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Basic information
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| Title | Cryo-EM structure of the human SAGA co-activator complex | |||||||||
Map data | Composite map of human SAGA | |||||||||
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Keywords | Transcription co-activator / Lysine acetyltransferase / complex / TRANSCRIPTION | |||||||||
| Function / homology | Function and homology informationSAGA-type complex / regulation of somatic stem cell population maintenance / SAGA complex assembly / lateral mesodermal cell differentiation / allantois development / transcription factor TFTC complex / SLIK (SAGA-like) complex / negative regulation of microtubule depolymerization / hepatocyte differentiation / Swr1 complex ...SAGA-type complex / regulation of somatic stem cell population maintenance / SAGA complex assembly / lateral mesodermal cell differentiation / allantois development / transcription factor TFTC complex / SLIK (SAGA-like) complex / negative regulation of microtubule depolymerization / hepatocyte differentiation / Swr1 complex / U12-type spliceosomal complex / RNA splicing, via transesterification reactions / maintenance of protein location in nucleus / splicing factor binding / regulation of double-strand break repair / U2-type precatalytic spliceosome / U2-type prespliceosome assembly / U2-type spliceosomal complex / RNA polymerase binding / SAGA complex / U2 snRNP / transcription preinitiation complex / precatalytic spliceosome / negative regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator / transcription factor TFIID complex / RNA polymerase II general transcription initiation factor activity / limb development / nucleus organization / HIV Transcription Initiation / RNA Polymerase II HIV Promoter Escape / Transcription of the HIV genome / RNA Polymerase II Promoter Escape / RNA Polymerase II Transcription Pre-Initiation And Promoter Opening / RNA Polymerase II Transcription Initiation / RNA Polymerase II Transcription Initiation And Promoter Clearance / regulation of RNA splicing / histone deacetylase complex / mRNA Splicing - Minor Pathway / DNA repair-dependent chromatin remodeling / NuA4 histone acetyltransferase complex / positive regulation of transcription initiation by RNA polymerase II / embryonic placenta development / U2 snRNA binding / somitogenesis / regulation of DNA repair / RNA polymerase II preinitiation complex assembly / positive regulation of double-strand break repair via homologous recombination / catalytic step 2 spliceosome / gastrulation / RNA Polymerase II Pre-transcription Events / mRNA Splicing - Major Pathway / visual perception / TBP-class protein binding / RNA splicing / nuclear estrogen receptor binding / male germ cell nucleus / spliceosomal complex / transcription coregulator activity / transcription initiation at RNA polymerase II promoter / DNA-templated transcription initiation / promoter-specific chromatin binding / G1/S transition of mitotic cell cycle / mRNA splicing, via spliceosome / Formation of the beta-catenin:TCF transactivating complex / negative regulation of protein catabolic process / mRNA transcription by RNA polymerase II / microtubule cytoskeleton organization / autophagy / multicellular organism growth / nuclear matrix / cytoplasmic ribonucleoprotein granule / transcription corepressor activity / nucleosome / HATs acetylate histones / microtubule cytoskeleton / positive regulation of cell growth / regulation of apoptotic process / transcription by RNA polymerase II / DNA-binding transcription factor binding / Regulation of TP53 Activity through Phosphorylation / transcription coactivator activity / regulation of cell cycle / Ub-specific processing proteases / nuclear speck / protein stabilization / chromatin remodeling / protein heterodimerization activity / focal adhesion / apoptotic process / regulation of transcription by RNA polymerase II / regulation of DNA-templated transcription / negative regulation of apoptotic process / positive regulation of DNA-templated transcription / protein-containing complex binding / nucleolus / perinuclear region of cytoplasm / enzyme binding / negative regulation of transcription by RNA polymerase II / Golgi apparatus / positive regulation of transcription by RNA polymerase II Similarity search - Function | |||||||||
| Biological species | Homo sapiens (human) | |||||||||
| Method | single particle reconstruction / cryo EM / Resolution: 2.41 Å | |||||||||
Authors | Damilot M / Ben-Shem A / Papai G | |||||||||
| Funding support | France, 2 items
