IMP1 KH1 and KH2 domains create a structural platform with unique RNA recognition and re-modelling properties

TY - JOUR

T1 - IMP1 KH1 and KH2 domains create a structural platform with unique RNA recognition and re-modelling properties

AU - Dagil, Robert

AU - Ball, Neil J.

AU - Ogrodowicz, Roksana W.

AU - Hobor, Fruzsina

AU - Purkiss, Andrew G.

AU - Kelly, Geoff

AU - Martin, Stephen R.

AU - Taylor, Ian A.

AU - Ramos, Andres

PY - 2019/5/7

Y1 - 2019/5/7

N2 - 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 RNAbinding 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 pseudodimer in the protein, KH3KH4. The presence of this strong coupling supports a role of RNA re-modelling in IMP1 recognition of known cancer targets.

AB - 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 RNAbinding 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 pseudodimer in the protein, KH3KH4. The presence of this strong coupling supports a role of RNA re-modelling in IMP1 recognition of known cancer targets.

U2 - 10.1093/nar/gkz136

DO - 10.1093/nar/gkz136

M3 - Journal article

C2 - 30864660

AN - SCOPUS:85068537450

SN - 0305-1048

VL - 47

SP - 4334

EP - 4348

JO - Nucleic Acids Research

JF - Nucleic Acids Research

IS - 8

ER -