1qu2 | pdb_00001qu2
INSIGHTS INTO EDITING FROM AN ILE-TRNA SYNTHETASE STRUCTURE WITH TRNA(ILE) AND MUPIROCIN
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| 1qu2, resolution 2.20Å | |||||||||||||
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| Ligands: | A, C, G, K, MG, MRC, U, ZN | ||||||||||||
| Activity: | Isoleucine--tRNA ligase, with EC number 6.1.1.5 | ||||||||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
Overview
Isoleucyl-transfer RNA (tRNA) synthetase (IleRS) joins Ile to tRNA(Ile) at its synthetic active site and hydrolyzes incorrectly acylated amino acids at its editing active site. The 2.2 angstrom resolution crystal structure of Staphylococcus aureus IleRS complexed with tRNA(Ile) and Mupirocin shows the acceptor strand of the tRNA(Ile) in the continuously stacked, A-form conformation with the 3' terminal nucleotide in the editing active site. To position the 3' terminus in the synthetic active site, the acceptor strand must adopt the hairpinned conformation seen in tRNA(Gln) complexed with its synthetase. The amino acid editing activity of the IleRS may result from the incorrect products shuttling between the synthetic and editing active sites, which is reminiscent of the editing mechanism of DNA polymerases.
About this Structure
1QU2 is a Single protein structure of sequence from Staphylococcus aureus. Full crystallographic information is available from OCA.
Reference
Insights into editing from an ile-tRNA synthetase structure with tRNAile and mupirocin., Silvian LF, Wang J, Steitz TA, Science. 1999 Aug 13;285(5430):1074-7. PMID:10446055
Page seeded by OCA on Sun Mar 30 23:19:01 2008
