2q7g

<table><tr><td colspan='2'>[[2q7g]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Dsm_2053 Dsm 2053]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2Q7G OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2Q7G FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=CCL:N~6~-[(CYCLOPENTYLOXY)CARBONYL]-D-LYSINE'>CCL</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">pylS ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=2209 DSM 2053])</td></tr>

[[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 ==

Pyrrolysine (Pyl), the 22nd natural amino acid and genetically encoded by UAG, becomes attached to its cognate tRNA by pyrrolysyl-tRNA synthetase (PylRS). We have determined three crystal structures of the Methanosarcina mazei PylRS complexed with either AMP-PNP, Pyl-AMP plus pyrophosphate, or the Pyl analogue N-epsilon-[(cylopentyloxy)carbonyl]-L-lysine plus ATP. The structures reveal that PylRS utilizes a deep hydrophobic pocket for recognition of the Pyl side chain. A comparison of these structures with previously determined class II tRNA synthetase complexes illustrates that different substrate specificities derive from changes in a small number of residues that form the substrate side-chain-binding pocket. The knowledge of these structures allowed the placement of PylRS in the aminoacyl-tRNA synthetase (aaRS) tree as the last known synthetase that evolved for genetic code expansion, as well as the finding that Pyl arose before the last universal common ancestral state. The PylRS structure provides an excellent framework for designing new aaRSs with altered amino acid specificity.

Structure of pyrrolysyl-tRNA synthetase, an archaeal enzyme for genetic code innovation.,Kavran JM, Gundllapalli S, O'Donoghue P, Englert M, Soll D, Steitz TA Proc Natl Acad Sci U S A. 2007 Jul 3;104(27):11268-73. Epub 2007 Jun 25. PMID:17592110<ref>PMID:17592110</ref>

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

</div>

<div class="pdbe-citations 2q7g" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Dsm 2053]]

[[Category: Kavran, J M]]

[[Category: Steitz, T A]]

[[Category: Ligase]]

[[Category: Pyrrolysyl-trna syntethetase]]