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- EMDB-14696: Protomeric substructure from an octameric assembly of M. tubercul... -

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Entry
Database: EMDB / ID: EMD-14696
TitleProtomeric substructure from an octameric assembly of M. tuberculosis RNA polymerase in complex with sigma-b initiation factor
Map datasharpened map
Sample
  • Complex: M. tuberculosis RNA polymerase in complex with sigma-b initiation factor
    • Protein or peptide: DNA-directed RNA polymerase subunit alphaPolymerase
    • Protein or peptide: DNA-directed RNA polymerase subunit betaPolymerase
    • Protein or peptide: DNA-directed RNA polymerase subunit beta'Polymerase
    • Protein or peptide: DNA-directed RNA polymerase subunit omegaPolymerase
    • Protein or peptide: RNA polymerase sigma factor SigB
  • Ligand: ZINC ION
  • Ligand: MAGNESIUM ION
KeywordsRNA polymerase / self-assembly / octamer / tuberculosis / stress response / hibernation / TRANSCRIPTION
Function / homology
Function and homology information


Antimicrobial action and antimicrobial resistance in Mtb / sigma factor activity / peptidoglycan-based cell wall / DNA-directed RNA polymerase complex / DNA-templated transcription initiation / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity / DNA-directed RNA polymerase / protein dimerization activity / response to antibiotic ...Antimicrobial action and antimicrobial resistance in Mtb / sigma factor activity / peptidoglycan-based cell wall / DNA-directed RNA polymerase complex / DNA-templated transcription initiation / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity / DNA-directed RNA polymerase / protein dimerization activity / response to antibiotic / DNA-templated transcription / magnesium ion binding / DNA binding / zinc ion binding / plasma membrane / cytosol / cytoplasm
Similarity search - Function
Sigma-70 factors family signature 1. / RNA polymerase sigma-70 region 1.2 / Sigma-70 factor, region 1.2 / RNA polymerase sigma-70 region 3 / Sigma-70 region 3 / Sigma-70 factors family signature 2. / RNA polymerase sigma-70 / RNA polymerase sigma-70 region 4 / Sigma-70, region 4 / RNA polymerase sigma-70 region 2 ...Sigma-70 factors family signature 1. / RNA polymerase sigma-70 region 1.2 / Sigma-70 factor, region 1.2 / RNA polymerase sigma-70 region 3 / Sigma-70 region 3 / Sigma-70 factors family signature 2. / RNA polymerase sigma-70 / RNA polymerase sigma-70 region 4 / Sigma-70, region 4 / RNA polymerase sigma-70 region 2 / RNA polymerase sigma-70 like domain / Sigma-70 region 2 / RNA polymerase sigma factor, region 2 / RNA polymerase sigma factor, region 3/4-like / DNA-directed RNA polymerase, omega subunit / DNA-directed RNA polymerase, subunit beta-prime, bacterial type / DNA-directed RNA polymerase, beta subunit, external 1 domain superfamily / DNA-directed RNA polymerase, beta subunit, external 1 domain / RNA polymerase beta subunit external 1 domain / RNA polymerase, alpha subunit, C-terminal / Bacterial RNA polymerase, alpha chain C terminal domain / DNA-directed RNA polymerase, alpha subunit / DNA-directed RNA polymerase beta subunit, bacterial-type / RNA polymerase Rpb6 / RNA polymerase, subunit omega/Rpo6/RPB6 / RNA polymerase Rpb6 / RNA polymerase Rpb1, domain 3 superfamily / RNA polymerase Rpb1, clamp domain superfamily / RPB6/omega subunit-like superfamily / DNA-directed RNA polymerase, subunit beta-prime / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb2, domain 2 superfamily / RNA polymerase Rpb1, domain 1 / RNA polymerase Rpb1, domain 1 / RNA polymerase, alpha subunit / RNA polymerase Rpb1, domain 4 / RNA polymerase Rpb1, domain 2 / RNA polymerase Rpb1, domain 4 / RNA polymerase, N-terminal / RNA polymerase Rpb1, funnel domain superfamily / RNA polymerase I subunit A N-terminus / RNA