1L9A image
Deposition Date 2002-03-22
Release Date 2002-06-28
Last Version Date 2024-02-14
Entry Detail
PDB ID:
1L9A
Keywords:
SIGNALING PROTEIN/RNA
Title:
CRYSTAL STRUCTURE OF SRP19 IN COMPLEX WITH THE S DOMAIN OF SIGNAL RECOGNITION PARTICLE RNA
Biological Source:
Source Organism:
Methanocaldococcus jannaschii (Taxon ID: 2190)
(Taxon ID: )
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.90 Å
R-Value Free:
0.29
R-Value Work:
0.26
R-Value Observed:
0.26
Space Group:
P 21 21 2
1L9A validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:SIGNAL RECOGNITION PARTICLE 19 KDA PROTEIN
Gene (Uniprot):srp19
Mutations:C61A, C63R, C80A, Q74C
Chain IDs:B (auth: A)
Chain Length:87
Number of Molecules:1
Biological Source:Methanocaldococcus jannaschii
UniProt ID:Q58440 Pfam ID:PF01922
Polymer Type:polyribonucleotide
Molecule:signal recognition particle RNA S domain
Mutations:C112G, G113A, G238U, G239C
Chain IDs:A (auth: B)
Chain Length:128
Number of Molecules:1
Biological Source:
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
CCC A C ?
Ligand Molecules
MG
MMC
Primary Citation
Crystal structure of SRP19 in complex with the S domain of SRP RNA and its implication for the assembly of the signal recognition particle.
Mol.Cell 9 1251 1261 (2002)
PMID: 12086622 DOI: 10.1016/S1097-2765(02)00530-0

Abstact

The signal recognition particle (SRP) is a ribonucleoprotein particle involved in GTP-dependent translocation of secretory proteins across membranes. In Archaea and Eukarya, SRP19 binds to 7SL RNA and promotes the incorporation of SRP54, which contains the binding sites for GTP, the signal peptide, and the membrane-bound SRP receptor. We have determined the crystal structure of Methanococcus jannaschii SRP19 bound to the S domain of human 7SL RNA at 2.9 A resolution. SRP19 clamps the tetraloops of two branched helices (helices 6 and 8) and allows them to interact side by side. Helix 6 acts as a splint for helix 8 and partially preorganizes the binding site for SRP54 in helix 8, thereby facilitating the binding of SRP54 in assembly.

Legend

Protein

Chemical

Disease

Primary Citation of related structures
1L9A