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- EMDB-10996: Structure of Mycobacterium smegmatis HelD protein in complex with... -

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Entry
Database: EMDB / ID: EMD-10996
TitleStructure of Mycobacterium smegmatis HelD protein in complex with RNA polymerase core - State I, primary channel engaged
Map dataStructure of Mycobacterium smegmatis RNA polymerase core in complex with HelD protein (State I) halfmap 2
Sample
  • Complex: Mycobacterium smegmatis HelD protein in complex with RNA polymerase core
    • Protein or peptide: DNA-directed RNA polymerase subunit alpha
    • Protein or peptide: DNA-directed RNA polymerase subunit beta
    • Protein or peptide: DNA-directed RNA polymerase subunit beta'
    • Protein or peptide: DNA-directed RNA polymerase subunit omega
    • Protein or peptide: RNA polymerase-associated transcription factor HelD
  • Ligand: ZINC ION
  • Ligand: MAGNESIUM ION
Keywordstranscription cycle helicase-like protein RNA polymerase / TRANSCRIPTION
Function / homology
Function and homology information


DNA helicase complex / recombinational repair / 3'-5' DNA helicase activity / DNA-directed RNA polymerase complex / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity / DNA-directed RNA polymerase / protein dimerization activity / hydrolase activity / response to antibiotic ...DNA helicase complex / recombinational repair / 3'-5' DNA helicase activity / DNA-directed RNA polymerase complex / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity / DNA-directed RNA polymerase / protein dimerization activity / hydrolase activity / response to antibiotic / DNA-templated transcription / magnesium ion binding / DNA binding / zinc ion binding / ATP binding / cytosol / cytoplasm
Similarity search - Function
: / UvrD/REP helicase N-terminal domain / UvrD-like helicase, ATP-binding domain / UvrD-like DNA helicase ATP-binding domain profile. / DNA helicase, UvrD/REP type / 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 ...: / UvrD/REP helicase N-terminal domain / UvrD-like helicase, ATP-binding domain / UvrD-like DNA helicase ATP-binding domain profile. / DNA helicase, UvrD/REP type / 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 / RPB6/omega subunit-like superfamily / RNA polymerase Rpb1, clamp domain superfamily / RNA polymerase Rpb2, domain 2 superfamily / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb1, domain 3 / DNA-directed RNA polymerase, subunit beta-prime / RNA polymerase Rpb1, domain 1 / RNA polymerase Rpb1, domain 1 / RNA polymerase, alpha subunit / RNA polymerase Rpb1, domain 5 / RNA polymerase Rpb1, domain 4 / RNA polymerase Rpb1, domain 2 / RNA polymerase Rpb1, domain 5 / RNA polymerase Rpb1, domain 4 / RNA polymerase, beta subunit, protrusion / RNA polymerase beta subunit / RNA polymerase, N-terminal / RNA polymerase Rpb1, funnel domain superfamily / RNA polymerase I subunit A N-terminus / 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 / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
DNA-directed RNA polymerase subunit beta' / DNA-directed RNA polymerase subunit alpha / Superfamily protein I DNA or RNA helicase / DNA-directed RNA polymerase subunit omega / DNA-directed RNA polymerase subunit beta
Similarity search - Component
Biological speciesMycolicibacterium smegmatis MC2 155 (bacteria)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.08 Å
AuthorsKouba T / Koval T
CitationJournal: Nat Commun / Year: 2020
Title: Mycobacterial HelD is a nucleic acids-clearing factor for RNA polymerase.
Authors: Tomáš Kouba / Tomáš Koval' / Petra Sudzinová / Jiří Pospíšil / Barbora Brezovská / Jarmila Hnilicová / Hana Šanderová / Martina Janoušková / Michaela Šiková / Petr Halada / ...Authors: Tomáš Kouba / Tomáš Koval' / Petra Sudzinová / Jiří Pospíšil / Barbora Brezovská / Jarmila Hnilicová / Hana Šanderová / Martina Janoušková / Michaela Šiková / Petr Halada / Michal Sýkora / Ivan Barvík / Jiří Nováček / Mária Trundová / Jarmila Dušková / Tereza Skálová / URee Chon / Katsuhiko S Murakami / Jan Dohnálek / Libor Krásný /
Abstract: RNA synthesis is central to life, and RNA polymerase (RNAP) depends on accessory factors for recovery from stalled states and adaptation to environmental changes. Here, we investigated the mechanism ...RNA synthesis is central to life, and RNA polymerase (RNAP) depends on accessory factors for recovery from stalled states and adaptation to environmental changes. Here, we investigated the mechanism by which a helicase-like factor HelD recycles RNAP. We report a cryo-EM structure of a complex between the Mycobacterium smegmatis RNAP and HelD. The crescent-shaped HelD simultaneously penetrates deep into two RNAP channels that are responsible for nucleic acids binding and substrate delivery to the active site, thereby locking RNAP in an inactive state. We show that HelD prevents non-specific interactions between RNAP and DNA and dissociates stalled transcription elongation complexes. The liberated RNAP can either stay dormant, sequestered by HelD, or upon HelD release, restart transcription. Our results provide insights into the architecture and regulation of the highly medically-relevant mycobacterial transcription machinery and define HelD as a clearing factor that releases RNAP from nonfunctional complexes with nucleic acids.
History
DepositionMay 3, 2020-
Header (metadata) releaseNov 4, 2020-
Map releaseNov 4, 2020-
UpdateMay 22, 2024-
Current statusMay 22, 2024Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.17
  • Imaged by UCSF Chimera
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  • Surface view colored by radius
  • Surface level: 0.17
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6yxu
  • Surface level: 0.17
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_10996.png

