SAGA (Spt–Ada–Gcn5–acetyltransferase) is a 19-subunit complex that stimulates transcription via two chromatin-modifying enzymatic modules and by delivering the TATA box binding protein (TBP) to nucleate the pre-initiation complex on DNA, a pivotal event in the expression of protein-encoding genes1. Here we present the structure of yeast SAGA with bound TBP. The core of the complex is resolved at 3.5 Å resolution (0.143 Fourier shell correlation). The structure reveals the intricate network of interactions that coordinate the different functional domains of SAGA and resolves an octamer of histone-fold domains at the core of SAGA. This deformed octamer deviates considerably from the symmetrical analogue in the nucleosome and is precisely tuned to establish a peripheral site for TBP, where steric hindrance represses binding of spurious DNA. Complementary biochemical analysis points to a mechanism for TBP delivery and release from SAGA that requires transcription factor IIA and whose efficiency correlates with the affinity of DNA to TBP. We provide the foundations for understanding the specific delivery of TBP to gene promoters and the multiple roles of SAGA in regulating gene expression.
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The cryo-EM maps have been deposited in the Electron Microscopy Data Bank (EMDB) under accession codes EMD-10438 (SAGA–TBP), EMD-10440 (SAGA–TBP, refined for Tra1 lobe), EMD-10441 (SAGA–TBP, refined for main lobe), EMD-10446 (SAGA–TBP, low-pass-filtered), EMD-10448 (SAGA–TBP, focused classification on TBP), EMD-10447 (SAGA without TBP). The model coordinates for SAGA–TBP were deposited in the Protein Data Bank (PDB) under the accession codes 6TB4 and 6TBM (including Spt8 and DUB).
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We thank D. Devys and L. Tora for carefully reading the manuscript and for advice; R. Wagner and B. Séraphin for advice during the initial stages of this project; and R. Ben-Shem for graphics expertise. We acknowledge support from the Institut National de la Santé et de la Recherche Médicale (INSERM), the Centre National pour la Recherche Scientifique (CNRS), the Association pour la Recherche sur le Cancer (ARC), the Ligue contre le Cancer, ANR-15-CE11-0022-01 and ANR-10-LABX-0030-INRT, a French State fund managed by the Agence Nationale de la Recherche under the frame program Investissements d’Avenir ANR-10- IDEX-0002-02. We acknowledge the use of resources of the French Infrastructure for Integrated Structural Biology FRISBI ANR-10-INBS-05 and of Instruct-ERIC.
The authors declare no competing interests.
Peer review information Nature thanks Steve Hahn and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.
Publisher’s note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Extended data figures and tables
a, SAGA subunits are organized into the Tra1 lobe and the main lobe. The main lobe is divided into enzymatic HAT and DUB modules, a central module and a TBP-binding module. Overlaps appear as the central module is a scaffold for the assembly of all other modules. Abbreviations used owing to space limitations: Taf5 lissencephaly homology (LisH) domain (T5L), Taf6 linker domain (N83–S218, T6L), Taf9 C tail (N110–L139, T9T), Sgf73 NTD (M1–K69, ND), Sgf73 linker region (I70–H234, S73L), Sgf73 anchoring domain (E235–L277, S73A), Spt20 HIT domain interacting with Tra1 (M325–L340, HIT), Ada3 anchoring domains (K398–L471, A3A1) and (Y509–E557, A3A2) and bromodomain (BRD). The SEP domain found in Spt20 is named after S. cerevisiae Shp1, Drosophila melanogaster eyes closed gene (Eyc) and vertebrate P47. The FAT repeats are divided into three TRD domains and one HEAT-repeats domain (HRD). We defined three bridge-forming domains involved in connecting Tra1 to the central module: the Spt20 bridge (K184–K336, S20B), the Taf12 bridge (T430–K502, T12B) and the Spt3 bridge (E268–I304, S3B). The histone-fold domains, present in seven subunits, are highlighted as yellow boxes. b, Schematic representation and helix nomenclature for histone-fold domains. c, Original micrograph of frozen-hydrated P. pastoris SAGA–TBP complex. d, Two-dimensional class averages showing high-resolution structural features.
