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==Crystal structure of the catalytic domain of pyrrolysyl-tRNA synthetase in complex with pyrrolysine and an ATP analogue== | |||
<StructureSection load='2zce' size='340' side='right' caption='[[2zce]], [[Resolution|resolution]] 1.80Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2zce]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Dsm_2053 Dsm 2053]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2ZCE OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ZCE FirstGlance]. <br> | |||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ANP:PHOSPHOAMINOPHOSPHONIC+ACID-ADENYLATE+ESTER'>ANP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PYL:PYRROLYSINE'>PYL</scene><br> | |||
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2e3c|2e3c]], [[2zcd|2zcd]]</td></tr> | |||
<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">pylS ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=2209 DSM 2053])</td></tr> | |||
<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Pyrrolysine--tRNA(Pyl)_ligase Pyrrolysine--tRNA(Pyl) ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.26 6.1.1.26] </span></td></tr> | |||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2zce FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2zce OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2zce RCSB], [http://www.ebi.ac.uk/pdbsum/2zce PDBsum], [http://www.topsan.org/Proteins/RSGI/2zce TOPSAN]</span></td></tr> | |||
<table> | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/zc/2zce_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</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="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Pyrrolysine, a lysine derivative with a bulky pyrroline ring, is the "22nd" genetically encoded amino acid. In the present study, the carboxy-terminal catalytic fragment of Methanosarcina mazei pyrrolysyl-tRNA synthetase (PylRS) was analyzed by X-ray crystallography and site-directed mutagenesis. The catalytic fragment ligated tRNA(Pyl) with pyrrolysine nearly as efficiently as the full-length PylRS. We determined the crystal structures of the PylRS catalytic fragment in the substrate-free, ATP analogue (AMPPNP)-bound, and AMPPNP/pyrrolysine-bound forms, and compared them with the previously-reported PylRS structures. The ordering loop and the motif-2 loop undergo conformational changes from the "open" states to the "closed" states upon AMPPNP binding. On the other hand, the beta 7-beta 8 hairpin exhibits multiple conformational states, the open, intermediate (beta 7-open/beta 8-open and beta 7-closed/beta 8-open), and closed states, which are not induced upon substrate binding. The PylRS structures with a docked tRNA suggest that the active-site pocket can accommodate the CCA terminus of tRNA when the motif-2 loop is in the closed state and the beta 7-beta 8 hairpin is in the open or intermediate state. The entrance of the active-site pocket is nearly closed in the closed state of the beta 7-beta 8 hairpin, which may protect the pyrrolysyladenylate intermediate in the absence of tRNA(Pyl). Moreover, a structure-based mutational analysis revealed that hydrophobic residues in the amino acid-binding tunnel are important for accommodating the pyrrolysine side chain and that Asn346 is essential for anchoring the side-chain carbonyl and alpha-amino groups of pyrrolysine. In addition, a docking model of PylRS with tRNA was constructed based on the aspartyl-tRNA synthetase/tRNA structure, and was confirmed by a mutational analysis. | |||
Crystallographic studies on multiple conformational states of active-site loops in pyrrolysyl-tRNA synthetase.,Yanagisawa T, Ishii R, Fukunaga R, Kobayashi T, Sakamoto K, Yokoyama S J Mol Biol. 2008 May 2;378(3):634-52. Epub 2008 Feb 29. PMID:18387634<ref>PMID:18387634</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
==See Also== | ==See Also== | ||
| Line 13: | Line 32: | ||
*[[Pyrrolysine|Pyrrolysine]] | *[[Pyrrolysine|Pyrrolysine]] | ||
*[[Pyrrolysyl-tRNA synthetase|Pyrrolysyl-tRNA synthetase]] | *[[Pyrrolysyl-tRNA synthetase|Pyrrolysyl-tRNA synthetase]] | ||
== References == | |||
== | <references/> | ||
__TOC__ | |||
</StructureSection> | |||
[[Category: Dsm 2053]] | |||
[[Category: Ishii, R.]] | [[Category: Ishii, R.]] | ||
[[Category: RSGI, RIKEN Structural Genomics/Proteomics Initiative.]] | [[Category: RSGI, RIKEN Structural Genomics/Proteomics Initiative.]] | ||
