1B23 image
Entry Detail
PDB ID:
1B23
Title:
E. coli cysteinyl-tRNA and T. aquaticus elongation factor EF-TU:GTP ternary complex
Biological Source:
PDB Version:
Deposition Date:
1998-12-04
Release Date:
1998-12-07
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.26
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
F 2 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:ELONGATION FACTOR TU
Chain IDs:B (auth: P)
Chain Length:405
Number of Molecules:1
Biological Source:Thermus aquaticus
Polymer Type:polyribonucleotide
Description:CYSTEINYL TRNA
Chain IDs:A (auth: R)
Chain Length:74
Number of Molecules:1
Biological Source:Escherichia coli
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
4SU A U 4-THIOURIDINE-5'-MONOPHOSPHATE
5MU A U 5-METHYLURIDINE 5'-MONOPHOSPHATE
H2U A U 5,6-DIHYDROURIDINE-5'-MONOPHOSPHATE
MIA A A ?
PSU A U PSEUDOURIDINE-5'-MONOPHOSPHATE
Primary Citation
The crystal structure of Cys-tRNACys-EF-Tu-GDPNP reveals general and specific features in the ternary complex and in tRNA.
Structure Fold.Des. 7 143 156 (1999)
PMID: 10368282 DOI: 10.1016/S0969-2126(99)80021-5

Abstact

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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