NMR structure of the La module from human LARP4A

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


LARP4A recognizes polyA RNA via a novel binding mechanism mediated by disordered regions and involving the PAM2w motif, revealing interplay between PABP, LARP4A and mRNA.

Cruz-Gallardo, I.Martino, L.Kelly, G.Atkinson, R.A.Trotta, R.De Tito, S.Coleman, P.Ahdash, Z.Gu, Y.Bui, T.T.T.Conte, M.R.

(2019) Nucleic Acids Res 47: 4272-4291

  • DOI: https://doi.org/10.1093/nar/gkz144
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    LARP4A belongs to the ancient RNA-binding protein superfamily of La-related proteins (LARPs). In humans, it acts mainly by stabilizing mRNAs, enhancing translation and controlling polyA lengths of heterologous mRNAs. These activities are known to implicate its association with mRNA, protein partners and translating ribosomes, albeit molecular details are missing. Here, we characterize the direct interaction between LARP4A, oligoA RNA and the MLLE domain of the PolyA-binding protein (PABP). Our study shows that LARP4A-oligoA association entails novel RNA recognition features involving the N-terminal region of the protein that exists in a semi-disordered state and lacks any recognizable RNA-binding motif. Against expectations, we show that the La module, the conserved RNA-binding unit across LARPs, is not the principal determinant for oligoA interaction, only contributing to binding to a limited degree. Furthermore, the variant PABP-interacting motif 2 (PAM2w) featured in the N-terminal region of LARP4A was found to be important for both RNA and PABP recognition, revealing a new role for this protein-protein binding motif. Our analysis demonstrates the mutual exclusive nature of the PAM2w-mediated interactions, thereby unveiling a tantalizing interplay between LARP4A, polyA and PABP.

  • Organizational Affiliation

    Randall Centre for Cell and Molecular Biophysics, King's College London, London SE1 1UL, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
La-related protein 4177Homo sapiensMutation(s): 0 
Gene Names: LARP4PP13296
UniProt & NIH Common Fund Data Resources
Find proteins for Q71RC2 (Homo sapiens)
Explore Q71RC2 
Go to UniProtKB:  Q71RC2
GTEx:  ENSG00000161813 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ71RC2
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 300 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Royal SocietyUnited KingdomNF140482
European Molecular Biology OrganizationUnited KingdomALT400-2010
European CommissionUnited Kingdom655341

Revision History  (Full details and data files)

  • Version 1.0: 2019-03-13
    Type: Initial release
  • Version 1.1: 2019-05-08
    Changes: Data collection
  • Version 1.2: 2019-07-03
    Changes: Data collection, Database references
  • Version 1.3: 2022-07-13
    Changes: Data collection, Database references, Structure summary
  • Version 1.4: 2023-06-14
    Changes: Other