyl-tRNA synthetase for genetic code expansion.,Kobayashi T, Sakamoto K, Takimura T, Sekine R, Kelly VP, Kamata K, Nishimura S, Yokoyama S Proc Natl Acad Sci U S A. 2005 Feb 1;102(5):1366-71. Epub 2005 Jan 25. PMID:15671170<ref>PMID:15671170</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

</div>

*[[Aminoacyl tRNA Synthetase|Aminoacyl tRNA Synthetase]]

[[Category: Escherichia coli str. k-12 substr. w3110]]

[[Category: Tyrosine--tRNA ligase]]

[[Category: Kamata, K]]

[[Category: Kobayashi, T]]

[[Category: Nishimura, S]]

[[Category: Nureki, O]]

[[Category: Structural genomic]]

[[Category: Sakamoto, K]]

[[Category: Sekine, R]]

[[Category: Takimura, T]]

[[Category: Yokoyama, S]]

[[Category: Rsgi]]