ISDA

Deposition Date 2003-06-12

Release Date 2003-07-15

Last Version Date 2024-02-14

Entry Detail

PDB ID:

1PN8

Keywords:

RNA binding protein/RNA

Title:

Coordinates of S12, L11 proteins and E-site tRNA from 70S crystal structure separately fitted into the Cryo-EM map of E.coli 70S.EF-G.GDPNP complex. The atomic coordinates originally from the E-site tRNA were fitted in the position of the hybrid P/E-site tRNA.

Biological Source:

Source Organism:

Thermus thermophilus (Taxon ID: 274)
Thermotoga maritima (Taxon ID: 2336)

Method Details:

Experimental Method:

ELECTRON MICROSCOPY

Resolution:

10.80 Å

Aggregation State:

PARTICLE

Reconstruction Method:

SINGLE PARTICLE

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:50S ribosomal protein L11
Gene (Uniprot):rplK
Chain IDs:C (auth: L)
Chain Length:133
Number of Molecules:1
Biological Source:Thermotoga maritima

UniProt ID:P29395 Pfam ID:PF03946, PF00298

Protein Blast

Polymer Type:polypeptide(L)
Molecule:30S ribosomal protein S12
Gene (Uniprot):rpsL
Chain IDs:B (auth: O)
Chain Length:124
Number of Molecules:1
Biological Source:Thermus thermophilus

UniProt ID:Q5SHN3 Pfam ID:PF00164

Ligand Molecules

Primary Citation

Locking and Unlocking of Ribosomal Motions

Valle, M, Zavialov, A, Sengupta, J, Rawat, U, Ehrenberg, M, Frank, J.Show

Cell(Cambridge,Mass.) 114 123 134 (2003)

PMID: 12859903 DOI: 10.1016/S0092-8674(03)00476-8

Abstact

During the ribosomal translocation, the binding of elongation factor G (EF-G) to the pretranslocational ribosome leads to a ratchet-like rotation of the 30S subunit relative to the 50S subunit in the direction of the mRNA movement. By means of cryo-electron microscopy we observe that this rotation is accompanied by a 20 A movement of the L1 stalk of the 50S subunit, implying that this region is involved in the translocation of deacylated tRNAs from the P to the E site. These ribosomal motions can occur only when the P-site tRNA is deacylated. Prior to peptidyl-transfer to the A-site tRNA or peptide removal, the presence of the charged P-site tRNA locks the ribosome and prohibits both of these motions.

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Primary Citation of related structures