polymerase Rpb1, domain 5 / RNA polymerase Rpb1, domain 5 / RNA polymerase, beta subunit, protrusion / RNA polymerase beta subunit / DNA-directed RNA polymerase, insert domain / DNA-directed RNA polymerase, RpoA/D/Rpb3-type / RNA polymerase Rpb3/RpoA insert domain / RNA polymerase Rpb3/Rpb11 dimerisation domain / RNA polymerases D / DNA-directed RNA polymerase, insert domain superfamily / RNA polymerase, RBP11-like subunit / RNA polymerase Rpb2, domain 2 / RNA polymerase Rpb2, domain 2 / RNA polymerase, beta subunit, conserved site / RNA polymerase Rpb2, domain 7 / RNA polymerase Rpb2, domain 3 / RNA polymerase Rpb2, OB-fold / RNA polymerase Rpb2, domain 7 / RNA polymerase Rpb2, domain 3 / RNA polymerases beta chain signature. / DNA-directed RNA polymerase, subunit 2, hybrid-binding domain / DNA-directed RNA polymerase, subunit 2 / DNA-directed RNA polymerase, subunit 2, hybrid-binding domain superfamily / RNA polymerase Rpb2, domain 6 / Winged helix-like DNA-binding domain superfamily
Similarity search - Domain/homology
RNA polymerase sigma factor SigB / DNA-directed RNA polymerase subunit omega / DNA-directed RNA polymerase subunit beta' / DNA-directed RNA polymerase subunit beta / DNA-directed RNA polymerase subunit alpha
Similarity search - Component
Biological speciesMycobacterium tuberculosis (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.86 Å
AuthorsTrapani S / Bron P / Lai Kee Him J / Brodolin K / Morichaud Z / Vishwakarma R
Funding support France, 3 items
OrganizationGrant numberCountry
French National Research AgencyANR-16-CE11-0025 France
French Infrastructure for Integrated Structural Biology (FRISBI)ANR-10-INBS-05 France
INSTRUCT-ERIC (Strasbourg Centre)1309 France
Citation
Journal: Nat Commun / Year: 2023
Title: Structural basis of the mycobacterial stress-response RNA polymerase auto-inhibition via oligomerization.
Authors: Zakia Morichaud / Stefano Trapani / Rishi K Vishwakarma / Laurent Chaloin / Corinne Lionne / Joséphine Lai-Kee-Him / Patrick Bron / Konstantin Brodolin /
Abstract: Self-assembly of macromolecules into higher-order symmetric structures is fundamental for the regulation of biological processes. Higher-order symmetric structure self-assembly by the gene expression ...Self-assembly of macromolecules into higher-order symmetric structures is fundamental for the regulation of biological processes. Higher-order symmetric structure self-assembly by the gene expression machinery, such as bacterial DNA-dependent RNA polymerase (RNAP), has never been reported before. Here, we show that the stress-response σ factor from the human pathogen, Mycobacterium tuberculosis, induces the RNAP holoenzyme oligomerization into a supramolecular complex composed of eight RNAP units. Cryo-electron microscopy revealed a pseudo-symmetric structure of the RNAP octamer in which RNAP protomers are captured in an auto-inhibited state and display an open-clamp conformation. The structure shows that σ is sequestered by the RNAP flap and clamp domains. The transcriptional activator RbpA prevented octamer formation by promoting the initiation-competent RNAP conformation. Our results reveal that a non-conserved region of σ is an allosteric controller of transcription initiation and demonstrate how basal transcription factors can regulate gene expression by modulating the RNAP holoenzyme assembly and hibernation.
#1: Journal: Biorxiv / Year: 2022
Title: Structural basis of the mycobacterial stress-response RNA polymerase auto-inhibition via oligomerization
Authors: Morichaud Z / Trapani S / Vishwakarma R / Chaloin L / Lionne C / Lai-Kee-Him J / Bron P / Brodolin K
History
DepositionMar 31, 2022-
Header (metadata) releaseFeb 8, 2023-
Map releaseFeb 8, 2023-
UpdateMar 27, 2024-
Current statusMar 27, 2024Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_14696.png

