1IBL image
Entry Detail
PDB ID:
1IBL
Keywords:
Title:
STRUCTURE OF THE THERMUS THERMOPHILUS 30S RIBOSOMAL SUBUNIT IN COMPLEX WITH A MESSENGER RNA FRAGMENT AND COGNATE TRANSFER RNA ANTICODON STEM-LOOP BOUND AT THE A SITE AND WITH THE ANTIBIOTIC PAROMOMYCIN
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2001-03-28
Release Date:
2001-05-04
Method Details:
Experimental Method:
Resolution:
3.11 Å
R-Value Free:
0.27
R-Value Work:
0.23
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polyribonucleotide
Description:16S RIBOSOMAL RNA
Chain IDs:A
Chain Length:1522
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S2
Chain IDs:E (auth: B)
Chain Length:256
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S3
Chain IDs:F (auth: C)
Chain Length:239
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S4
Chain IDs:G (auth: D)
Chain Length:209
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S5
Chain IDs:H (auth: E)
Chain Length:162
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S6
Chain IDs:I (auth: F)
Chain Length:101
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S7
Chain IDs:J (auth: G)
Chain Length:156
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S8
Chain IDs:K (auth: H)
Chain Length:138
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S9
Chain IDs:L (auth: I)
Chain Length:128
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S10
Chain IDs:M (auth: J)
Chain Length:105
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S11
Chain IDs:N (auth: K)
Chain Length:129
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S12
Chain IDs:O (auth: L)
Chain Length:135
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S13
Chain IDs:P (auth: M)
Chain Length:126
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S14
Chain IDs:Q (auth: N)
Chain Length:61
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S15
Chain IDs:R (auth: O)
Chain Length:89
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S16
Chain IDs:S (auth: P)
Chain Length:88
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S17
Chain IDs:T (auth: Q)
Chain Length:105
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S18
Chain IDs:U (auth: R)
Chain Length:88
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S19
Chain IDs:V (auth: S)
Chain Length:93
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN S20
Chain IDs:W (auth: T)
Chain Length:106
Number of Molecules:1
Biological Source:Thermus thermophilus
Polymer Type:polypeptide(L)
Description:30S RIBOSOMAL PROTEIN THX
Chain IDs:X (auth: V)
Chain Length:26
Number of Molecules:1
Biological Source:Thermus thermophilus
Primary Citation

Abstact

Crystal structures of the 30S ribosomal subunit in complex with messenger RNA and cognate transfer RNA in the A site, both in the presence and absence of the antibiotic paromomycin, have been solved at between 3.1 and 3.3 angstroms resolution. Cognate transfer RNA (tRNA) binding induces global domain movements of the 30S subunit and changes in the conformation of the universally conserved and essential bases A1492, A1493, and G530 of 16S RNA. These bases interact intimately with the minor groove of the first two base pairs between the codon and anticodon, thus sensing Watson-Crick base-pairing geometry and discriminating against near-cognate tRNA. The third, or "wobble," position of the codon is free to accommodate certain noncanonical base pairs. By partially inducing these structural changes, paromomycin facilitates binding of near-cognate tRNAs.

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Primary Citation of related structures