7UMI

Importin a1 bound to Cp183-CTD


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.99 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural basis for nuclear import of hepatitis B virus (HBV) nucleocapsid core.

Yang, R.Ko, Y.H.Li, F.Lokareddy, R.K.Hou, C.D.Kim, C.Klein, S.Antolinez, S.Marin, J.F.Perez-Segura, C.Jarrold, M.F.Zlotnick, A.Hadden-Perilla, J.A.Cingolani, G.

(2024) Sci Adv 10: eadi7606-eadi7606

  • DOI: https://doi.org/10.1126/sciadv.adi7606
  • Primary Citation of Related Structures:  
    7UMI, 8G5V, 8G6V, 8G8Y, 8GCN

  • PubMed Abstract: 

    Nuclear import of the hepatitis B virus (HBV) nucleocapsid is essential for replication that occurs in the nucleus. The ~360-angstrom HBV capsid translocates to the nuclear pore complex (NPC) as an intact particle, hijacking human importins in a reaction stimulated by host kinases. This paper describes the mechanisms of HBV capsid recognition by importins. We found that importin α1 binds a nuclear localization signal (NLS) at the far end of the HBV coat protein Cp183 carboxyl-terminal domain (CTD). This NLS is exposed to the capsid surface through a pore at the icosahedral quasi-sixfold vertex. Phosphorylation at serine-155, serine-162, and serine-170 promotes CTD compaction but does not affect the affinity for importin α1. The binding of 30 importin α1/β1 augments HBV capsid diameter to ~620 angstroms, close to the maximum size trafficable through the NPC. We propose that phosphorylation favors CTD externalization and prompts its compaction at the capsid surface, exposing the NLS to importins.


  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Thomas Jefferson University, 1020 Locust Street, Philadelphia, PA 19107, USA.


Macromolecules

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
HBV-NLS10Hepatitis B virusMutation(s): 0 
UniProt
Find proteins for P03147 (Hepatitis B virus genotype D subtype adw (isolate United Kingdom/adyw/1979))
Explore P03147 
Go to UniProtKB:  P03147
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03147
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Importin subunit alpha-1B [auth E]467Mus musculusMutation(s): 0 
Gene Names: Kpna2Rch1
UniProt & NIH Common Fund Data Resources
Find proteins for P52293 (Mus musculus)
Explore P52293 
Go to UniProtKB:  P52293
IMPC:  MGI:103561
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP52293
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.99 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.184 
  • R-Value Observed: 0.185 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.436α = 90
b = 90.688β = 90
c = 97.198γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States5R01GM122844-04

Revision History  (Full details and data files)

  • Version 1.0: 2023-10-25
    Type: Initial release
  • Version 1.1: 2024-02-28
    Changes: Database references