4REO image
Deposition Date 2014-09-23
Release Date 2015-03-18
Last Version Date 2023-09-20
Entry Detail
PDB ID:
4REO
Title:
Mutant ribosomal protein l1 from thermus thermophilus with threonine 217 replaced by valine
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.35 Å
R-Value Free:
0.20
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L1
Gene (Uniprot):rplA
Mutations:T217V
Chain IDs:A
Chain Length:229
Number of Molecules:1
Biological Source:Thermus thermophilus
Primary Citation
Protein-RNA affinity of ribosomal protein L1 mutants does not correlate with the number of intermolecular interactions.
Acta Crystallogr.,Sect.D 71 376 386 (2015)
PMID: 25664749 DOI: 10.1107/S1399004714026248

Abstact

Ribosomal protein L1, as part of the L1 stalk of the 50S ribosomal subunit, is implicated in directing tRNA movement through the ribosome during translocation. High-resolution crystal structures of four mutants (T217V, T217A, M218L and G219V) of the ribosomal protein L1 from Thermus thermophilus (TthL1) in complex with a specific 80 nt fragment of 23S rRNA and the structures of two of these mutants (T217V and G219V) in the RNA-unbound form are reported in this work. All mutations are located in the highly conserved triad Thr-Met-Gly, which is responsible for about 17% of all protein-RNA hydrogen bonds and 50% of solvent-inaccessible intermolecular hydrogen bonds. In the mutated proteins without bound RNA the RNA-binding regions show substantial conformational changes. On the other hand, in the complexes with RNA the structures of the RNA-binding surfaces in all studied mutants are very similar to the structure of the wild-type protein in complex with RNA. This shows that formation of the RNA complexes restores the distorted surfaces of the mutant proteins to a conformation characteristic of the wild-type protein complex. Domain I of the mutated TthL1 and helix 77 of 23S rRNA form a rigid body identical to that found in the complex of wild-type TthL1 with RNA, suggesting that the observed relative orientation is conserved and is probably important for ribosome function. Analysis of the complex structures and the kinetic data show that the number of intermolecular contacts and hydrogen bonds in the RNA-protein contact area does not correlate with the affinity of the protein for RNA and cannot be used as a measure of affinity.

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Primary Citation of related structures