Downloads & links

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Map

FileDownload / File: emd_10996.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationStructure of Mycobacterium smegmatis RNA polymerase core in complex with HelD protein (State I) halfmap 2
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 360 pix.
= 299.196 Å		0.83 Å/pix.
x 360 pix.
= 299.196 Å		0.83 Å/pix.
x 360 pix.
= 299.196 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.8311 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.17 / Movie #1: 0.17
Minimum - Maximum-0.21540773 - 0.69156736
Average (Standard dev.)0.0026655702 (±0.02550039)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 299.19598 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.83110.83110.8311
M x/y/z360360360
origin x/y/z0.0000.0000.000
length x/y/z299.196299.196299.196
α/β/γ90.00090.00090.000
start NX/NY/NZ1081340
NX/NY/NZ13584349
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS360360360
D min/max/mean-0.2150.6920.003

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Supplemental data

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Additional map: Structure of Mycobacterium smegmatis RNA polymerase core in...

Fileemd_10996_additional_1.map
AnnotationStructure of Mycobacterium smegmatis RNA polymerase core in complex with HelD protein (State I)
Projections & Slices
AxesZYX

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Density Histograms

Histogram

Histogram (log scale)

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Half map: Structure of Mycobacterium smegmatis RNA polymerase core in...

Fileemd_10996_half_map_1.map
AnnotationStructure of Mycobacterium smegmatis RNA polymerase core in complex with HelD protein (State I) halfmap 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Structure of Mycobacterium smegmatis RNA polymerase core in...

Fileemd_10996_half_map_2.map
AnnotationStructure of Mycobacterium smegmatis RNA polymerase core in complex with HelD protein (State I) halfmap 2
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Mycobacterium smegmatis HelD protein in complex with RNA polymera...

EntireName: Mycobacterium smegmatis HelD protein in complex with RNA polymerase core
Components
  • Complex: Mycobacterium smegmatis HelD protein in complex with RNA polymerase core
    • Protein or peptide: DNA-directed RNA polymerase subunit alpha
    • Protein or peptide: DNA-directed RNA polymerase subunit beta
    • Protein or peptide: DNA-directed RNA polymerase subunit beta'
    • Protein or peptide: DNA-directed RNA polymerase subunit omega
    • Protein or peptide: RNA polymerase-associated transcription factor HelD
  • Ligand: ZINC ION
  • Ligand: MAGNESIUM ION

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Supramolecule #1: Mycobacterium smegmatis HelD protein in complex with RNA polymera...

