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- EMDB-61624: Structure of isw1-nucleosome complex in ATP state -

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Entry
Database: EMDB / ID: EMD-61624
TitleStructure of isw1-nucleosome complex in ATP state
Map data
Sample
  • Complex: Structure of isw1-nucleosome complex in ATP state
    • Protein or peptide: Histone H3
    • Protein or peptide: Histone H4
    • Protein or peptide: Histone H2A
    • Protein or peptide: Histone H2B
    • DNA: DNA (146-MER)
    • DNA: DNA (146-MER)
    • Protein or peptide: ISWI chromatin-remodeling complex ATPase ISW1
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION
KeywordsChromatin Remodeler / Nucleosome / DNA BINDING PROTEIN/DNA / DNA BINDING PROTEIN-DNA complex
Function / homology
Function and homology information


Isw1b complex / Isw1a complex / Isw1 complex / regulation of transcriptional start site selection at RNA polymerase II promoter / nucleolar chromatin / negative regulation of RNA export from nucleus / negative regulation of IRE1-mediated unfolded protein response / DNA-templated transcription elongation / regulation of chromatin organization / rDNA binding ...Isw1b complex / Isw1a complex / Isw1 complex / regulation of transcriptional start site selection at RNA polymerase II promoter / nucleolar chromatin / negative regulation of RNA export from nucleus / negative regulation of IRE1-mediated unfolded protein response / DNA-templated transcription elongation / regulation of chromatin organization / rDNA binding / nucleosome array spacer activity / sister chromatid cohesion / termination of RNA polymerase II transcription / termination of RNA polymerase I transcription / nucleosome binding / mRNA 3'-UTR binding / helicase activity / Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement / structural constituent of chromatin / nucleosome / heterochromatin formation / nucleosome assembly / response to heat / hydrolase activity / transcription cis-regulatory region binding / chromatin remodeling / protein heterodimerization activity / chromatin binding / regulation of DNA-templated transcription / chromatin / positive regulation of transcription by RNA polymerase II / DNA binding / ATP binding / nucleus
Similarity search - Function
Isw1/2, N-terminal / ISWI, HAND domain / SLIDE domain / ISWI, HAND domain superfamily / HAND / SLIDE / SANT domain profile. / SANT domain / : / SNF2-like, N-terminal domain superfamily ...Isw1/2, N-terminal / ISWI, HAND domain / SLIDE domain / ISWI, HAND domain superfamily / HAND / SLIDE / SANT domain profile. / SANT domain / : / SNF2-like, N-terminal domain superfamily / SNF2, N-terminal / SNF2-related domain / SANT SWI3, ADA2, N-CoR and TFIIIB'' DNA-binding domains / SANT/Myb domain / : / Histone H2B signature. / Histone H2A conserved site / Histone H2A signature. / Histone H2B / Histone H2B / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone 2A / Histone H2A / TATA box binding protein associated factor / TATA box binding protein associated factor (TAF), histone-like fold domain / Histone H4, conserved site / Histone H4 signature. / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / Homeobox-like domain superfamily / Helicase conserved C-terminal domain / Histone H3 signature 1. / Histone H3 signature 2. / Histone H3 / Histone H3/CENP-A / Histone H2A/H2B/H3 / Core histone H2A/H2B/H3/H4 domain / Histone-fold / helicase superfamily c-terminal domain / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / DEAD-like helicases superfamily / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Histone H3 / Histone H2B / Histone H4 / ISWI chromatin-remodeling complex ATPase ISW1 / Histone H2A
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast) / Xenopus laevis (African clawed frog) / Saccharomyces cerevisiae S288C (yeast) / Escherichia coli K-12 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.3 Å
AuthorsSia Y / Pan H / Chen Z
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Science / Year: 2025
Title: Structural insights into chromatin remodeling by ISWI during active ATP hydrolysis.
Authors: Youyang Sia / Han Pan / Kangjing Chen / Zhucheng Chen /
Abstract: Chromatin remodelers utilize the energy of adenosine triphosphate (ATP) hydrolysis to slide nucleosomes, regulating chromatin structure and gene activity in cells. In this work, we report structures ...Chromatin remodelers utilize the energy of adenosine triphosphate (ATP) hydrolysis to slide nucleosomes, regulating chromatin structure and gene activity in cells. In this work, we report structures of imitation switch (ISWI) bound to the nucleosome during active ATP hydrolysis and remodeling, revealing conformational transitions of the remodeling motor across the adenosine triphosphatase (ATPase) cycle. The DNA strands were distorted accordingly, showing one full base-pair bulge and a loss of histone contact at the site of motor binding in the adenosine diphosphate* (ADP*) and apo* (unbound) states. We also identified several important elements for regulation of the remodeling activity. Notably, an enzyme conformation exiting the remodeling cycle reveals a linker DNA-sensing brake mechanism. Together, our findings elucidate a multistate model of ISWI action, providing a comprehensive mechanism of DNA translocation and regulation underpinning chromatin remodeling.
History
DepositionSep 23, 2024-
Header (metadata) releaseApr 9, 2025-
Map releaseApr 9, 2025-
UpdateJun 18, 2025-
Current statusJun 18, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_61624.png

