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- EMDB-3728: RNA polymerase I pre-initiation complex (CF focused refinement) -

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Basic information

Entry
Database: EMDB / ID: EMD-3728
TitleRNA polymerase I pre-initiation complex (CF focused refinement)
Map data
Sample
  • Complex: RNA polymerase I pre-initiation complex with Core Factor, Rrn3 and transcription scaffold
    • Protein or peptide: RRN11_YEAST RNA polymerase I-specific transcription initiation factor RRN11
    • Protein or peptide: RRN7_YEAST RNA polymerase I-specific transcription initiation factor RRN7
    • Protein or peptide: RRN6_YEAST RNA polymerase I-specific transcription initiation factor RRN6
    • DNA: non-template strand DNA
    • DNA: template strand DNA
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.0 Å
AuthorsSadian Y / Tafur L / Kosinski J / Jakobi AJ / Wetzel R / Buczak K / Hagen WJH / Beck M / Sachse C / Muller CW
CitationJournal: EMBO J / Year: 2017
Title: Structural insights into transcription initiation by yeast RNA polymerase I.
Authors: Yashar Sadian / Lucas Tafur / Jan Kosinski / Arjen J Jakobi / Rene Wetzel / Katarzyna Buczak / Wim Jh Hagen / Martin Beck / Carsten Sachse / Christoph W Müller /
Abstract: In eukaryotic cells, RNA polymerase I (Pol I) synthesizes precursor ribosomal RNA (pre-rRNA) that is subsequently processed into mature rRNA. To initiate transcription, Pol I requires the assembly of ...In eukaryotic cells, RNA polymerase I (Pol I) synthesizes precursor ribosomal RNA (pre-rRNA) that is subsequently processed into mature rRNA. To initiate transcription, Pol I requires the assembly of a multi-subunit pre-initiation complex (PIC) at the ribosomal RNA promoter. In yeast, the minimal PIC includes Pol I, the transcription factor Rrn3, and Core Factor (CF) composed of subunits Rrn6, Rrn7, and Rrn11. Here, we present the cryo-EM structure of the 18-subunit yeast Pol I PIC bound to a transcription scaffold. The cryo-EM map reveals an unexpected arrangement of the DNA and CF subunits relative to Pol I. The upstream DNA is positioned differently than in any previous structures of the Pol II PIC. Furthermore, the TFIIB-related subunit Rrn7 also occupies a different location compared to the Pol II PIC although it uses similar interfaces as TFIIB to contact DNA. Our results show that although general features of eukaryotic transcription initiation are conserved, Pol I and Pol II use them differently in their respective transcription initiation complexes.
History
DepositionMay 17, 2017-
Header (metadata) releaseJun 7, 2017-
Map releaseJul 26, 2017-
UpdateSep 27, 2017-
Current statusSep 27, 2017Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.0079
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 0.0079
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-5oa1
  • Surface level: 0.0079
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_3728.png

Downloads & links

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Map

FileDownload / File: emd_3728.map.gz / Format: CCP4 / Size: 91.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.35 Å
Density
Contour LevelBy AUTHOR: 0.0079 / Movie #1: 0.0079
Minimum - Maximum-0.06729799 - 0.10905698
Average (Standard dev.)0.00007751664 (±0.0017210566)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions288288288
Spacing288288288
CellA=B=C: 388.80002 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.351.351.35
M x/y/z288288288
origin x/y/z0.0000.0000.000
length x/y/z388.800388.800388.800
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS288288288
D min/max/mean-0.0670.1090.000

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Supplemental data

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Sample components

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Entire : RNA polymerase I pre-initiation complex with Core Factor, Rrn3 an...

EntireName: RNA polymerase I pre-initiation complex with Core Factor, Rrn3 and transcription scaffold
Components
  • Complex: RNA polymerase I pre-initiation complex with Core Factor, Rrn3 and transcription scaffold
    • Protein or peptide: RRN11_YEAST RNA polymerase I-specific transcription initiation factor RRN11
    • Protein or peptide: RRN7_YEAST RNA polymerase I-specific transcription initiation factor RRN7
    • Protein or peptide: RRN6_YEAST RNA polymerase I-specific transcription initiation factor RRN6
    • DNA: non-template strand DNA
    • DNA: template strand DNA

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Supramolecule #1: RNA polymerase I pre-initiation complex with Core Factor, Rrn3 an...

