View source for 4tqd


==Crystal Structure of the C-terminal domain of IFRS bound with 3-iodo-L-Phe and ATP==
<StructureSection load='4tqd' size='340' side='right'caption='[[4tqd]], [[Resolution|resolution]] 2.14&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4tqd]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Methanosarcina_mazei_Go1 Methanosarcina mazei Go1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4TQD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4TQD FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1429&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=33S:3-IODO-L-PHENYLALANINE'>33S</scene>, <scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></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=4tqd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4tqd OCA], [https://pdbe.org/4tqd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4tqd RCSB], [https://www.ebi.ac.uk/pdbsum/4tqd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4tqd ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PYLS_METMA PYLS_METMA] Catalyzes the attachment of pyrrolysine to tRNA(Pyl). Pyrrolysine is a lysine derivative encoded by the termination codon UAG (By similarity).
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Pyrrolysyl-tRNA synthetase (PylRS) and its cognate tRNAPyl have emerged as ideal translation components for genetic code innovation. Variants of the enzyme facilitate the incorporation &gt;100 noncanonical amino acids (ncAAs) into proteins. PylRS variants were previously selected to acylate Nepsilon-acetyl-Lys (AcK) onto tRNAPyl. Here, we examine an Nepsilon-acetyl-lysyl-tRNA synthetase (AcKRS), which is polyspecific (i.e., active with a broad range of ncAAs) and 30-fold more efficient with Phe derivatives than it is with AcK. Structural and biochemical data reveal the molecular basis of polyspecificity in AcKRS and in a PylRS variant [iodo-phenylalanyl-tRNA synthetase (IFRS)] that displays both enhanced activity and substrate promiscuity over a chemical library of 313 ncAAs. IFRS, a product of directed evolution, has distinct binding modes for different ncAAs. These data indicate that in vivo selections do not produce optimally specific tRNA synthetases and suggest that translation fidelity will become an increasingly dominant factor in expanding the genetic code far beyond 20 amino acids.

Polyspecific pyrrolysyl-tRNA synthetases from directed evolution.,Guo LT, Wang YS, Nakamura A, Eiler D, Kavran JM, Wong M, Kiessling LL, Steitz TA, O'Donoghue P, Soll D Proc Natl Acad Sci U S A. 2014 Nov 10. pii: 201419737. PMID:25385624<ref>PMID:25385624</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4tqd" style="background-color:#fffaf0;"></div>

==See Also==
*[[Aminoacyl tRNA synthetase 3D structures|Aminoacyl tRNA synthetase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Methanosarcina mazei Go1]]
[[Category: Nakamura A]]
[[Category: O'Donoghue P]]
[[Category: Soll D]]