Crystal structure of MtISWI

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.196 

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This is version 1.2 of the entry. See complete history


Structure and regulation of the chromatin remodeller ISWI

Yan, L.Wang, L.Tian, Y.Xia, X.Chen, Z.

(2016) Nature 540: 466-469

  • DOI: https://doi.org/10.1038/nature20590
  • Primary Citation of Related Structures:  
    5JXR, 5JXT

  • PubMed Abstract: 

    ISWI is a member of the SWI2/SNF2 family of chromatin remodellers, which also includes Snf2, Chd1, and Ino80. ISWI is the catalytic subunit of several chromatin remodelling complexes, which mobilize nucleosomes along genomic DNA, promoting replication progression, transcription repression, heterochromatin formation, and many other nuclear processes. The ATPase motor of ISWI is an autonomous remodelling machine, whereas its carboxy (C)-terminal HAND-SAND-SLIDE (HSS) domain functions in binding extranucleosomal linker DNA. The activity of the catalytic core of ISWI is inhibited by the regulatory AutoN and NegC domains, which are in turn antagonized by the H4 tail and extranucleosomal DNA, respectively, to ensure the appropriate chromatin landscape in cells. How AutoN and NegC inhibit ISWI and regulate its nucleosome-centring activity remains elusive. Here we report the crystal structures of ISWI from the thermophilic yeast Myceliophthora thermophila and its complex with a histone H4 peptide. Our data show the amino (N)-terminal AutoN domain contains two inhibitory elements, which collectively bind the second RecA-like domain (core2), holding the enzyme in an inactive conformation. The H4 peptide binds to the core2 domain coincident with one of the AutoN-binding sites, explaining the ISWI activation by H4. The H4-binding surface is conserved in Snf2 and functions beyond AutoN regulation. The C-terminal NegC domain is involved in binding to the core2 domain and functions as an allosteric element for ISWI to respond to the extranucleosomal DNA length.

  • Organizational Affiliation

    MOE Key Laboratory of Protein Science, Tsinghua University, Beijing, 100084, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chromatin-remodeling complex ATPase-like protein
A, B
723Thermothelomyces thermophilus ATCC 42464Mutation(s): 0 
Gene Names: MYCTH_2307364
Find proteins for G2QFM3 (Thermothelomyces thermophilus (strain ATCC 42464 / BCRC 31852 / DSM 1799))
Explore G2QFM3 
Go to UniProtKB:  G2QFM3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupG2QFM3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.195 
  • R-Value Observed: 0.196 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 127.767α = 90
b = 127.767β = 90
c = 106.666γ = 120
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-12-07
    Type: Initial release
  • Version 1.1: 2017-01-25
    Changes: Database references
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references