SupramoleculeName: RNA polymerase I pre-initiation complex with Core Factor, Rrn3 and transcription scaffold
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)

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Macromolecule #1: RRN11_YEAST RNA polymerase I-specific transcription initiation fa...

MacromoleculeName: RRN11_YEAST RNA polymerase I-specific transcription initiation factor RRN11
type: protein_or_peptide / ID: 1 / Enantiomer: LEVO
SequenceString: MFEVPITLTN RKFAQRRKLK YQYINYISRR FDRISKKSTT TDSLPTPENS AAENNDEEEG QNSEAGTYR RSVLQQKKRR RERHWRSVVG EIYSTTESET DSQEEETEEG GEHDTGIDKE D SDEERKFW KKYEKPEKSF EIWRTVSSQN KQPINKQKMT YHNFKKIEKI ...String:
MFEVPITLTN RKFAQRRKLK YQYINYISRR FDRISKKSTT TDSLPTPENS AAENNDEEEG QNSEAGTYR RSVLQQKKRR RERHWRSVVG EIYSTTESET DSQEEETEEG GEHDTGIDKE D SDEERKFW KKYEKPEKSF EIWRTVSSQN KQPINKQKMT YHNFKKIEKI PLRKMEIPLL HC TKENKLY FQSISRGLEP LKTSTSEVRN YRTRHIVTLT DLLHLNVSRH NWSLAYKIFA TLI RIPGVQ IKSLWGIGVE ILDNLSNSSS GLDFLQWMCQ IYSSKSRFVQ NINYRSIVPP FQTG SRTHT AKFAITYLWS SLINCQKSME PSSNIIDKPF DTENDLLQEL IDKISEWVLT PPFME DAEV WFIYASCHLL KADTLSRQFV NDNKNNDLIG LDRDIKINQV IKHIHYVRTF LKICLD KGG FAVPSRLIEN QLKSFESRLY GEAQDIQERD VANVYDSIDN SSVENSFGDV YETNAEF LD TQLMDLSPED NGLDEMHYSD EDSSE

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Macromolecule #2: RRN7_YEAST RNA polymerase I-specific transcription initiation fac...

MacromoleculeName: RRN7_YEAST RNA polymerase I-specific transcription initiation factor RRN7
type: protein_or_peptide / ID: 2 / Enantiomer: LEVO
SequenceString: MSTFIRGPIC GTDNCPSRLW RIIDGRRTCQ YGHVMEGDVE FNDDEDDLNG LGAGVITRRL NLTTNATGS FQSSQLTNSQ LLQQQQRQSH KKFKKLIGHE AKLLFLKSFQ FILKRQIRWL I TEMRFPKE FEHVAKIIWL KILKTINDQP QEELKLQLHM TSTISILYLA ...String:
MSTFIRGPIC GTDNCPSRLW RIIDGRRTCQ YGHVMEGDVE FNDDEDDLNG LGAGVITRRL NLTTNATGS FQSSQLTNSQ LLQQQQRQSH KKFKKLIGHE AKLLFLKSFQ FILKRQIRWL I TEMRFPKE FEHVAKIIWL KILKTINDQP QEELKLQLHM TSTISILYLA STHLSLPVYT CD YIKWICT AKMPYFQASE ILPKSWRIQL PNYYVSILEG SISPFNGQLY NKIALTCGMI HFK EFFNSE ISCQGLLLKL VMQCALPPEF YFYTKQVIEF EETDIRNLTL WERTDERHTG RVSN HAELR VLSYFMLTIN WMLSFDRDRQ YPLKWILSLT ESLTQRTTTS ESIGRNIVKV VYPDK PTSS DYFQWSEEET LEFLKWMEKQ FLPTQTKSLH NENGSMEMTI DQKIARRKLY KIFPLD REA NHDGEFNDST HQLTFIEDLQ ERYAKQTPFF ESNKIRDSLN YQEANPPARK EAIGRLL TH IASQLLVDFA ISKEQLKDCI SRIKNACLHR MN

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Macromolecule #3: RRN6_YEAST RNA polymerase I-specific transcription initiation fac...

