7CSL image
Deposition Date 2020-08-15
Release Date 2021-06-23
Last Version Date 2023-11-29
Entry Detail
PDB ID:
7CSL
Keywords:
Title:
Crystal structure of the archaeal EF1A-EF1B complex
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.27
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Elongation factor 1-alpha
Gene (Uniprot):tuf
Chain IDs:A, B
Chain Length:434
Number of Molecules:2
Biological Source:Pyrococcus horikoshii OT-3
Polymer Type:polypeptide(L)
Molecule:Elongation factor 1-beta
Gene (Uniprot):ef1b
Chain IDs:C, D
Chain Length:91
Number of Molecules:2
Biological Source:Pyrococcus horikoshii OT-3
Primary Citation
Structural insights into the Switching Off of the Interaction between the Archaeal Ribosomal Stalk and aEF1A by Nucleotide Exchange Factor aEF1B.
J.Mol.Biol. 433 167046 167046 (2021)
PMID: 33971210 DOI: 10.1016/j.jmb.2021.167046

Abstact

The ribosomal stalk protein plays a crucial role in functional interactions with translational GTPase factors. It has been shown that the archaeal stalk aP1 binds to both GDP- and GTP-bound conformations of aEF1A through its C-terminal region in two different modes. To obtain an insight into how the aP1•aEF1A binding mode changes during the process of nucleotide exchange from GDP to GTP on aEF1A, we have analyzed structural changes in aEF1A upon binding of the nucleotide exchange factor aEF1B. The isolated archaeal aEF1B has nucleotide exchange ability in the presence of aa-tRNA but not deacylated tRNA, and increases activity of polyphenylalanine synthesis 4-fold. The aEF1B mutation, R90A, results in loss of its original nucleotide exchange activity but retains a remarkable ability to enhance polyphenylalanine synthesis. These results suggest an additional functional role for aEF1B other than in nucleotide exchange. The crystal structure of the aEF1A•aEF1B complex, resolved at 2.0 Å resolution, shows marked rotational movement of domain 1 of aEF1A compared to the structure of aEF1A•GDP•aP1, and this conformational change results in disruption of the original aP1 binding site between domains 1 and 3 of aEF1A. The loss of aP1 binding to the aEF1A•aEF1B complex was confirmed by native gel analysis. The results suggest that aEF1B plays a role in switching off the interaction between aP1 and aEF1A•GDP, as well as in nucleotide exchange, and promote translation elongation.

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