Downloads & links

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Map

FileDownload / File: emd_14696.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationsharpened map
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1.1 Å/pix.
x 400 pix.
= 440. Å		1.1 Å/pix.
x 400 pix.
= 440. Å		1.1 Å/pix.
x 400 pix.
= 440. Å

Surface

Projections

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.03
Minimum - Maximum-0.15515698 - 0.24623482
Average (Standard dev.)-0.0004581522 (±0.004464976)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 440.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Additional map: unsharpened map

Fileemd_14696_additional_1.map
Annotationunsharpened map
Projections & Slices
AxesZYX

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Additional map: octameric assembly of (alpha,alpha,beta,beta',omega,sigma-b) protomers....

Fileemd_14696_additional_2.map
Annotationoctameric assembly of (alpha,alpha,beta,beta',omega,sigma-b) protomers.
Projections & Slices
AxesZYX

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Half map: #2

Fileemd_14696_half_map_1.map
Projections & Slices
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Half map: #1

Fileemd_14696_half_map_2.map
Projections & Slices
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Sample components

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Entire : M. tuberculosis RNA polymerase in complex with sigma-b initiation...

EntireName: M. tuberculosis RNA polymerase in complex with sigma-b initiation factor
Components
  • Complex: M. tuberculosis RNA polymerase in complex with sigma-b initiation factor
    • Protein or peptide: DNA-directed RNA polymerase subunit alphaPolymerase
    • Protein or peptide: DNA-directed RNA polymerase subunit betaPolymerase
    • Protein or peptide: DNA-directed RNA polymerase subunit beta'Polymerase
    • Protein or peptide: DNA-directed RNA polymerase subunit omegaPolymerase
    • Protein or peptide: RNA polymerase sigma factor SigB
  • Ligand: ZINC ION
  • Ligand: MAGNESIUM ION

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Supramolecule #1: M. tuberculosis RNA polymerase in complex with sigma-b initiation...

SupramoleculeName: M. tuberculosis RNA polymerase in complex with sigma-b initiation factor
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Mycobacterium tuberculosis (bacteria)
Molecular weightTheoretical: 101 KDa

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Macromolecule #1: DNA-directed RNA polymerase subunit alpha

MacromoleculeName: DNA-directed RNA polymerase subunit alpha / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO / EC number: DNA-directed RNA polymerase
Source (natural)Organism: Mycobacterium tuberculosis (bacteria) / Strain: ATCC 25618 / H37Rv
Molecular weightTheoretical: 37.745328 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MLISQRPTLS EDVLTDNRSQ FVIEPLEPGF GYTLGNSLRR TLLSSIPGAA VTSIRIDGVL HEFTTVPGVK EDVTEIILNL KSLVVSSEE DEPVTMYLRK QGPGEVTAGD IVPPAGVTVH NPGMHIATLN DKGKLEVELV VERGRGYVPA VQNRASGAEI G RIPVDSIY ...String:
MLISQRPTLS EDVLTDNRSQ FVIEPLEPGF GYTLGNSLRR TLLSSIPGAA VTSIRIDGVL HEFTTVPGVK EDVTEIILNL KSLVVSSEE DEPVTMYLRK QGPGEVTAGD IVPPAGVTVH NPGMHIATLN DKGKLEVELV VERGRGYVPA VQNRASGAEI G RIPVDSIY SPVLKVTYKV DATRVEQRTD FDKLILDVET KNSISPRDAL ASAGKTLVEL FGLARELNVE AEGIEIGPSP AE ADHIASF ALPIDDLDLT VRSYNCLKRE GVHTVGELVA RTESDLLDIR NFGQKSIDEV KIKLHQLGLS LKDSPPSFDP SEV AGYDVA TGTWSTEGAY DEQDYAETEQ L