MacromoleculeName: RRN6_YEAST RNA polymerase I-specific transcription initiation factor RRN6
type: protein_or_peptide / ID: 3 / Enantiomer: LEVO
SequenceString: MSEGQIPSSD VLGSQLGVGV QGASLYCPQE NYTTKKQEKP QWLRPVDDTL AEDALDLHIV VKSLLCDTA IRYISDDKVL QESDADDDLI TSDIDEDTDN QGDTSIVVNP VIPVVPKDVH F FKKVDVGN DSMFGVNCDT PVSFQDYIPS DLLRNLDDTL QESTNSSRPM ...String:
MSEGQIPSSD VLGSQLGVGV QGASLYCPQE NYTTKKQEKP QWLRPVDDTL AEDALDLHIV VKSLLCDTA IRYISDDKVL QESDADDDLI TSDIDEDTDN QGDTSIVVNP VIPVVPKDVH F FKKVDVGN DSMFGVNCDT PVSFQDYIPS DLLRNLDDTL QESTNSSRPM QDAFFWDPTV AN RLDSQYI QTASDLRNYR DGTEIIAYAS GKTGSVLNIA VLTRQNTLHL NRHNNVTSIE LHS PIKSIK IPGASESIGR RSNLVGIITE NSFQIFRIES VHSRSCDVMV SSSEPLYFVE IDDL QVVDF AFNPWDLQQF AIIDIKGNWS IGRIPKNFNN NNKRKLQLID NLHGTIFDPE ELSSW KRIE WFSHFQKILV FDRSKMIEID FMNNWQTEVV QAKAWSNIRD YKRIDDKNGI LLTSRE III VGASESNDPV RRISWKHDLD PDDTTLRITV QKVKKPDHIL LVAFVYSMRH KRIYMHV FS HRKANLFQSL GCSTVLEIPG GTPTGIETIL TLDHIDDESR REEDADENFE LVVDFLVK L RNSSEVYYYA LSNTQNSEPN KQETPIIVDH PEWASLFNNA DEREKESIGA LVSQIKLKE RERISRVQNL IEHENSHDED KYLQDLGYRL SIATNELLES WQKTKDESIL SGSLSHSKLK NLLENSDSF ASIPEFSSLL DQFFQYYQDQ DVTFIGFEKL LHLFLHEDVP GLDIFYNKLL Q CWVLVSPQ AELLTKEIVK DIIWSLARLE KPSLFEPIQN EISRSLSGPY QDIISSWDMD DI NEEDESN EFNFDSQFSA PFNGRPPFNL NSQSQIPTIK SSQSSGLARR KRILKTQSQK ATP LSQSTQ NLSVLPDSMT PAFTLMQPPS SQISFVNDSQ PRNSQKAKKK KKRIRGFG

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Macromolecule #4: non-template strand DNA

MacromoleculeName: non-template strand DNA / type: dna / ID: 4 / Classification: DNA
SequenceString:
GGTTTAGTCA TGGAGTACAA GTGTGAGGAA AAGTAGTTGG CGTAGCAGGA GAAGTAAAGC AGTTGAAGAC

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Macromolecule #5: template strand DNA

MacromoleculeName: template strand DNA / type: dna / ID: 5 / Classification: DNA
SequenceString:
CCAAATCAGT ACCTCATGTT CACACTCCTT TTCATCAACC CTCCATGAAG TACGCTTTCG TCAACTTCTG

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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

Concentration0.2 mg/mL
BufferpH: 7.5
GridMaterial: COPPER / Support film - Material: CARBON / Support film - topology: HOLEY
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Instrument: FEI VITROBOT MARK II

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 4.0 µm / Nominal defocus min: 0.75 µm / Nominal magnification: 105000
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Number real images: 4235 / Average exposure time: 20.0 sec. / Average electron dose: 2.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: CTFFIND (ver. 4)
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 1.4) / Number images used: 38589

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