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Citation | Journal: Sci Adv / Year: 2026Title: Insights into the structure and evolution of the human SAGA complex by affinity-ligand purification. Authors: Mylène Damilot / Thomas Schoeps / Laszlo Tora / Patrick Schultz / Luc Lebeau / Gabor Papai / Adam Ben-Shem / ![]() Abstract: Human SAGA is a 20-subunit transcriptional coactivator. Compared with yeast, metazoan SAGA uniquely incorporates a 150-kDa splicing-factor module (SPL), also present in U2 small nuclear ...Human SAGA is a 20-subunit transcriptional coactivator. Compared with yeast, metazoan SAGA uniquely incorporates a 150-kDa splicing-factor module (SPL), also present in U2 small nuclear ribonucleoprotein (U2snRNP). Metazoan gene duplication further specialized shared TFIID/SAGA subunits into SAGA-specific paralogs (TAF5L and TAF6L), but the functional consequences of this divergence are unknown. We report the structure of endogenous human SAGA purified via an affinity ligand from cells that were not disturbed by any genomic engineering tools. Our work reveals the high-resolution structure of SPL and the TAF6L HEAT repeat domain that provides the SPL with a docking surface. We elucidate how SPL and the HEAT repeats are incorporated into SAGA. We identify major structural differences between TAF6L/TAF5L and their canonical paralogs that enable SPL accommodation. SPL engages SAGA through a substantially smaller interface than in U2snRNP, despite sharing a deeply inserted helical motif. The seemingly weaker interaction of SPL with SAGA raises the possibility that SAGA relays this module to the splicing machinery. | |||||||||
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Structure visualization
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Downloads & links
-EMDB archive
| Map data | emd_53937.map.gz | 8.4 MB | EMDB map data format | |
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| Header (meta data) | emd-53937-v30.xml emd-53937.xml | 34.1 KB 34.1 KB | Display Display | EMDB header |
| Images | emd_53937.png | 69.7 KB | ||
| Filedesc metadata | emd-53937.cif.gz | 12.3 KB | ||
| Archive directory | http://ftp.pdbj.org/pub/emdb/structures/EMD-53937 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-53937 | HTTPS FTP |
-Related structure data
| Related structure data | ![]() 9rdkMC C: citing same article ( M: atomic model generated by this map |
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| Similar structure data | Similarity search - Function & homology F&H Search |
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Links
| EMDB pages | EMDB (EBI/PDBe) / EMDataResource |
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| Related items in Molecule of the Month |
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Map
| File | Download / File: emd_53937.map.gz / Format: CCP4 / Size: 259.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||
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| Annotation | Composite map of human SAGA | ||||||||||||||||||||||||||||||||||||
| Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
| Voxel size | X=Y=Z: 1 Å | ||||||||||||||||||||||||||||||||||||
| Density |
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| Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
| Details | EMDB XML:
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-Supplemental data
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Sample components
+Entire : SAGA
+Supramolecule #1: SAGA
+Macromolecule #1: Transcription initiation factor TFIID subunit 9B
+Macromolecule #2: Ataxin-7
+Macromolecule #3: TAF5-like RNA polymerase II p300/CBP-associated factor-associated...
+Macromolecule #4: Splicing factor 3B subunit 3
+Macromolecule #5: Transformation/transcription domain-associated protein
+Macromolecule #6: STAGA complex 65 subunit gamma
+Macromolecule #7: Transcription initiation factor TFIID subunit 12
+Macromolecule #8: Transcription initiation factor TFIID subunit 10
+Macromolecule #9: Transcription initiation protein SPT3 homolog
+Macromolecule #10: Transcriptional adapter 1
+Macromolecule #11: TAF6-like RNA polymerase II p300/CBP-associated factor-associated...
+Macromolecule #12: Transcription factor SPT20 homolog
+Macromolecule #13: Splicing factor 3B subunit 5
-Experimental details
-Structure determination
| Method | cryo EM |
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Processing | single particle reconstruction |
| Aggregation state | particle |
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Sample preparation
| Concentration | 0.15 mg/mL |
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| Buffer | pH: 8 |
| Vitrification | Cryogen name: ETHANE |
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Electron microscopy
| Microscope | TFS KRIOS |
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| Image recording | Film or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 40.0 e/Å2 |
| Electron beam | Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN |
| Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 3.5 µm / Nominal defocus min: 1.2 µm |
| Sample stage | Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN |
| Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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About Yorodumi




Keywords
Homo sapiens (human)
Authors
France, 2 items
Citation












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Processing
FIELD EMISSION GUN