UniProtKB: DNA-directed RNA polymerase subunit alpha

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Macromolecule #2: DNA-directed RNA polymerase subunit beta

MacromoleculeName: DNA-directed RNA polymerase subunit beta / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA-directed RNA polymerase
Source (natural)Organism: Mycobacterium tuberculosis (bacteria) / Strain: ATCC 25618 / H37Rv
Molecular weightTheoretical: 129.602344 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MVLADSRQSK TAASPSPSRP QSSSNNSVPG APNRVSFAKL REPLEVPGLL DVQTDSFEWL IGSPRWRESA AERGDVNPVG GLEEVLYEL SPIEDFSGSM SLSFSDPRFD DVKAPVDECK DKDMTYAAPL FVTAEFINNN TGEIKSQTVF MGDFPMMTEK G TFIINGTE ...String:
MVLADSRQSK TAASPSPSRP QSSSNNSVPG APNRVSFAKL REPLEVPGLL DVQTDSFEWL IGSPRWRESA AERGDVNPVG GLEEVLYEL SPIEDFSGSM SLSFSDPRFD DVKAPVDECK DKDMTYAAPL FVTAEFINNN TGEIKSQTVF MGDFPMMTEK G TFIINGTE RVVVSQLVRS PGVYFDETID KSTDKTLHSV KVIPSRGAWL EFDVDKRDTV GVRIDRKRRQ PVTVLLKALG WT SEQIVER FGFSEIMRST LEKDNTVGTD EALLDIYRKL RPGEPPTKES AQTLLENLFF KEKRYDLARV GRYKVNKKLG LHV GEPITS STLTEEDVVA TIEYLVRLHE GQTTMTVPGG VEVPVETDDI DHFGNRRLRT VGELIQNQIR VGMSRMERVV RERM TTQDV EAITPQTLIN IRPVVAAIKE FFGTSQLSQF MDQNNPLSGL THKRRLSALG PGGLSRERAG LEVRDVHPSH YGRMC PIET PEGPNIGLIG SLSVYARVNP FGFIETPYRK VVDGVVSDEI VYLTADEEDR HVVAQANSPI DADGRFVEPR VLVRRK AGE VEYVPSSEVD YMDVSPRQMV SVATAMIPFL EHDDANRALM GANMQRQAVP LVRSEAPLVG TGMELRAAID AGDVVVA EE SGVIEEVSAD YITVMHDNGT RRTYRMRKFA RSNHGTCANQ CPIVDAGDRV EAGQVIADGP CTDDGEMALG KNLLVAIM P WEGHNYEDAI ILSNRLVEED VLTSIHIEEH EIDARDTKLG AEEITRDIPN ISDEVLADLD ERGIVRIGAE VRDGDILVG KVTPKGETEL TPEERLLRAI FGEKAREVRD TSLKVPHGES GKVIGIRVFS REDEDELPAG VNELVRVYVA QKRKISDGDK LAGRHGNKG VIGKILPVED MPFLADGTPV DIILNTHGVP RRMNIGQILE THLGWCAHSG WKVDAAKGVP DWAARLPDEL L EAQPNAIV STPVFDGAQE AELQGLLSCT LPNRDGDVLV DADGKAMLFD GRSGEPFPYP VTVGYMYIMK LHHLVDDKIH AR STGPYSM ITQQPLGGKA QFGGQRFGEM ECWAMQAYGA AYTLQELLTI KSDDTVGRVK VYEAIVKGEN IPEPGIPESF KVL LKELQS LCLNVEVLSS DGAAIELREG EDEDLERAAA NLGINLSRNE SASVEDLA

