6UPK

Structure of FACT_subnucleosome complex 1


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.90 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

FACT caught in the act of manipulating the nucleosome.

Liu, Y.Zhou, K.Zhang, N.Wei, H.Tan, Y.Z.Zhang, Z.Carragher, B.Potter, C.S.D'Arcy, S.Luger, K.

(2020) Nature 577: 426-431

  • DOI: 10.1038/s41586-019-1820-0
  • Primary Citation of Related Structures:  
    6UPL, 6UPK

  • PubMed Abstract: 
  • The organization of genomic DNA into nucleosomes profoundly affects all DNA-related processes in eukaryotes. The histone chaperone known as 'facilitates chromatin transcription' (FACT 1 ) (consisting of subunits SPT16 and SSRP1) promotes b ...

    The organization of genomic DNA into nucleosomes profoundly affects all DNA-related processes in eukaryotes. The histone chaperone known as 'facilitates chromatin transcription' (FACT 1 ) (consisting of subunits SPT16 and SSRP1) promotes both disassembly and reassembly of nucleosomes during gene transcription, DNA replication and DNA repair 2 . However, the mechanism by which FACT causes these opposing outcomes is unknown. Here we report two cryo-electron-microscopic structures of human FACT in complex with partially assembled subnucleosomes, with supporting biochemical and hydrogen-deuterium exchange data. We find that FACT is engaged in extensive interactions with nucleosomal DNA and all histone variants. The large DNA-binding surface on FACT appears to be protected by the carboxy-terminal domains of both of its subunits, and this inhibition is released by interaction with H2A-H2B, allowing FACT-H2A-H2B to dock onto a complex containing DNA and histones H3 and H4 (ref. 3 ). SPT16 binds nucleosomal DNA and tethers H2A-H2B through its carboxy-terminal domain by acting as a placeholder for DNA. SSRP1 also contributes to DNA binding, and can assume two conformations, depending on whether a second H2A-H2B dimer is present. Our data suggest a compelling mechanism for how FACT maintains chromatin integrity during polymerase passage, by facilitating removal of the H2A-H2B dimer, stabilizing intermediate subnucleosomal states and promoting nucleosome reassembly. Our findings reconcile discrepancies regarding the many roles of FACT and underscore the dynamic interactions between histone chaperones and nucleosomes.


    Organizational Affiliation

    Howard Hughes Medical Institute, Chevy Chase, MD, USA. karolin.luger@colorado.edu.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H3.1AE136Homo sapiensMutation(s): 0 
Gene Names: 
Find proteins for P68431 (Homo sapiens)
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PHAROS  P68431
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4BF103Homo sapiensMutation(s): 0 
Gene Names: 
Find proteins for P62805 (Homo sapiens)
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PHAROS  P62805
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2AC130Homo sapiensMutation(s): 0 
Gene Names: HIST1H2ACH2AFLH2AC6
Find proteins for Q93077 (Homo sapiens)
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PHAROS  Q93077
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2BD126Homo sapiensMutation(s): 0 
Gene Names: 
Find proteins for P62807 (Homo sapiens)
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PHAROS  P62807
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  • Reference Sequence
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
FACT complex subunit SPT16G966Homo sapiensMutation(s): 0 
Gene Names: SUPT16HFACT140FACTP140
Find proteins for Q9Y5B9 (Homo sapiens)
Explore Q9Y5B9 
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PHAROS  Q9Y5B9
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
FACT complex subunit SSRP1H640Homo sapiensMutation(s): 0 
Gene Names: SSRP1FACT80
Find proteins for Q08945 (Homo sapiens)
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PHAROS  Q08945
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  • Reference Sequence
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Entity ID: 7
MoleculeChainsLengthOrganismImage
DNA (79-mer)I79Escherichia coli
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Entity ID: 8
MoleculeChainsLengthOrganismImage
DNA (79-mer)J79Escherichia coli
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Howard Hughes Medical Institute (HHMI)United States--

Revision History 

  • Version 1.0: 2019-12-11
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Author supporting evidence
  • Version 1.2: 2020-01-29
    Changes: Database references