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1n9w

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{{STRUCTURE_1n9w| PDB=1n9w | SCENE= }}
{{STRUCTURE_1n9w| PDB=1n9w | SCENE= }}
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'''Crystal structure of the non-discriminating and archaeal-type aspartyl-tRNA synthetase from Thermus thermophilus'''
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===Crystal structure of the non-discriminating and archaeal-type aspartyl-tRNA synthetase from Thermus thermophilus===
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==Overview==
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In most organisms, tRNA aminoacylation is ensured by 20 aminoacyl-tRNA synthetases (aaRSs). In eubacteria, however, synthetases can be duplicated as in Thermus thermophilus, which contains two distinct AspRSs. While AspRS-1 is specific, AspRS-2 is non-discriminating and aspartylates tRNA(Asp) and tRNA(Asn). The structure at 2.3 A resolution of AspRS-2, the first of a non-discriminating synthetase, was solved. It differs from that of AspRS-1 but has resemblance to that of discriminating and archaeal AspRS from Pyrococcus kodakaraensis. The protein presents non-conventional features in its OB-fold anticodon-binding domain, namely the absence of a helix inserted between two beta-strands of this fold and a peculiar L1 loop differing from the large loops known to interact with tRNA(Asp) identity determinant C36 in conventional AspRSs. In AspRS-2, this loop is small and structurally homologous to that in AsnRSs, including conservation of a proline. In discriminating Pyrococcus AspRS, the L1 loop, although small, lacks this proline and is not superimposable with that of AspRS-2 or AsnRS. Its particular status is demonstrated by a loop-exchange experiment that renders the Pyrococcus AspRS non-discriminating.
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(as it appears on PubMed at http://www.pubmed.gov), where 12660169 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12660169}}
==About this Structure==
==About this Structure==
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[[Category: Roy, H.]]
[[Category: Roy, H.]]
[[Category: Biosynthetic protein]]
[[Category: Biosynthetic protein]]
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Revision as of 11:29, 27 July 2008

Image:1n9w.png

Template:STRUCTURE 1n9w

Crystal structure of the non-discriminating and archaeal-type aspartyl-tRNA synthetase from Thermus thermophilus

Template:ABSTRACT PUBMED 12660169

About this Structure

1N9W is a Single protein structure of sequence from Thermus thermophilus. Full crystallographic information is available from OCA.

Reference

Non-discriminating and discriminating aspartyl-tRNA synthetases differ in the anticodon-binding domain., Charron C, Roy H, Blaise M, Giege R, Kern D, EMBO J. 2003 Apr 1;22(7):1632-43. PMID:12660169

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