UniProtKB: DNA-directed RNA polymerase subunit beta

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Macromolecule #3: DNA-directed RNA polymerase subunit beta'

MacromoleculeName: DNA-directed RNA polymerase subunit beta' / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA-directed RNA polymerase
Source (natural)Organism: Mycobacterium tuberculosis (bacteria) / Strain: ATCC 25618 / H37Rv
Molecular weightTheoretical: 147.438344 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: VNFFDELRIG LATAEDIRQW SYGEVKKPET INYRTLKPEK DGLFCEKIFG PTRDWECYCG KYKRVRFKGI ICERCGVEVT RAKVRRERM GHIELAAPVT HIWYFKGVPS RLGYLLDLAP KDLEKIIYFA AYVITSVDEE MRHNELSTLE AEMAVERKAV E DQRDGELE ...String:
VNFFDELRIG LATAEDIRQW SYGEVKKPET INYRTLKPEK DGLFCEKIFG PTRDWECYCG KYKRVRFKGI ICERCGVEVT RAKVRRERM GHIELAAPVT HIWYFKGVPS RLGYLLDLAP KDLEKIIYFA AYVITSVDEE MRHNELSTLE AEMAVERKAV E DQRDGELE ARAQKLEADL AELEAEGAKA DARRKVRDGG EREMRQIRDR AQRELDRLED IWSTFTKLAP KQLIVDENLY RE LVDRYGE YFTGAMGAES IQKLIENFDI DAEAESLRDV IRNGKGQKKL RALKRLKVVA AFQQSGNSPM GMVLDAVPVI PPE LRPMVQ LDGGRFATSD LNDLYRRVIN RNNRLKRLID LGAPEIIVNN EKRMLQESVD ALFDNGRRGR PVTGPGNRPL KSLS DLLKG KQGRFRQNLL GKRVDYSGRS VIVVGPQLKL HQCGLPKLMA LELFKPFVMK RLVDLNHAQN IKSAKRMVER QRPQV WDVL EEVIAEHPVL LNRAPTLHRL GIQAFEPMLV EGKAIQLHPL VCEAFNADFD GDQMAVHLPL SAEAQAEARI LMLSSN NIL SPASGRPLAM PRLDMVTGLY YLTTEVPGDT GEYQPASGDH PETGVYSSPA EAIMAADRGV LSVRAKIKVR LTQLRPP VE IEAELFGHSG WQPGDAWMAE TTLGRVMFNE LLPLGYPFVN KQMHKKVQAA IINDLAERYP MIVVAQTVDK LKDAGFYW A TRSGVTVSMA DVLVPPRKKE ILDHYEERAD KVEKQFQRGA LNHDERNEAL VEIWKEATDE VGQALREHYP DDNPIITIV DSGATGNFTQ TRTLAGMKGL VTNPKGEFIP RPVKSSFREG LTVLEYFINT HGARKGLADT ALRTADSGYL TRRLVDVSQD VIVREHDCQ TERGIVVELA ERAPDGTLIR DPYIETSAYA RTLGTDAVDE AGNVIVERGQ DLGDPEIDAL LAAGITQVKV R SVLTCATS TGVCATCYGR SMATGKLVDI GEAVGIVAAQ SIGEPGTQLT MRTFHQGGVG EDITGGLPRV QELFEARVPR GK APIADVT GRVRLEDGER FYKITIVPDD GGEEVVYDKI SKRQRLRVFK HEDGSERVLS DGDHVEVGQQ LMEGSADPHE VLR VQGPRE VQIHLVREVQ EVYRAQGVSI HDKHIEVIVR QMLRRVTIID SGSTEFLPGS LIDRAEFEAE NRRVVAEGGE PAAG RPVLM GITKASLATD SWLSAASFQE TTRVLTDAAI NCRSDKLNGL KENVIIGKLI PAGTGINRYR NIAVQPTEEA RAAAY TIPS YEDQYYSPDF GAATGAAVPL DDYGYSDYRH HHHHH

