1efw
From Proteopedia
(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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| - | [[Image:1efw.gif|left|200px]]<br /><applet load="1efw" size=" | + | [[Image:1efw.gif|left|200px]]<br /><applet load="1efw" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1efw, resolution 3.00Å" /> | caption="1efw, resolution 3.00Å" /> | ||
'''CRYSTAL STRUCTURE OF ASPARTYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS COMPLEXED TO TRNAASP FROM ESCHERICHIA COLI'''<br /> | '''CRYSTAL STRUCTURE OF ASPARTYL-TRNA SYNTHETASE FROM THERMUS THERMOPHILUS COMPLEXED TO TRNAASP FROM ESCHERICHIA COLI'''<br /> | ||
==Overview== | ==Overview== | ||
| - | The crystal structures of aspartyl-tRNA synthetase (AspRS) from Thermus | + | 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== | ==About this Structure== | ||
| - | 1EFW is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] and [http://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus]. Active as [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] Full crystallographic information is available from [http:// | + | 1EFW is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] and [http://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus]. Active as [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] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EFW OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Moras, D.]] | [[Category: Moras, D.]] | ||
[[Category: Poterszman, A.]] | [[Category: Poterszman, A.]] | ||
| - | [[Category: Thierry, J | + | [[Category: Thierry, J C.]] |
[[Category: Webster, G.]] | [[Category: Webster, G.]] | ||
[[Category: aspartyl-trna synthetase]] | [[Category: aspartyl-trna synthetase]] | ||
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[[Category: trna]] | [[Category: trna]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:27:20 2008'' |
Revision as of 10:27, 21 February 2008
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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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