Extended Data Fig. 2 Cryo-EM data-analysis strategy and resolution assessment of the cryo-EM structures.
a, Image-processing strategy used to obtain the 3.5 Å resolution maps of the SAGA–TBP complex. Maps coloured in rainbow represent the local resolution of the reconstructions. FSC curves are depicted as a function of resolution in angstrom for the entire SAGA–TBP complex (black), the Tra1 lobe (blue) and the main lobe (red). cryoSPARC v.2 and cisTEM were used to generate the 3.5 Å resolution maps of the Tra1 and main lobes. RELION 3 was used for masked refinements and classifications of flexible regions, corresponding to TBP, the DUB module and Spt8. Dotted circles show the regions that were used to dock the crystal structures of TBP (PDB: 1TBP), Spt8 (homology model by Swiss-Model using PDB 4J87 as template) and the DUB module (PDB: 6AQR). b, c, Representative regions illustrating the quality of the cryo-EM map and the high-resolution structural features. Cryo-EM map and atomic model showing that side chains are clearly identified. b, Histone-fold domain of Taf9. c, Part of the Taf5 WD40 domain.
a, Pairwise alignment of TBP from P. pastoris and S. cerevisiae. Eight residues (out of 180) differ between the two organisms within the conserved C-terminal part of TBP (marked by a dotted line). These residues are mapped on the structure of cTBP (PDB: 1YTF). None of these residues occur in regions that contact SAGA (highlighted in red). b, Pairwise alignment of TFIIA subunits, Toa1 and Toa2, from P. pastoris and S. cerevisiae. The evolutionary conserved and structured domains of TFIIA (marked by dotted lines) show 60% identity and 80% similarity between the two organisms. It is worth noting that TBP and TFIIA have both been shown to be highly similar even across large evolutionary distances. For example, TBP, as well as Toa2, from yeast and human are functionally interchangeable in Pol II transcription61,62,63 and yeast TFIIA complements a mammalian in vitro transcription system depleted of TFIIA43. Hence, TBP and TFIIA from S. cerevisiae, which are easier to overproduce in E. coli, are valid substitutes in our experimental system for their homologues from the closely related budding yeast P. pastoris. c, Cryo-EM reconstructions determined in the presence (green) and in the absence (pink) of TBP. The enlarged panel shows the superimposition of both maps and highlights the additional density corresponding to TBP. d, Fitting of the cTBP crystal structure into the additional density observed in the SAGA–TBP complex. The α-loop denotes an α-helix from the linker connecting the two histone folds in Spt3. e, f, Fitting of the WD40 repeat of subunit Spt8 into the cryo-EM map of the SAGA–TBP complex next to TBP.
a, The Taf5 NTD and Taf6 HEAT repeats have different positions in SAGA and in TFIID. The structures of Taf5 NTD, Taf6 HEAT repeats and Taf5 WD40 domain in SAGA (left) and in the twin lobe of TFIID19 (right) are depicted. For the sake of clarity, all other parts of SAGA and TFIID were removed. To compare the position of the Taf5 NTD and Taf6 HEAT repeats between SAGA and TFIID, both complexes were aligned to have the same orientation of the Taf5 WD40 domain. The top face of the WD40 repeat, which is to a large extent free in TFIID, is nearly completely engaged in SAGA. The positions of the Taf5 NTD and Taf6 HEAT repeats are defined by direct interactions of the two domains between themselves, with the WD40 surface, and with the α-helix A352–D364 of Taf5. b, SAGA and TFIID share five subunits (Taf5 and the four histone fold-containing subunits Taf6, Taf9, Taf10 and Taf12). These subunits are present as one and two copies in SAGA and TFIID, respectively. The relative positions of these subunits are depicted in both complexes. Note that in TFIID, the TBP-binding lobe was poorly resolved19,20 and therefore the second copy of only the Taf6 HEAT repeats and Taf5 NTD is shown.
Extended Data Fig. 5 Interactions between histone-fold pairs in SAGA deviate from the nucleosome pattern already at the four-helix bundle preceding the weak association between Spt3 and Taf10.
The binding between the first two histone-fold pairs along the spiral (left), Taf6–Taf9 with Taf12–Ada1, shows little difference from the nucleosome, possibly reflecting the fact that these histone folds have the highest sequence similarity to histones. As in the nucleosome analogue, hydrophobic interactions have a very important role in this binding. By contrast, the four-helix bundle preceding the association between Spt3 and the Spt7–Taf10 pair, linking Taf12–Ada1 to Spt7–Taf10, is maintained almost solely by hydrogen and electrostatic bonds. Only side chains of residues that participate in the interactions are shown.
