1UDZ

Isoleucyl-tRNA synthetase editing domain

Summary for 1UDZ

• Entry DOI: 10.2210/pdb1udz/pdb
• Related: 1UE0
• Descriptor: Isoleucyl-tRNA synthetase (2 entities in total)
• Functional Keywords: aminoacyl-trna synthetase, cp1, editing, structural genomics, nppsfa, national project on protein structural and functional analyses, riken structural genomics/proteomics initiative, rsgi, ligase
• Biological source: Thermus thermophilus
• Total number of polymer chains: 2
• Total formula weight: 40324.15

Authors

Fukunaga, R.,Fukai, S.,Ishitani, R.,Nureki, O.,Yokoyama, S.,RIKEN Structural Genomics/Proteomics Initiative (RSGI) (deposition date: 2003-05-08, release date: 2004-03-23, Last modification date: 2024-04-03)

Primary citation

Fukunaga, R.,Fukai, S.,Ishitani, R.,Nureki, O.,Yokoyama, S.
Crystal structures of the CP1 domain from Thermus thermophilus isoleucyl-tRNA synthetase and its complex with L-valine.
J.Biol.Chem., 279:8396-8402, 2004

PubMed Abstract: Isoleucyl-tRNA synthetase (IleRS) links tRNA(Ile) with not only its cognate isoleucine but also the nearly cognate valine. The CP1 domain of IleRS deacylates, or edits, the mischarged Val-tRNA(Ile). We determined the crystal structures of the Thermus thermophilus IleRS CP1 domain alone, and in its complex with valine at 1.8- and 2.0-A resolutions, respectively. In the complex structure, the Asp(328) residue, which was shown to be critical for the editing reaction against Val-tRNA(Ile) by a previous mutational analysis, recognizes the valine NH(3)(+) group. The valine side chain binding pocket is only large enough to accommodate valine, and the placement of an isoleucine model in this location revealed that the additional methylene group of isoleucine would clash with His(319). The H319A mutant of Escherichia coli IleRS reportedly deacylates the cognate Ile-tRNA(Ile) in addition to Val-tRNA(Ile), indicating that the valine-binding mode found in this study represents that in the Val-tRNA(Ile) editing reaction. Analyses of the Val-tRNA(Ile) editing activities of T. thermophilus IleRS mutants revealed the importance of Thr(228), Thr(229), Thr(230), and Asp(328), which are coordinated with water molecules in the present structure. The structural model for the Val-adenosine moiety of Val-tRNA(Ile) bound in the IleRS editing site revealed some interesting differences in the substrate binding and recognizing mechanisms between IleRS and T. thermophilus leucyl-tRNA synthetase. For example, the carbonyl oxygens of the amino acids are located opposite to each other, relative to the adenosine ribose ring, and are differently recognized.

PubMed: 14672940
DOI: 10.1074/jbc.M312830200

Experimental method

X-RAY DIFFRACTION (1.8 Å)