SupramoleculeName: Mycobacterium smegmatis HelD protein in complex with RNA polymerase core
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 444 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: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 37.959441 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MLISQRPTLS EETVAENRSR FVIEPLEPGF GYTLGNSLRR TLLSSIPGAA VTSIRIDGVL HEFTTVPGVK EDVTDIILNL KGLVVSSDD DEPVTMYLRK QGPGVVTAGD IVPPAGVTVH NPDMHIATLN DKGKLEVELV VERGRGYVPA VQNKASGAEI G RIPVDSIY ...String:
MLISQRPTLS EETVAENRSR FVIEPLEPGF GYTLGNSLRR TLLSSIPGAA VTSIRIDGVL HEFTTVPGVK EDVTDIILNL KGLVVSSDD DEPVTMYLRK QGPGVVTAGD IVPPAGVTVH NPDMHIATLN DKGKLEVELV VERGRGYVPA VQNKASGAEI G RIPVDSIY SPVLKVTYKV EATRVEQRTD FDKLIIDVET KNSISPRDAL ASAGGTLVEL FGLARELNAD SEHIEIGPSP AE ADHIASF ALPIDDLDLT VRSYNCLKRE GVHTVGELVA RTESDLLDIR NFGQKSIDEV KIKLHQLGLS LKDSPATFDP SEV AGYDAA TGTWTSDAGY DLDDNQDYAE TEQL

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: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 128.680141 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MLEGCILAVS SQSKSNAITN NSVPGAPNRV SFAKLREPLE VPGLLDVQTD SFEWLVGSDR WRQAAIDRGE ENPVGGLEEV LAELSPIED FSGSMSLSFS DPRFDEVKAS VDECKDKDMT YAAPLFVTAE FINNNTGEIK SQTVFMGDFP MMTEKGTFII N GTERVVVS ...String:
MLEGCILAVS SQSKSNAITN NSVPGAPNRV SFAKLREPLE VPGLLDVQTD SFEWLVGSDR WRQAAIDRGE ENPVGGLEEV LAELSPIED FSGSMSLSFS DPRFDEVKAS VDECKDKDMT YAAPLFVTAE FINNNTGEIK SQTVFMGDFP MMTEKGTFII N GTERVVVS QLVRSPGVYF DETIDKSTEK TLHSVKVIPG RGAWLEFDVD KRDTVGVRID RKRRQPVTVL LKALGWTNEQ IV ERFGFSE IMMGTLEKDT TSGTDEALLD IYRKLRPGEP PTKESAQTLL ENLFFKEKRY DLARVGRYKV NKKLGLNAGK PIT SSTLTE EDVVATIEYL VRLHEGQTSM TVPGGVEVPV EVDDIDHFGN RRLRTVGELI QNQIRVGLSR MERVVRERMT TQDV EAITP QTLINIRPVV AAIKEFFGTS QLSQFMDQNN PLSGLTHKRR LSALGPGGLS RERAGLEVRD VHPSHYGRMC PIETP EGPN IGLIGSLSVY ARVNPFGFIE TPYRKVENGV VTDQIDYLTA DEEDRHVVAQ ANSPTDENGR FTEDRVMVRK KGGEVE FVS ADQVDYMDVS PRQMVSVATA MIPFLEHDDA NRALMGANMQ RQAVPLVRSE APLVGTGMEL RAAIDAGDVV VADKTGV IE EVSADYITVM ADDGTRQSYR LRKFARSNHG TCANQRPIVD AGQRVEAGQV IADGPCTQNG EMALGKNLLV AIMPWEGH N YEDAIILSNR LVEEDVLTSI HIEEHEIDAR DTKLGAEEIT RDIPNVSDEV LADLDERGIV RIGAEVRDGD ILVGKVTPK GETELTPEER LLRAIFGEKA REVRDTSLKV PHGESGKVIG IRVFSREDDD ELPAGVNELV RVYVAQKRKI SDGDKLAGRH GNKGVIGKI LPVEDMPFLP DGTPVDIILN THGVPRRMNI GQILETHLGW VAKAGWNIDV AAGVPDWASK LPEELYSAPA D STVATPVF DGAQEGELAG LLGSTLPNRD GEVMVDADGK STLFDGRSGE PFPYPVTVGY MYILKLHHLV DDKIHARSTG PY SMITQQP LGGKAQFGGQ RFGEMECWAM QAYGAAYTLQ ELLTIKSDDT VGRVKVYEAI VKGENIPEPG IPESFKVLLK ELQ SLCLNV EVLSSDGAAI EMRDGDDEDL ERAAANLGIN LSRNESASVE DLA

