5SZW

NMR solution structure of the RRM1 domain of the post-transcriptional regulator HuR


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Oligomeric transition and dynamics of RNA binding by the HuR RRM1 domain in solution.

Lixa, C.Mujo, A.de Magalhaes, M.T.Q.Almeida, F.C.L.Lima, L.M.T.R.Pinheiro, A.S.

(2018) J. Biomol. NMR 72: 179-192

  • DOI: 10.1007/s10858-018-0217-y

  • PubMed Abstract: 
  • Human antigen R (HuR) functions as a major post-transcriptional regulator of gene expression through its RNA-binding activity. HuR is composed by three RNA recognition motifs, namely RRM1, RRM2, and RRM3. The two N-terminal RRM domains are disposed i ...

    Human antigen R (HuR) functions as a major post-transcriptional regulator of gene expression through its RNA-binding activity. HuR is composed by three RNA recognition motifs, namely RRM1, RRM2, and RRM3. The two N-terminal RRM domains are disposed in tandem and contribute mostly to HuR interaction with adenine and uracil-rich elements (ARE) in mRNA. Here, we used a combination of NMR and electrospray ionization-ion mobility spectrometry-mass spectrometry (ESI-IMS-MS) to characterize the structure, dynamics, RNA recognition, and dimerization of HuR RRM1. Our solution structure reveals a canonical RRM fold containing a 19-residue, intrinsically disordered N-terminal extension, which is not involved in RNA binding. NMR titration results confirm the primary RNA-binding site to the two central β-strands, β1 and β3, for a cyclooxygenase 2 (Cox2) ARE I-derived, 7-nucleotide RNA ligand. We show by 15 N relaxation that, in addition to the N- and C-termini, the β2-β3 loop undergoes fast backbone dynamics (ps-ns) both in the free and RNA-bound state, indicating that no structural ordering happens upon RNA interaction. ESI-IMS-MS reveals that HuR RRM1 dimerizes, however dimer population represents a minority. Dimerization occurs via the α-helical surface, which is oppositely orientated to the RNA-binding β-sheet. By using a DNA analog of the Cox2 ARE I, we show that DNA binding stabilizes HuR RRM1 monomer and shifts the monomer-dimer equilibrium toward the monomeric species. Altogether, our results deepen the current understanding of the mechanism of RNA recognition employed by HuR.


    Related Citations: 
    • (1)H, (15)N and (13)C resonance assignments of the RRM1 domain of the key post-transcriptional regulator HuR.
      Mujo, A.,Lixa, C.,Carneiro, L.A.,Anobom, C.D.,Almeida, F.C.,Pinheiro, A.S.
      (2015) Biomol NMR Assign 9: 281


    Organizational Affiliation

    Department of Biochemistry and Immunology, Federal University of Minas Gerais, Belo Horizonte, 31270-901, Brazil.,National Center for Nuclear Magnetic Resonance Jiri Jonas, Institute of Medical Biochemistry, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-902, Brazil.,Department of Biochemistry, Institute of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-909, Brazil.,Faculty of Pharmacy, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-590, Brazil.,Department of Biochemistry, Institute of Chemistry, Federal University of Rio de Janeiro, Rio de Janeiro, 21941-909, Brazil. pinheiro@iq.ufrj.br.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ELAV-like protein 1
A
101Homo sapiensMutation(s): 0 
Gene Names: ELAVL1 (HUR)
Find proteins for Q15717 (Homo sapiens)
Go to Gene View: ELAVL1
Go to UniProtKB:  Q15717
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
FAPERJBrazil--
Brazilian National Council for Scientific and Technological DevelopmentBrazil--
Brown University Brazil Initiative Colaboration GrantUnited States--

Revision History 

  • Version 1.0: 2017-09-06
    Type: Initial release
  • Version 1.1: 2019-03-27
    Type: Data collection, Database references
  • Version 1.2: 2019-04-17
    Type: Author supporting evidence, Data collection