Downloads & links

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Map

FileDownload / File: emd_61624.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 320 pix.
= 346.4 Å		1.08 Å/pix.
x 320 pix.
= 346.4 Å		1.08 Å/pix.
x 320 pix.
= 346.4 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.0825 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.09
Minimum - Maximum-0.12438947 - 0.444212
Average (Standard dev.)0.00026369866 (±0.008952361)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 346.4 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_61624_msk_1.map
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AxesZYX

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Density Histograms

Histogram

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Half map: #2

Fileemd_61624_half_map_1.map
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Histogram

Histogram (log scale)

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Half map: #1

Fileemd_61624_half_map_2.map
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Sample components

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Entire : Structure of isw1-nucleosome complex in ATP state

EntireName: Structure of isw1-nucleosome complex in ATP state
Components
  • Complex: Structure of isw1-nucleosome complex in ATP state
    • Protein or peptide: Histone H3
    • Protein or peptide: Histone H4
    • Protein or peptide: Histone H2A
    • Protein or peptide: Histone H2B
    • DNA: DNA (146-MER)
    • DNA: DNA (146-MER)
    • Protein or peptide: ISWI chromatin-remodeling complex ATPase ISW1
  • Ligand: ADENOSINE-5'-TRIPHOSPHATE
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Structure of isw1-nucleosome complex in ATP state

SupramoleculeName: Structure of isw1-nucleosome complex in ATP state / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#7
Source (natural)Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (yeast)

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Macromolecule #1: Histone H3

MacromoleculeName: Histone H3 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 15.30393 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
ARTKQTARKS TGGKAPRKQL ATKAARKSAP ATGGVKKPHR YRPGTVALRE IRRYQKSTEL LIRKLPFQRL VREIAQDFKT DLRFQSSAV MALQEASEAY LVALFEDTNL CAIHAKRVTI MPKDIQLARR IRGERA

UniProtKB: Histone H3

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Macromolecule #2: Histone H4

MacromoleculeName: Histone H4 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 11.263231 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
SGRGKGGKGL GKGGAKRHRK VLRDNIQGIT KPAIRRLARR GGVKRISGLI YEETRGVLKV FLENVIRDAV TYTEHAKRKT VTAMDVVYA LKRQGRTLYG FGG

UniProtKB: Histone H4

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Macromolecule #3: Histone H2A

MacromoleculeName: Histone H2A / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 13.978241 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
SGRGKQGGKT RAKAKTRSSR AGLQFPVGRV HRLLRKGNYA ERVGAGAPVY LAAVLEYLTA EILELAGNAA RDNKKTRIIP RHLQLAVRN DEELNKLLGR VTIAQGGVLP NIQSVLLPKK TESSKSAKSK

UniProtKB: Histone H2A

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Macromolecule #4: Histone H2B

MacromoleculeName: Histone H2B / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 13.524752 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
AKSAPAPKKG SKKAVTKTQK KDGKKRRKTR KESYAIYVYK VLKQVHPDTG ISSKAMSIMN SFVNDVFERI AGEASRLAHY NKRSTITSR EIQTAVRLLL PGELAKHAVS EGTKAVTKYT SAK

UniProtKB: Histone H2B

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Macromolecule #7: ISWI chromatin-remodeling complex ATPase ISW1

