Structural Characterization of the Mengovirus Leader Protein Bound to Ran GTPase by Nuclear Magnetic Resonance

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Solution structures of Mengovirus Leader protein, its phosphorylated derivatives, and in complex with nuclear transport regulatory protein, RanGTPase.

Bacot-Davis, V.R.Ciomperlik, J.J.Basta, H.A.Cornilescu, C.C.Palmenberg, A.C.

(2014) Proc Natl Acad Sci U S A 111: 15792-15797

  • DOI: https://doi.org/10.1073/pnas.1411098111
  • Primary Citation of Related Structures:  
    2MMG, 2MMH, 2MMI, 2MMK, 2MML

  • PubMed Abstract: 

    Cardiovirus Leader (L) proteins induce potent antihost inhibition of active cellular nucleocytoplasmic trafficking by triggering aberrant hyperphosphorylation of nuclear pore proteins (Nup). To achieve this, L binds protein RanGTPase (Ran), a key trafficking regulator, and diverts it into tertiary or quaternary complexes with required kinases. The activity of L is regulated by two phosphorylation events not required for Ran binding. Matched NMR studies on the unphosphorylated, singly, and doubly phosphorylated variants of Mengovirus L (L(M)) show both modifications act together to partially stabilize a short internal α-helix comprising L(M) residues 43-46. This motif implies that ionic and Van der Waals forces contributed by phosphorylation help organize downstream residues 48-67 into a new interface. The full structure of L(M) as bound to Ran (unlabeled) and Ran (216 aa) as bound by L(M) (unlabeled) places L(M) into the BP1 binding site of Ran, wrapped by the conformational flexible COOH tail. The arrangement explains the tight KD for this complex and places the LM zinc finger and phosphorylation interface as surface exposed and available for subsequent reactions. The core structure of Ran, outside the COOH tail, is not altered by L(M) binding and remains accessible for canonical RanGTP partner interactions. Pull-down assays identify at least one putative Ran:L(M) partner as an exportin, Crm1, or CAS. A model of Ran:L(M):Crm1, based on the new structures suggests LM phosphorylation status may mediate Ran's selection of exportin(s) and cargo(s), perverting these native trafficking elements into the lethal antihost Nup phosphorylation pathways.

  • Organizational Affiliation

    Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GTP-binding nuclear protein Ran216Homo sapiensMutation(s): 0 
Gene Names: ARA24OK/SW-cl.81RANRan GTPase
EC: 3.6.5
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Find proteins for P62826 (Homo sapiens)
Explore P62826 
Go to UniProtKB:  P62826
PHAROS:  P62826
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UniProt GroupP62826
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-15
    Type: Initial release
  • Version 1.1: 2014-11-05
    Changes: Database references
  • Version 1.2: 2014-11-19
    Changes: Database references
  • Version 1.3: 2023-06-14
    Changes: Data collection, Database references, Other