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- EMDB-21405: Structure of the human clamp loader (Replication Factor C, RFC) b... -

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Entry
Database: EMDB / ID: EMD-21405
TitleStructure of the human clamp loader (Replication Factor C, RFC) bound to the sliding clamp (Proliferating Cell Nuclear Antigen, PCNA)
Map dataStructure of the human clamp loader RFC bound to the sliding clamp Proliferating Cell Nuclear Antigen (PCNA)
Sample
  • Complex: Human Replication factor C (RFC) complex bound to the sliding clamp Proliferating cell nuclear antigen (PCNA)
    • Protein or peptide: Replication factor C subunit 1
    • Protein or peptide: Replication factor C subunit 2
    • Protein or peptide: Replication factor C subunit 5
    • Protein or peptide: Replication factor C subunit 4
    • Protein or peptide: Replication factor C subunit 3
    • Protein or peptide: Proliferating cell nuclear antigen
  • Ligand: MAGNESIUM ION
  • Ligand: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER
  • Ligand: ADENOSINE-5'-DIPHOSPHATE
Keywordssliding clamp / DNA replication / AAA+ / ATPase / clamp loader / DNA BINDING PROTEIN / REPLICATION
Function / homology
Function and homology information


DNA clamp unloader activity / Elg1 RFC-like complex / DNA replication factor C complex / Ctf18 RFC-like complex / positive regulation of deoxyribonuclease activity / dinucleotide insertion or deletion binding / PCNA-p21 complex / mitotic telomere maintenance via semi-conservative replication / purine-specific mismatch base pair DNA N-glycosylase activity / DNA clamp loader activity ...DNA clamp unloader activity / Elg1 RFC-like complex / DNA replication factor C complex / Ctf18 RFC-like complex / positive regulation of deoxyribonuclease activity / dinucleotide insertion or deletion binding / PCNA-p21 complex / mitotic telomere maintenance via semi-conservative replication / purine-specific mismatch base pair DNA N-glycosylase activity / DNA clamp loader activity / nuclear lamina / positive regulation of DNA-directed DNA polymerase activity / Polymerase switching / MutLalpha complex binding / Telomere C-strand (Lagging Strand) Synthesis / Processive synthesis on the lagging strand / PCNA complex / Removal of the Flap Intermediate / Processive synthesis on the C-strand of the telomere / Polymerase switching on the C-strand of the telomere / Mismatch repair (MMR) directed by MSH2:MSH3 (MutSbeta) / Mismatch repair (MMR) directed by MSH2:MSH6 (MutSalpha) / Transcription of E2F targets under negative control by DREAM complex / Removal of the Flap Intermediate from the C-strand / replisome / response to L-glutamate / HDR through Single Strand Annealing (SSA) / DNA strand elongation involved in DNA replication / response to dexamethasone / DNA synthesis involved in DNA repair / Impaired BRCA2 binding to RAD51 / histone acetyltransferase binding / DNA polymerase processivity factor activity / G1/S-Specific Transcription / leading strand elongation / nuclear replication fork / replication fork processing / Presynaptic phase of homologous DNA pairing and strand exchange / SUMOylation of DNA replication proteins / PCNA-Dependent Long Patch Base Excision Repair / ATP-dependent activity, acting on DNA / response to cadmium ion / telomere maintenance via telomerase / translesion synthesis / estrous cycle / mismatch repair / Activation of ATR in response to replication stress / cyclin-dependent protein kinase holoenzyme complex / base-excision repair, gap-filling / DNA polymerase binding / liver regeneration / epithelial cell differentiation / positive regulation of DNA repair / TP53 Regulates Transcription of Genes Involved in G2 Cell Cycle Arrest / Translesion synthesis by REV1 / Translesion synthesis by POLK / Translesion synthesis by POLI / positive regulation of DNA replication / Gap-filling DNA repair synthesis and ligation in GG-NER / replication