MacromoleculeName: ISWI chromatin-remodeling complex ATPase ISW1 / type: protein_or_peptide / ID: 7 / Number of copies: 1 / Enantiomer: LEVO
EC number: Hydrolases; Acting on acid anhydrides; Acting on acid anhydrides to facilitate cellular and subcellular movement
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
Molecular weightTheoretical: 123.170516 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: ENLKPFQVGL PPHDPESNKK RYLLKDANGK KFDLEGTTKR FEHLLSLSGL FKHFIESKAA KDPKFRQVLD VLEENKANGK GKGKHQDVR RRKTEHEEDA ELLKEEDSDD DESIEFQFRE SPAYVNGQLR PYQIQGVNWL VSLHKNKIAG ILADEMGLGK T LQTISFLG ...String:
ENLKPFQVGL PPHDPESNKK RYLLKDANGK KFDLEGTTKR FEHLLSLSGL FKHFIESKAA KDPKFRQVLD VLEENKANGK GKGKHQDVR RRKTEHEEDA ELLKEEDSDD DESIEFQFRE SPAYVNGQLR PYQIQGVNWL VSLHKNKIAG ILADEMGLGK T LQTISFLG YLRYIEKIPG PFLVIAPKST LNNWLREINR WTPDVNAFIL QGDKEERAEL IQKKLLGCDF DVVIASYEII IR EKSPLKK INWEYIIIDE AHRIKNEESM LSQVLREFTS RNRLLITGTP LQNNLHELWA LLNFLLPDIF SDAQDFDDWF SSE STEEDQ DKIVKQLHTV LQPFLLRRIK SDVETSLLPK KELNLYVGMS SMQKKWYKKI LEKDLDAVNG SNGSKESKTR LLNI MMQLR KCCNHPYLFD GAEPGPPYTT DEHLVYNAAK LQVLDKLLKK LKEEGSRVLI FSQMSRLLDI LEDYCYFRNY EYCRI DGST AHEDRIQAID DYNAPDSKKF VFLLTTRAGG LGINLTSADV VVLYDSDWNP QADLQAMDRA HRIGQKKQVK VFRLVT DNS VEEKILERAT QKLRLDQLVI QQNRTSLKKK ENKADSKDAL LSMIQHGAAD VFKSGTSTGS AGTPEPGSGE KGDDIDL DE LLLKSENKTK SLNAKYETLG LDDLQKFNQD SAYEWNGQDF KKKIQRDIIS PLLLNPTKRE RKENYSIDNY YKDVLNTG R SSTPSHPRMP KPHVFHSHQL QPPQLKVLYE KERMWTAKKT GYVPTMDDVK AAYGDISDEE EKKQKLELLK LSVNNSQPL TEEEEKMKAD WESEGFTNWN KLEFRKFITV SGKYGRNSIQ AIARELAPGK TLEEVRAYAK AFWSNIERIE DYEKYLKIIE NEEEKIKRV KMQQEALRRK LSEYKNPFFD LKLKHPPSSN NKRTYSEEED RFILLMLFKY GLDRDDVYEL VRDEIRDCPL F ELDFYFRS RTPVELARRG NTLLQCLEKE FNAGIVLDDA TKDRMKKEDE NGKRIREEFA DQTANEKENV DGVESKKAKI ED TSNVGTE QLVAEKIPEN ETTH

UniProtKB: ISWI chromatin-remodeling complex ATPase ISW1

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Macromolecule #5: DNA (146-MER)

