View source for 4n0h


==Crystal structure of S. cerevisiae mitochondrial GatFAB==
<StructureSection load='4n0h' size='340' side='right'caption='[[4n0h]], [[Resolution|resolution]] 1.95&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4n0h]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae_S288C Saccharomyces cerevisiae S288C]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4N0H OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4N0H FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=NO3:NITRATE+ION'>NO3</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=4n0h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4n0h OCA], [https://pdbe.org/4n0h PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4n0h RCSB], [https://www.ebi.ac.uk/pdbsum/4n0h PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4n0h ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GATA_YEAST GATA_YEAST] Allows the formation of correctly charged Gln-tRNA(Gln) through the transamidation of misacylated Glu-tRNA(Gln) in the mitochondria. The reaction takes place in the presence of glutamine and ATP through an activated gamma-phospho-Glu-tRNA(Gln). Required for HMG2-induced ER-remodeling.<ref>PMID:19417106</ref> <ref>PMID:18667535</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Yeast mitochondrial Gln-mtRNAGln is synthesized by the transamidation of mischarged Glu-mtRNAGln by a non-canonical heterotrimeric tRNA-dependent amidotransferase (AdT). The GatA and GatB subunits of the yeast AdT (GatFAB) are well conserved among bacteria and eukaryota, but the GatF subunit is a fungi-specific ortholog of the GatC subunit found in all other known heterotrimeric AdTs (GatCAB). Here we report the crystal structure of yeast mitochondrial GatFAB at 2.0 A resolution. The C-terminal region of GatF encircles the GatA-GatB interface in the same manner as GatC, but the N-terminal extension domain (NTD) of GatF forms several additional hydrophobic and hydrophilic interactions with GatA. NTD-deletion mutants displayed growth defects, but retained the ability to respire. Truncation of the NTD in purified mutants reduced glutaminase and transamidase activities when glutamine was used as the ammonia donor, but increased transamidase activity relative to the full-length enzyme when the donor was ammonium chloride. Our structure-based functional analyses suggest the NTD is a trans-acting scaffolding peptide for the GatA glutaminase active site. The positive surface charge and novel fold of the GatF-GatA interface, shown in this first crystal structure of an organellar AdT, stand in contrast with the more conventional, negatively charged bacterial AdTs described previously.

Crystal structure of Saccharomyces cerevisiae mitochondrial GatFAB reveals a novel subunit assembly in tRNA-dependent amidotransferases.,Araiso Y, Huot JL, Sekiguchi T, Frechin M, Fischer F, Enkler L, Senger B, Ishitani R, Becker HD, Nureki O Nucleic Acids Res. 2014 Apr 1. PMID:24692665<ref>PMID:24692665</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4n0h" style="background-color:#fffaf0;"></div>

==See Also==
*[[Glutamyl-tRNA(Gln) amidotransferase|Glutamyl-tRNA(Gln) amidotransferase]]
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae S288C]]
[[Category: Araiso Y]]
[[Category: Ishitani R]]
[[Category: Nureki O]]