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1efw
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(New page: 200px<br /><applet load="1efw" size="450" color="white" frame="true" align="right" spinBox="true" caption="1efw, resolution 3.00Å" /> '''CRYSTAL STRUCTURE OF...)
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Revision as of 11:51, 20 November 2007
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CRYSTAL STRUCTURE OF ASPARTYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS COMPLEXED TO TRNAASP FROM ESCHERICHIA COLI
Overview
The crystal structures of aspartyl-tRNA synthetase (AspRS) from Thermus, thermophilus, a prokaryotic class IIb enzyme, complexed with tRNA(Asp), from either T. thermophilus or Escherichia coli reveal a potential, intermediate of the recognition process. The tRNA is positioned on the, enzyme such that it cannot be aminoacylated but adopts an overall, conformation similar to that observed in active complexes. While the, anticodon loop binds to the N-terminal domain of the enzyme in a manner, similar to that of the related active complexes, its aminoacyl acceptor, arm remains at the entrance of the active site, stabilized in its, intermediate conformational state by non-specific interactions with the, insertion and catalytic domains. The thermophilic nature of the enzyme, which manifests itself in a very low kinetic efficiency at 17 degrees C, the temperature at which the crystals were grown, is in agreement with the, relative stability of this non-productive conformational state. Based on, these data, a pathway for tRNA binding and recognition is proposed.
About this Structure
1EFW is a Protein complex structure of sequences from Escherichia coli and Thermus thermophilus. Active as Aspartate--tRNA ligase, with EC number 6.1.1.12 Full crystallographic information is available from OCA.
Reference
An intermediate step in the recognition of tRNA(Asp) by aspartyl-tRNA synthetase., Briand C, Poterszman A, Eiler S, Webster G, Thierry J, Moras D, J Mol Biol. 2000 Jun 16;299(4):1051-60. PMID:10843857
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