6N88

Cryo-EM structure of the Importin7:Importin beta:Histone H1.0 complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.2 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Fuzzy Interactions Form and Shape the Histone Transport Complex.

Ivic, N.Potocnjak, M.Solis-Mezarino, V.Herzog, F.Bilokapic, S.Halic, M.

(2019) Mol. Cell 73: 1191

  • DOI: 10.1016/j.molcel.2019.01.032
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Protein transport into the nucleus is mediated by transport receptors. Import of highly charged proteins, such as histone H1 and ribosomal proteins, requires a dimer of two transport receptors. In this study, we determined the cryo-EM structure of th ...

    Protein transport into the nucleus is mediated by transport receptors. Import of highly charged proteins, such as histone H1 and ribosomal proteins, requires a dimer of two transport receptors. In this study, we determined the cryo-EM structure of the Imp7:Impβ:H1.0 complex, showing that the two importins form a cradle that accommodates the linker histone. The H1.0 globular domain is bound to Impβ, whereas the acidic loops of Impβ and Imp7 chaperone the positively charged C-terminal tail. Although it remains disordered, the H1 tail serves as a zipper that closes and stabilizes the structure through transient non-specific interactions with importins. Moreover, we found that the GGxxF and FxFG motifs in the Imp7 C-terminal tail are essential for Imp7:Impβ dimerization and H1 import, resembling importin interaction with nucleoporins, which, in turn, promote complex disassembly. The architecture of many other complexes might be similarly defined by rapidly exchanging electrostatic interactions mediated by disordered regions.


    Organizational Affiliation

    Gene Center Munich and Department of Biochemistry, Ludwig Maximilian University of Munich, 81377 Munich, Germany; Department of Structural Biology, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA. Electronic address: silvija.bilokapic@stjude.org.,Gene Center Munich and Department of Biochemistry, Ludwig Maximilian University of Munich, 81377 Munich, Germany; Department of Physical Chemistry, Rudjer Boskovic Institute, 10000 Zagreb, Croatia.,Gene Center Munich and Department of Biochemistry, Ludwig Maximilian University of Munich, 81377 Munich, Germany.,Gene Center Munich and Department of Biochemistry, Ludwig Maximilian University of Munich, 81377 Munich, Germany; Department of Structural Biology, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN 38105, USA. Electronic address: mario.halic@stjude.org.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MGC52556 protein
A
1038Xenopus laevisMutation(s): 0 
Gene Names: ipo7 (MGC52556)
Find proteins for O42480 (Xenopus laevis)
Go to UniProtKB:  O42480
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Importin subunit beta-1
B
876Homo sapiensMutation(s): 0 
Gene Names: KPNB1 (NTF97)
Find proteins for Q14974 (Homo sapiens)
Go to Gene View: KPNB1
Go to UniProtKB:  Q14974
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Histone H1.0
C
194Homo sapiensMutation(s): 0 
Gene Names: H1F0 (H1FV)
Find proteins for P07305 (Homo sapiens)
Go to Gene View: H1F0
Go to UniProtKB:  P07305
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.2 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research CouncilGermanyERC-smallRNAhet-309584
European Communitys Seventh Framework ProgrammeCroatiaNEWFELPRO_26

Revision History 

  • Version 1.0: 2019-02-27
    Type: Initial release
  • Version 1.1: 2019-03-13
    Type: Data collection, Database references
  • Version 1.2: 2019-04-03
    Type: Data collection, Database references