a, Experimental set-up for pull-down assays that investigate TBP and DNA interactions with SBP-tagged SAGA. b, Gel-shift assay as presented in Fig. 4b but using a longer (100-bp) Cy5-labelled DNA: TATA-containing promoter (TATAL), a TATA-like DNA probe (TATA-likeL) and a non-specific DNA probe (TATA-lessL). The asterisk indicates non-specific DNA association with SAGA. c, Cy5-labelled DNA was almost exclusively double-stranded. Annealed Cy5-labelled DNA used in gel-shift and pull-down assays was loaded on a polyacrylamide 12% gel. Single stranded Cy5-labelled TATA DNA was loaded for comparison. d, Summary of mass-spectrometry data for the major shifted DNA band (Fig. 4, lane 3) showing that it contains both TBP and TFIIA as its major constituents. The spectral count divided by the length in amino acids (PSM/AA) of each protein was normalized with respect to PSM/AA of TBP (raw data are provided in Supplementary Table 1). e, Summary of mass-spectrometry data of purified SAGA. To estimate stoichiometry, PSM/AA was calculated for each protein and normalized with respect to PSM/AA of subunit Tra1 (raw data are provided in Supplementary Table 2). Experiments were repeated three to four times.
a, Two-dimensional classes of SAGA side views revealing different positions of the enzymatic HAT and DUB modules. Bottom, approximate positions of the modules are highlighted in yellow for the HAT module and in blue for the DUB module. The HAT module seems more diffuse and flexible than the DUB module, whose position fluctuates less. b, Docking of the DUB crystal structure (PDB: 6AQR) into the 15 Å resolution cryo-EM map reconstructed from a small class of particles that probably share a similar position for the DUB. c, Domain organization of the Sgf73 subunit. d, The Sgf73 linker tethers DUB to the central module. The linker (S73L) connecting the N-terminal end (ND), which is part of the DUB, and the anchoring domain (S73A) embedded in the central module, includes a SCA7 domain but additionally includes roughly 90 amino acids predicted to be unstructured. All residues that cross-link36 to the Sgf73 linker can be mapped on the surface of SAGA. These residues are depicted with light-blue spheres. A putative path for the 164-residue-long linker is delineated (dashed) according to the cross-linking sites and scarce traces of the linker found in the cryo-EM map. The top insert shows the density that forms contact between DUB and the central module. This contact point is located next to the Spt20 SEP and Taf5 LisH domains and is the only trace of the flexible Sgf73 linker in our maps. e, Two helical domains (ochre) anchor the HAT module at the surface of the Taf6 HEAT repeats (red). f, These helical domains are assigned to Ada3. Domain-deletion analysis identified two domains in Ada3 and one in Ada2 that serve to dock HAT on SAGA and whose deletion results in the release of intact HAT from SAGA36. Fit between the maps and secondary structure predictions (PSIPRED 3.3) or 3D structure of the Ada3 and Ada2 domains is presented in addition to available cross-linking data between these domains and the Taf6 HEAT repeats.
Extended Data Fig. 9 Protein loops and tails contribute to an intricate network of interactions and to bridges between the central module and Tra1.
a, Bridge established by the loop connecting the second and third helices of the cSpt3 histone fold (brown). b, The loop between helices α2 and α3 of the cSpt3 histone fold inserts between two helices of Tra1. Aromatic stacking interactions are formed between Spt3 F294 of this loop and F2404 and F2422 of Tra1. The map density for these three phenylalanine residues is depicted. c, The C-terminal tail of Taf9 (R101–L139) and the short preceding loop illustrate the importance of regions lacking secondary structure elements in SAGA. These parts of Taf9 interact with many subunits and domains, including the Spt3 C′ tail, Spt20 bridge domain, Taf12 histone fold, Ada1, Sgf73 anchoring domain, Taf6 histone fold, Spt7 histone fold, Taf5 WD40, Taf5 NTD and Taf10 histone fold.
Original scanned gels used to produce Figure 4b and Extended Data Figure 7b-c.
Mass spectrometry analysis of the shifted band in gel shift assays.
Mass spectrometry analysis of purified SAGA.
The video shows the EM maps and the derived SAGA structure. It first depicts the central position of the Taf5 WD40 propeller that coordinates the Taf6 HEAT repeats, the Taf5-NTD and the histone-fold octamer. The TBP binding site at the periphery of the deformed octamer is then shown in detail. The video ends by highlighting the connections between the Tra1 and Main lobes as well as the incorporation into the central domain of the Sgf73 subunit which connects to the DUB enzymatic module.
Video 2: The deformed histone-fold octamer in SAGA compared to the symmetrical histone octamer of the nucleosome
The video shows the helix-by-helix alignment of the SAGA histone-fold octamer to the histone octamer and morphs between the aligned and original conformations to highlight the changes.
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Papai, G., Frechard, A., Kolesnikova, O. et al. Structure of SAGA and mechanism of TBP deposition on gene promoters. Nature 577, 711–716 (2020). https://doi.org/10.1038/s41586-020-1944-2
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