MacromoleculeName: DNA (146-MER) / type: dna / ID: 5 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 44.825559 KDa
SequenceString: (DT)(DC)(DG)(DA)(DG)(DA)(DA)(DT)(DC)(DC) (DC)(DG)(DG)(DT)(DG)(DC)(DC)(DG)(DA)(DG) (DG)(DC)(DC)(DG)(DC)(DT)(DC)(DA)(DA) (DT)(DT)(DG)(DG)(DT)(DC)(DG)(DT)(DA)(DG) (DA) (DC)(DA)(DG)(DC)(DT)(DC) ...String:
(DT)(DC)(DG)(DA)(DG)(DA)(DA)(DT)(DC)(DC) (DC)(DG)(DG)(DT)(DG)(DC)(DC)(DG)(DA)(DG) (DG)(DC)(DC)(DG)(DC)(DT)(DC)(DA)(DA) (DT)(DT)(DG)(DG)(DT)(DC)(DG)(DT)(DA)(DG) (DA) (DC)(DA)(DG)(DC)(DT)(DC)(DT)(DA) (DG)(DC)(DA)(DC)(DC)(DG)(DC)(DT)(DT)(DA) (DA)(DA) (DC)(DG)(DC)(DA)(DC)(DG)(DT) (DA)(DC)(DG)(DC)(DG)(DC)(DT)(DG)(DT)(DC) (DC)(DC)(DC) (DC)(DG)(DC)(DG)(DT)(DT) (DT)(DT)(DA)(DA)(DC)(DC)(DG)(DC)(DC)(DA) (DA)(DG)(DG)(DG) (DG)(DA)(DT)(DT)(DA) (DC)(DT)(DC)(DC)(DC)(DT)(DA)(DG)(DT)(DC) (DT)(DC)(DC)(DA)(DG) (DG)(DC)(DA)(DC) (DG)(DT)(DG)(DT)(DC)(DA)(DG)(DA)(DT)(DA) (DT)(DA)(DT)(DA)(DC)(DA) (DT)(DC)(DC) (DG)(DA)(DT)

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Macromolecule #6: DNA (146-MER)

MacromoleculeName: DNA (146-MER) / type: dna / ID: 6 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: Escherichia coli K-12 (bacteria)
Molecular weightTheoretical: 45.305852 KDa
SequenceString: (DA)(DT)(DC)(DG)(DG)(DA)(DT)(DG)(DT)(DA) (DT)(DA)(DT)(DA)(DT)(DC)(DT)(DG)(DA)(DC) (DA)(DC)(DG)(DT)(DG)(DC)(DC)(DT)(DG) (DG)(DA)(DG)(DA)(DC)(DT)(DA)(DG)(DG)(DG) (DA) (DG)(DT)(DA)(DA)(DT)(DC) ...String:
(DA)(DT)(DC)(DG)(DG)(DA)(DT)(DG)(DT)(DA) (DT)(DA)(DT)(DA)(DT)(DC)(DT)(DG)(DA)(DC) (DA)(DC)(DG)(DT)(DG)(DC)(DC)(DT)(DG) (DG)(DA)(DG)(DA)(DC)(DT)(DA)(DG)(DG)(DG) (DA) (DG)(DT)(DA)(DA)(DT)(DC)(DC)(DC) (DC)(DT)(DT)(DG)(DG)(DC)(DG)(DG)(DT)(DT) (DA)(DA) (DA)(DA)(DC)(DG)(DC)(DG)(DG) (DG)(DG)(DG)(DA)(DC)(DA)(DG)(DC)(DG)(DC) (DG)(DT)(DA) (DC)(DG)(DT)(DG)(DC)(DG) (DT)(DT)(DT)(DA)(DA)(DG)(DC)(DG)(DG)(DT) (DG)(DC)(DT)(DA) (DG)(DA)(DG)(DC)(DT) (DG)(DT)(DC)(DT)(DA)(DC)(DG)(DA)(DC)(DC) (DA)(DA)(DT)(DT)(DG) (DA)(DG)(DC)(DG) (DG)(DC)(DC)(DT)(DC)(DG)(DG)(DC)(DA)(DC) (DC)(DG)(DG)(DG)(DA)(DT) (DT)(DC)(DT) (DC)(DG)(DA)

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Macromolecule #8: ADENOSINE-5'-TRIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-TRIPHOSPHATE / type: ligand / ID: 8 / Number of copies: 1 / Formula: ATP
Molecular weightTheoretical: 507.181 Da
Chemical component information

ChemComp-ATP:
ADENOSINE-5'-TRIPHOSPHATE / ATP, energy-carrying molecule*YM

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Macromolecule #9: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 9 / Number of copies: 1 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 8.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.8 µm / Nominal defocus min: 1.4000000000000001 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: NONE
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.3 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 1080568
Initial angle assignmentType: OTHER
Final angle assignmentType: OTHER
FSC plot (resolution estimation)

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