3A6P image
Deposition Date 2009-09-07
Release Date 2009-12-08
Last Version Date 2024-11-13
Entry Detail
PDB ID:
3A6P
Title:
Crystal structure of Exportin-5:RanGTP:pre-miRNA complex
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.92 Å
R-Value Free:
0.31
R-Value Work:
0.24
R-Value Observed:
0.25
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Exportin-5
Gene (Uniprot):XPO5
Chain IDs:A, F
Chain Length:1204
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:13-mer peptide
Chain IDs:B, G
Chain Length:13
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:GTP-binding nuclear protein Ran
Gene (Uniprot):RAN
Chain IDs:C, H
Chain Length:216
Number of Molecules:2
Biological Source:Canis lupus familiaris
Primary Citation
A high-resolution structure of the pre-microRNA nuclear export machinery
Science 326 1275 1279 (2009)
PMID: 19965479 DOI: 10.1126/science.1178705

Abstact

Nuclear export of microRNAs (miRNAs) by exportin-5 (Exp-5) is an essential step in miRNA biogenesis. Here, we present the 2.9 angstrom structure of the pre-miRNA nuclear export machinery formed by pre-miRNA complexed with Exp-5 and a guanine triphosphate (GTP)-bound form of the small nuclear guanine triphosphatase (GTPase) Ran (RanGTP). The x-ray structure shows that Exp-5:RanGTP recognizes the 2-nucleotide 3' overhang structure and the double-stranded stem of the pre-miRNA. Exp-5:RanGTP shields the pre-miRNA stem from degradation in a baseball mitt-like structure where it is held by broadly distributed weak interactions, whereas a tunnel-like structure of Exp-5 interacts strongly with the 2-nucleotide 3' overhang through hydrogen bonds and ionic interactions. RNA recognition by Exp-5:RanGTP does not depend on RNA sequence, implying that Exp-5:RanGTP can recognize a variety of pre-miRNAs.

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