6QEY image
Entry Detail
PDB ID:
6QEY
Title:
IMP1 KH1 and KH2 domains create a structural platform with unique RNA recognition and re-modelling properties
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2019-01-09
Release Date:
2019-03-27
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.24
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Insulin-like growth factor 2 mRNA-binding protein 1
Chain IDs:A
Chain Length:179
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
IMP1 KH1 and KH2 domains create a structural platform with unique RNA recognition and re-modelling properties.
Nucleic Acids Res. 47 4334 4348 (2019)
PMID: 30864660 DOI: 10.1093/nar/gkz136

Abstact

IGF2 mRNA-binding protein 1 (IMP1) is a key regulator of messenger RNA (mRNA) metabolism and transport in organismal development and, in cancer, its mis-regulation is an important component of tumour metastasis. IMP1 function relies on the recognition of a diverse set of mRNA targets that is mediated by the combinatorial action of multiple RNA-binding domains. Here, we dissect the structure and RNA-binding properties of two key RNA-binding domains of IMP1, KH1 and KH2, and we build a kinetic model for the recognition of RNA targets. Our data and model explain how the two domains are organized as an intermolecular pseudo-dimer and that the important role they play in mRNA target recognition is underpinned by the high RNA-binding affinity and fast kinetics of this KH1KH2-RNA recognition unit. Importantly, the high-affinity RNA-binding by KH1KH2 is achieved by an inter-domain coupling 50-fold stronger than that existing in a second pseudo-dimer in the protein, KH3KH4. The presence of this strong coupling supports a role of RNA re-modelling in IMP1 recognition of known cancer targets.

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