National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM095822
United States
Citation
Journal: Cell / Year: 2019 Title: Mechanism of Cross-talk between H2B Ubiquitination and H3 Methylation by Dot1L. Authors: Evan J Worden / Niklas A Hoffmann / Chad W Hicks / Cynthia Wolberger / Abstract: Methylation of histone H3 K79 by Dot1L is a hallmark of actively transcribed genes that depends on monoubiquitination of H2B K120 (H2B-Ub) and is an example of histone modification cross-talk that is ...Methylation of histone H3 K79 by Dot1L is a hallmark of actively transcribed genes that depends on monoubiquitination of H2B K120 (H2B-Ub) and is an example of histone modification cross-talk that is conserved from yeast to humans. We report here cryo-EM structures of Dot1L bound to ubiquitinated nucleosome that show how H2B-Ub stimulates Dot1L activity and reveal a role for the histone H4 tail in positioning Dot1L. We find that contacts mediated by Dot1L and the H4 tail induce a conformational change in the globular core of histone H3 that reorients K79 from an inaccessible position, thus enabling this side chain to insert into the active site in a position primed for catalysis. Our study provides a comprehensive mechanism of cross-talk between histone ubiquitination and methylation and reveals structural plasticity in histones that makes it possible for histone-modifying enzymes to access residues within the nucleosome core.
History
Deposition
Jan 16, 2019
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Header (metadata) release
Feb 6, 2019
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Map release
Feb 20, 2019
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Update
Mar 20, 2024
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Current status
Mar 20, 2024
Processing site: RCSB / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Entire : Poised state Dot1L in complex with the H2B-Ub nucleosome
Entire
Name: Poised state Dot1L in complex with the H2B-Ub nucleosome
Components
Complex: Poised state Dot1L in complex with the H2B-Ub nucleosome
Complex: Dot1L
Protein or peptide: Histone-lysine N-methyltransferase, H3 lysine-79 specific
Complex: H2B-Ub nucleosome
Complex: histone core
Protein or peptide: Histone H3.2
Protein or peptide: Histone H4
Protein or peptide: Histone H2A type 1
Protein or peptide: Histone H2B 1.1
Complex: ubiquitin
Protein or peptide: Ubiquitin
Complex: DNA
DNA: 601 DNA Strand 1
DNA: 601 DNA Strand 2
+
Supramolecule #1: Poised state Dot1L in complex with the H2B-Ub nucleosome
Supramolecule
Name: Poised state Dot1L in complex with the H2B-Ub nucleosome type: complex / ID: 1 / Parent: 0 / Macromolecule list: all / Details: 1:1 complex of Dot1L bound to the nucleosome
Details: Solutions were prepared on the day of freezing and filtered though a 0.2 um filter prior to use.
Grid
Model: C-flat-2/2 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY ARRAY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 30 sec. / Pretreatment - Atmosphere: AIR
Vitrification
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV / Details: Blot once for 3.5 seconds before freezing.
Details
Crosslinked with glutaraldehyde
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Electron microscopy
Microscope
FEI TITAN KRIOS
Image recording
Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Digitization - Frames/image: 1-40 / Number grids imaged: 1 / Number real images: 2267 / Average exposure time: 9.0 sec. / Average electron dose: 50.0 e/Å2 / Details: 3 exposures per hole
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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