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: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 146.712891 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MLDVNFFDEL RIGLATADDI RNWSYGEVKK PETINYRTLK PEKDGLFCEK IFGPTRDWEC YCGKYKRVRF KGIICERCGV EVTRAKVRR ERMGHIELAA PVTHIWYFKG VPSRLGYLLD LAPKDLEKII YFAAYVITSV DDEMRHNELS TLEAEMAVEK K AVEDQRDA ...String:
MLDVNFFDEL RIGLATADDI RNWSYGEVKK PETINYRTLK PEKDGLFCEK IFGPTRDWEC YCGKYKRVRF KGIICERCGV EVTRAKVRR ERMGHIELAA PVTHIWYFKG VPSRLGYLLD LAPKDLEKII YFAAYVITSV DDEMRHNELS TLEAEMAVEK K AVEDQRDA DLEARAQKLE ADLAELEAEG AKSDVRRKVR DSGEREMRQL RDRAQRELDR LDEIWNTFTK LAPKQLIVDE VL YRELQDR YGEYFTGAMG AESIKKLIEN FDIDAEAESL REVIRSGKGQ KKLRALKRLK VVAAFQQSGN SPMGMVLDAV PVI PPELRP MVQLDGGRFA TSDLNDLYRR VINRNNRLKR LIDLGAPEII VNNEKRMLQE SVDALFDNGR RGRPVTGPGN RPLK SLSDL LKGKQGRFRQ NLLGKRVDYS GRSVIVVGPQ LKLHQCGLPK LMALELFKPF VMKRLVDLNH AQNIKSAKRM VERQR PQVW DVLEEVIAEH PVLLNRAPTL HRLGIQAFEP QLVEGKAIQL HPLVCEAFNA DFDGDQMAVH LPLSAEAQAE ARILML SSN NILSPASGKP LAMPRLDMVT GLYYLTTLVE GATGEYQAAT KDAPEQGVYS SPAEAIMAMD RGALSVRAKI KVRLTEL RP PTDLEAQLFE NGWKPGDAWT AETTLGRVMF NELLPKSYPF VNEQMHKKVQ ARIINDLAER FPMIVVAQTV DKLKDAGF Y WATRSGVTVS MADVLVPPQK QEILERHEAE ADAIERKYQR GALNHTERNE SLVKIWQDAT EEVGKALEEF YPADNPIIT IVKSGATGNL TQTRTLAGMK GLVTNPKGEF IPRPIKSSFR EGLTVLEYFI NTHGARKGLA DTALRTADSG YLTRRLVDVS QDVIVREHD CETERGINVT LAERGPDGTL IRDAHVETSA FARTLATDAV DANGNVIIER GHDLGDPAID ALLAAGITTV K VRSVLTCT SATGVCAMCY GRSMATGKLV DIGEAVGIVA AQSIGEPGTQ LTMRTFHQGG VTGGADIVGG LPRVQELFEA RV PRNKAPI ADVAGRVRLE ESDKFFKITI VPDDGGEEVV YDKLSKRQRL RVITHEDGTE GVLSDGDHVE VGDQLMEGAA DPH EVLRVQ GPREVQIHLV KEVQEVYRAQ GVSIHDKHIE VIVRQMLRRV TIIDSGSTEF LPGSLTERAE FEAENRRVVA EGGE PAAGR PVLMGITKAS LATDSWLSAA SFQETTRVLT DAAINCRSDK LNGLKENVII GKLIPAGTGI SRYRNIQVQP TEEAR AAAY TIPSYEDQYY SPDFGQATGA AVPLDDYGYS DYR

