1asz

<table><tr><td colspan='2'>[[1asz]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. The April 2001 RCSB PDB [http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/index.html Molecule of the Month] feature on ''Aminoacyl-tRNA Synthetases'' by David S. Goodsell is [http://dx.doi.org/10.2210/rcsb_pdb/mom_2001_4 10.2210/rcsb_pdb/mom_2001_4]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ASZ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ASZ FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ATP:ADENOSINE-5-TRIPHOSPHATE'>ATP</scene></td></tr>

<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=1MG:1N-METHYLGUANOSINE-5-MONOPHOSPHATE'>1MG</scene>, <scene name='pdbligand=5MC:5-METHYLCYTIDINE-5-MONOPHOSPHATE'>5MC</scene>, <scene name='pdbligand=5MU:5-METHYLURIDINE+5-MONOPHOSPHATE'>5MU</scene>, <scene name='pdbligand=H2U:5,6-DIHYDROURIDINE-5-MONOPHOSPHATE'>H2U</scene>, <scene name='pdbligand=PSU:PSEUDOURIDINE-5-MONOPHOSPHATE'>PSU</scene></td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Aspartate--tRNA_ligase Aspartate--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.12 6.1.1.12] </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=1asz FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1asz OCA], [http://pdbe.org/1asz PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1asz RCSB], [http://www.ebi.ac.uk/pdbsum/1asz PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1asz ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

The crystal structures of the various complexes formed by yeast aspartyl-tRNA synthetase (AspRS) and its substrates provide snapshots of the active site corresponding to different steps of the aminoacylation reaction. Native crystals of the binary complex tRNA-AspRS were soaked in solutions containing the two other substrates, ATP (or its analog AMPPcP) and aspartic acid. When all substrates are present in the crystal, this leads to the formation of the aspartyl-adenylate and/or the aspartyl-tRNA. A class II-specific pathway for the aminoacylation reaction is proposed which explains the known functional differences between the two classes while preserving a common framework. Extended signature sequences characteristic of class II aaRS (motifs 2 and 3) constitute the basic functional unit. The ATP molecule adopts a bent conformation, stabilized by the invariant Arg531 of motif 3 and a magnesium ion coordinated to the pyrophosphate group and to two class-invariant acidic residues. The aspartic acid substrate is positioned by a class II invariant acidic residue, Asp342, interacting with the amino group and by amino acids conserved in the aspartyl synthetase family. The amino acids in contact with the substrates have been probed by site-directed mutagenesis for their functional implication.

The active site of yeast aspartyl-tRNA synthetase: structural and functional aspects of the aminoacylation reaction.,Cavarelli J, Eriani G, Rees B, Ruff M, Boeglin M, Mitschler A, Martin F, Gangloff J, Thierry JC, Moras D EMBO J. 1994 Jan 15;13(2):327-37. PMID:8313877<ref>PMID:8313877</ref>

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

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<div class="pdbe-citations 1asz" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Aspartate--tRNA ligase]]

[[Category: Cavarelli, J]]

[[Category: Moras, D]]

[[Category: Rees, B]]

[[Category: Thierry, J C]]