1C9S image
Entry Detail
PDB ID:
1C9S
Keywords:
RNA BINDING PROTEIN/RNA
Title:
CRYSTAL STRUCTURE OF A COMPLEX OF TRP RNA-BINDING ATTENUATION PROTEIN WITH A 53-BASE SINGLE STRANDED RNA CONTAINING ELEVEN GAG TRIPLETS SEPARATED BY AU DINUCLEOTIDES
Biological Source:
Source Organism:
Geobacillus stearothermophilus,
Host Organism:
Escherichia coli
PDB Version:
Deposition Date:
1999-08-03
Release Date:
1999-09-15
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
1.90 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.23
Space Group:
C 1 2 1
1C9S validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:TRP RNA-BINDING ATTENUATION PROTEIN
Chain IDs:B (auth: A), C (auth: B), D (auth: C), E (auth: D), F (auth: E), G (auth: F), H (auth: G), I (auth: H), J (auth: I), K (auth: J), L (auth: K), M (auth: L), N (auth: M), O (auth: N), P (auth: O), Q (auth: P), R (auth: Q), S (auth: R), T (auth: S), U (auth: T), V (auth: U), W (auth: V)
Chain Length:74
Number of Molecules:22
Biological Source:Geobacillus stearothermophilus
UniProt ID:Q9X6J6 Pfam ID:PF02081
Polymer Type:polyribonucleotide
Description:SINGLE STRANDED RNA (55-MER)
Chain IDs:A (auth: W)
Chain Length:55
Number of Molecules:1
Biological Source:
Ligand Molecules
TRP
Primary Citation
Structure of the trp RNA-binding attenuation protein, TRAP, bound to RNA.
Nature 401 235 242 (1999)
PMID: 10499579 DOI: 10.1038/45730

Abstact

The trp RNA-binding attenuation protein (TRAP) regulates expression of the tryptophan biosynthetic genes of several bacilli by binding single-stranded RNA. The binding sequence is composed of eleven triplet repeats, predominantly GAG, separated by two or three non-conserved nucleotides. Here we present the crystal structure of a complex of TRAP and a 53-base single-stranded RNA containing eleven GAG triplets, revealing that each triplet is accommodated in a binding pocket formed by beta-strands. In the complex, the RNA has an extended structure without any base-pairing and binds to the protein mostly by specific protein-base interactions. Eleven binding pockets on the circular TRAP 11-mer form a belt with a diameter of about 80 A. This simple but elegant mechanism of arresting the RNA segment by encircling it around a protein disk is applicable to both transcription, when TRAP binds the nascent RNA, and to translation, when TRAP binds the same sequence within a non-coding leader region of the messenger RNA.

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Primary Citation of related structures
1C9S