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- EMDB-73240: Focused map of Tra1 module of ctSAGA complex -

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Basic information

Entry
Database: EMDB / ID: EMD-73240
TitleFocused map of Tra1 module of ctSAGA complex
Map data
Sample
  • Complex: Tra1 module of ctSAGA complex
KeywordsctSAGA complex / Histone Acetyl Transferase (HAT) Module / Tra1 module and Core module / TRANSCRIPTION
Biological speciesThermochaetoides thermophila (fungus)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.0 Å
AuthorsMattoo RUH / Chen DH / Bushnell DA / Tamir S / Kornberg RD
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM049985 United States
CitationJournal: Mol Cell / Year: 2025
Title: Structure of the transcriptional co-activator SAGA complex, including the histone acetyltransferase module.
Authors: Rayees U H Mattoo / Dong-Hua Chen / David A Bushnell / Sagi Tamir / Roger D Kornberg /
Abstract: The Spt-Ada-Gcn5 acetyltransferase (SAGA) complex, a 1.8 MDa multi-subunit assembly comprising 19 subunits, is required for RNA polymerase II transcription in eukaryotes. The complex consists of four ...The Spt-Ada-Gcn5 acetyltransferase (SAGA) complex, a 1.8 MDa multi-subunit assembly comprising 19 subunits, is required for RNA polymerase II transcription in eukaryotes. The complex consists of four modules: transcription-associated protein 1 (Tra1), core, deubiquitination (DUB), and histone acetyltransferase (HAT). Although the structures of the Tra1, core, and DUB modules have been determined, the overall architecture of the HAT module remained elusive due to its inherent flexibility. To address this, we conducted cryo-electron microscopy (cryo-EM) analyses on SAGA purified from the thermophilic fungus Chaetomium thermophilum, yielding structures of Tra1 and core modules at 2.6 Å and three of the four HAT subunits at 3.7 Å. The structure of the HAT module was informative about the aspects of histone acetylation and the interface of HAT-core modules, contradicting earlier AlphaFold predictions. Our structure-guided genetic and biochemical analyses confirmed the roles of Ada1 and Spt7 in anchoring the HAT module within the SAGA complex.
History
DepositionOct 12, 2025-
Header (metadata) releaseDec 3, 2025-
Map releaseDec 3, 2025-
UpdateDec 17, 2025-
Current statusDec 17, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_73240.png

Downloads & links

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Map

FileDownload / File: emd_73240.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.04 Å/pix.
x 360 pix.
= 374.76 Å		1.04 Å/pix.
x 360 pix.
= 374.76 Å		1.04 Å/pix.
x 360 pix.
= 374.76 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.041 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.02
Minimum - Maximum-0.07264396 - 0.14785701
Average (Standard dev.)-0.000003731161 (±0.0049236696)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 374.76 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_73240_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_73240_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Tra1 module of ctSAGA complex

EntireName: Tra1 module of ctSAGA complex
Components
  • Complex: Tra1 module of ctSAGA complex

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Supramolecule #1: Tra1 module of ctSAGA complex

SupramoleculeName: Tra1 module of ctSAGA complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Thermochaetoides thermophila (fungus)

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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: 7.5
Sugar embeddingMaterial: HEPES Buffer
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 68.9 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: OTHER / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.2 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: CTFFIND / Type: NONE
Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION / Number images used: 1886619
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: PROJECTION MATCHING

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