6N88

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


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 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:  
    6N89, 6N88

  • 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: mario.halic@stjude.org.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MGC52556 proteinA1038Xenopus laevisMutation(s): 0 
Gene Names: ipo7MGC52556ipo7.L
Find proteins for O42480 (Xenopus laevis)
Explore O42480 
Go to UniProtKB:  O42480
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Importin subunit beta-1B876Homo sapiensMutation(s): 0 
Gene Names: KPNB1NTF97
Find proteins for Q14974 (Homo sapiens)
Explore Q14974 
Go to UniProtKB:  Q14974
NIH Common Fund Data Resources
PHAROS  Q14974
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H1.0C194Homo sapiensMutation(s): 0 
Gene Names: H1F0H1FVH1-0
Find proteins for P07305 (Homo sapiens)
Explore P07305 
Go to UniProtKB:  P07305
NIH Common Fund Data Resources
PHAROS  P07305
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Research Council (ERC)European UnionERC-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
    Changes: Data collection, Database references
  • Version 1.2: 2019-04-03
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-18
    Changes: Author supporting evidence, Other