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1b23

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[[Image:1b23.gif|left|200px]]
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{{STRUCTURE_1b23| PDB=1b23 | SCENE= }}
{{STRUCTURE_1b23| PDB=1b23 | SCENE= }}
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'''E. coli cysteinyl-tRNA and T. aquaticus elongation factor EF-TU:GTP ternary complex'''
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===E. coli cysteinyl-tRNA and T. aquaticus elongation factor EF-TU:GTP ternary complex===
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==Overview==
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BACKGROUND:. The translation elongation factor EF-Tu in its GTP-bound state forms a ternary complex with any aminoacylated tRNA (aa-tRNA), except initiator tRNA and selenocysteinyl-tRNA. This complex delivers aa-tRNA to the ribosomal A site during the elongation cycle of translation. The crystal structure of the yeast Phe-tRNAPhe ternary complex with Thermus aquaticus EF-Tu-GDPNP (Phe-TC) has previously been determined as one representative of this general yet highly discriminating complex formation. RESULTS: The ternary complex of Escherichia coli Cys-tRNACys and T. aquaticus EF-Tu-GDPNP (Cys-TC) has been solved and refined at 2.6 degrees resolution. Conserved and variable features of the aa-tRNA recognition and binding by EF-Tu-GTP have been revealed by comparison with the Phe-TC structure. New tertiary interactions are observed in the tRNACys structure. A 'kissing complex' is observed in the very close crystal packing arrangement. CONCLUSIONS: The recognition of Cys-tRNACys by EF-Tu-GDPNP is restricted to the aa-tRNA motif previously identified in Phe-TC and consists of the aminoacylated 3' end, the phosphorylated 5' end and one side of the acceptor stem and T stem. The aminoacyl bond is recognized somewhat differently, yet by the same primary motif in EF-Tu, which suggests that EF-Tu adapts to subtle variations in this moiety among all aa-tRNAs. New tertiary interactions revealed by the Cys-tRNACys structure, such as a protonated C16:C59 pyrimidine pair, a G15:G48 'Levitt pair' and an s4U8:A14:A46 base triple add to the generic understanding of tRNA structure from sequence. The structure of the 'kissing complex' shows a quasicontinuous helix with a distinct shape determined by the number of base pairs.
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(as it appears on PubMed at http://www.pubmed.gov), where 10368282 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10368282}}
==About this Structure==
==About this Structure==
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[[Category: Transfer rna]]
[[Category: Transfer rna]]
[[Category: Translation elongation factor]]
[[Category: Translation elongation factor]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:57:56 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 18:03:41 2008''

Revision as of 15:03, 30 June 2008

Image:1b23.png

Template:STRUCTURE 1b23

E. coli cysteinyl-tRNA and T. aquaticus elongation factor EF-TU:GTP ternary complex

Template:ABSTRACT PUBMED 10368282

About this Structure

1B23 is a Single protein structure of sequence from Escherichia coli and Thermus aquaticus. Full crystallographic information is available from OCA.

Reference

The crystal structure of Cys-tRNACys-EF-Tu-GDPNP reveals general and specific features in the ternary complex and in tRNA., Nissen P, Thirup S, Kjeldgaard M, Nyborg J, Structure. 1999 Feb 15;7(2):143-56. PMID:10368282

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