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: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 11.544763 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MSTPHADAQL NAADDLGIDS SAASAYDTPL GITNPPIDEL LSRASSKYAL VIYAAKRARQ INDYYNQLGD GILEYVGPLV EPGLQEKPL SIALREIHGD LLEHTEGE

UniProtKB: DNA-directed RNA polymerase subunit omega

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Macromolecule #5: RNA polymerase-associated transcription factor HelD

MacromoleculeName: RNA polymerase-associated transcription factor HelD / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO / EC number: DNA helicase
Source (natural)Organism: Mycolicibacterium smegmatis MC2 155 (bacteria)
Molecular weightTheoretical: 81.298078 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSGRDYEDEL QSERDYVAGL YARLDAERAQ SQRRYAAALR EHGGTAVERD AEVRALAKDI ARLNVADNGL CFGRLDTLDD ARLYIGRLG IFDRDNDFEP LLLDWRAPMA RPFYVATAAN PENMRRRRQF HTLGRKVVDF TDEILGRPTG AEHDATNDAA L LAAVNAPR ...String:
MSGRDYEDEL QSERDYVAGL YARLDAERAQ SQRRYAAALR EHGGTAVERD AEVRALAKDI ARLNVADNGL CFGRLDTLDD ARLYIGRLG IFDRDNDFEP LLLDWRAPMA RPFYVATAAN PENMRRRRQF HTLGRKVVDF TDEILGRPTG AEHDATNDAA L LAAVNAPR GEGMRDIVAT IQAEQDQVIR LDHTGVLVIE GGPGTGKTVV ALHRVAYLLY TYRKQMERHG VLVVGPTPAF LD HIGRVLP SLGESDAVFM TPGDFVPGLH VTAEDTPEAA EVKGSLKILD VLKAAVADRQ ELPSEPIPID LSDVTMRIDA ETA KWARDE ARKTGLPHNE ARAEFVDVVT YVVTERAVAR IGRGWLTRDD KHAWEKMRAD VVGELEDHEQ FNAALDALWP ILTP EDVLA QLYTSHERLR AAGAPECLWR ADGEAWTVSD VPLLDELVDL LGRNKAADEA AERERREEEA YAAGVLDLMV DREDL MDDE DHLLAQDLID AEELADRFKE QDNRELSERA AADREWTYGH VVVDEAQELS EMDWRLLMRR CPRRSFTIVG DLAQRR SPA GARSWGAMLD SYVPGRWVYK SLSVNYRTPA EIMAVAAAVL AEFAPDATPP DSVRACGVAP WARQVTDDDI ASAIAEF VS EEAGREGTSV VIGPPDVPGT VPPSETKGLE FDAVLVVEPE RILADGPRGA AELYVALTRA TQRLGVLYRD ALPQALAG L AEGDAAATVE QRTSA

UniProtKB: Superfamily protein I DNA or RNA helicase

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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

BufferpH: 7.8
GridModel: Quantifoil R2/1 / Material: GOLD / Mesh: 300 / Pretreatment - Type: PLASMA CLEANING
VitrificationCryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

6f6w

Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.08 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1) / Number images used: 185400
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION
Final 3D classificationSoftware - Name: RELION
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
PDB IDChain

6f6w

source_name: PDB, initial_model_type: experimental model

6vsx

source_name: PDB, initial_model_type: experimental model
RefinementProtocol: AB INITIO MODEL
Output model

PDB-6yxu:
Structure of Mycobacterium smegmatis HelD protein in complex with RNA polymerase core - State I, primary channel engaged

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