UniProtKB: DNA-directed RNA polymerase subunit beta'

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Macromolecule #4: DNA-directed RNA polymerase subunit omega

MacromoleculeName: DNA-directed RNA polymerase subunit omega / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA-directed RNA polymerase
Source (natural)Organism: Mycobacterium tuberculosis (bacteria) / Strain: ATCC 25618 / H37Rv
Molecular weightTheoretical: 11.85114 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MSISQSDASL AAVPAVDQFD PSSGASGGYD TPLGITNPPI DELLDRVSSK YALVIYAAKR ARQINDYYNQ LGEGILEYVG PLVEPGLQE KPLSIALREI HADLLEHTEG E

UniProtKB: DNA-directed RNA polymerase subunit omega

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Macromolecule #5: RNA polymerase sigma factor SigB

MacromoleculeName: RNA polymerase sigma factor SigB / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mycobacterium tuberculosis (bacteria) / Strain: ATCC 25618 / H37Rv
Molecular weightTheoretical: 38.572773 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MGSSHHHHHH SSGLVPRGSH MADAPTRATT SRVDSDLDAQ SPAADLVRVY LNGIGKTALL NAAGEVELAK RIEAGLYAEH LLETRKRLG ENRKRDLAAV VRDGEAARRH LLEANLRLVV SLAKRYTGRG MPLLDLIQEG NLGLIRAMEK FDYTKGFKFS T YATWWIRQ ...String:
MGSSHHHHHH SSGLVPRGSH MADAPTRATT SRVDSDLDAQ SPAADLVRVY LNGIGKTALL NAAGEVELAK RIEAGLYAEH LLETRKRLG ENRKRDLAAV VRDGEAARRH LLEANLRLVV SLAKRYTGRG MPLLDLIQEG NLGLIRAMEK FDYTKGFKFS T YATWWIRQ AITRGMADQS RTIRLPVHLV EQVNKLARIK REMHQHLGRE ATDEELAAES GIPIDKINDL LEHSRDPVSL DM PVGSEEE APLGDFIEDA EAMSAENAVI AELLHTDIRS VLATLDEREH QVIRLRFGLD DGQPRTLDQI GKLFGLSRER VRQ IERDVM SKLRHGERAD RLRSYAS

UniProtKB: RNA polymerase sigma factor SigB

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Macromolecule #6: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 6 / Number of copies: 2 / Formula: ZN
Molecular weightTheoretical: 65.409 Da

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Macromolecule #7: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 7 / Number of copies: 1 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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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

Concentration1.21 mg/mL
BufferpH: 8
Component:
ConcentrationNameFormula
20.0 mmol/LHEPES
150.0 mmol/Lsodium chlorideNaClSodium chloride
5.0 mmol/Lmagnesium sulfateMgSO4
GridModel: Quantifoil R2/2 / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY ARRAY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 10 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 293 K / Instrument: FEI VITROBOT MARK IV

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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: 7.0 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 105000
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Number real images: 3064 / Average exposure time: 8.0 sec. / Average electron dose: 49.6 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 2.1)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 2.1)
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Algorithm: FOURIER SPACE / Resolution.type: BY AUTHOR / Resolution: 3.86 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 2.1) / Number images used: 267457
DetailsMovie frames were aligned, dose-weighted, binned by two and averaged using Motioncor2 (Zheng S.Q Nat. Methods. 2017; 14: 331-332). Movie sums were used for contrast transfer function (CTF) estimation with Gctf (Zhang K. J. Struct. Biol. 2016; 193: 1-12)
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL / Protocol: FLEXIBLE FIT
Output model

PDB-7zf2:
Protomeric substructure from an octameric assembly of M. tuberculosis RNA polymerase in complex with sigma-b initiation factor

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