6UPL

Structure of FACT_subnucleosome complex 2

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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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:  
    6UPK, 6UPL

  • 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 both disassembly and reassembly of nucleosomes during gene transcription, DNA replication and DNA repair 2 ...

    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 H3.1A, E136Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P68431 (Homo sapiens)
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PHAROS:  P68431
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UniProt GroupP68431
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H4B, F103Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P62805 (Homo sapiens)
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2AC,
G [auth K]		130Homo sapiensMutation(s): 0 
Gene Names: HIST1H2AC, H2AFL, H2AC6
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Histone H2BD,
H [auth L]		126Homo sapiensMutation(s): 0 
Gene Names: 
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Find proteins for P62807 (Homo sapiens)
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
FACT complex subunit SPT16I [auth G]966Homo sapiensMutation(s): 0 
Gene Names: SUPT16H, FACT140, FACTP140
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
FACT complex subunit SSRP1J [auth H]640Homo sapiensMutation(s): 0 
Gene Names: SSRP1, FACT80
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Entity ID: 7
MoleculeChainsLengthOrganismImage
DNA (79-mer)K [auth I]79Escherichia coli
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Entity ID: 8
MoleculeChainsLengthOrganismImage
DNA (79-mer)L [auth J]79Escherichia coli
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 7.40 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  (Full details and data files)

  • Version 1.0: 2019-12-11
    Type: Initial release
  • Version 1.1: 2020-01-15
    Changes: Author supporting evidence
  • Version 1.2: 2020-01-29
    Changes: Database references