fork / nuclear estrogen receptor binding / male germ cell nucleus / enzyme activator activity / Termination of translesion DNA synthesis / Recognition of DNA damage by PCNA-containing replication complex / Translesion Synthesis by POLH / receptor tyrosine kinase binding / G2/M DNA damage checkpoint / HDR through Homologous Recombination (HRR) / Dual Incision in GG-NER / DNA-templated DNA replication / cellular response to xenobiotic stimulus / cellular response to hydrogen peroxide / Dual incision in TC-NER / Gap-filling DNA repair synthesis and ligation in TC-NER / cellular response to UV / response to estradiol / E3 ubiquitin ligases ubiquitinate target proteins / heart development / chromatin organization / Processing of DNA double-strand break ends / double-stranded DNA binding / Regulation of TP53 Activity through Phosphorylation / DNA-binding transcription factor binding / sequence-specific DNA binding / damaged DNA binding / chromosome, telomeric region / DNA replication / nuclear body / protein domain specific binding / DNA repair / centrosome / chromatin binding / chromatin / positive regulation of DNA-templated transcription / protein-containing complex binding / enzyme binding / negative regulation of transcription by RNA polymerase II / ATP hydrolysis activity / DNA binding
Similarity search - Function
Replication factor C subunit 1 / DNA replication factor RFC1, C-terminal / Replication factor RFC1 C terminal domain / RFC1-like, AAA+ ATPase lid domain / Replication factor C subunit 3, C-terminal domain / RCF1/5-like, AAA+ ATPase lid domain / Replication factor C, C-terminal / Replication factor C C-terminal domain / : / DNA polymerase III, delta subunit ...Replication factor C subunit 1 / DNA replication factor RFC1, C-terminal / Replication factor RFC1 C terminal domain / RFC1-like, AAA+ ATPase lid domain / Replication factor C subunit 3, C-terminal domain / RCF1/5-like, AAA+ ATPase lid domain / Replication factor C, C-terminal / Replication factor C C-terminal domain / : / DNA polymerase III, delta subunit / : / DNA polymerase III, clamp loader complex, gamma/delta/delta subunit, C-terminal / Proliferating cell nuclear antigen signature 2. / Proliferating cell nuclear antigen, PCNA, conserved site / Proliferating cell nuclear antigen signature 1. / Proliferating cell nuclear antigen, PCNA / Proliferating cell nuclear antigen, PCNA, N-terminal / Proliferating cell nuclear antigen, PCNA, C-terminal / Proliferating cell nuclear antigen, N-terminal domain / Proliferating cell nuclear antigen, C-terminal domain / BRCA1 C Terminus (BRCT) domain / : / breast cancer carboxy-terminal domain / BRCT domain profile. / BRCT domain / BRCT domain superfamily / ATPase family associated with various cellular activities (AAA) / ATPase, AAA-type, core / ATPases associated with a variety of cellular activities / AAA+ ATPase domain / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
Proliferating cell nuclear antigen / Replication factor C subunit 4 / Replication factor C subunit 2 / Replication factor C subunit 1 / Replication factor C subunit 5 / Replication factor C subunit 3
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.4 Å
AuthorsGaubitz C / Liu X
Funding support United States, Switzerland, 3 items
OrganizationGrant numberCountry
American Cancer Society440685 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01-GM127776 United States
Swiss National Science Foundation177859 Switzerland
CitationJournal: Proc Natl Acad Sci U S A / Year: 2020
Title: Structure of the human clamp loader reveals an autoinhibited conformation of a substrate-bound AAA+ switch.
Authors: Christl Gaubitz / Xingchen Liu / Joseph Magrino / Nicholas P Stone / Jacob Landeck / Mark Hedglin / Brian A Kelch /
Abstract: DNA replication requires the sliding clamp, a ring-shaped protein complex that encircles DNA, where it acts as an essential cofactor for DNA polymerases and other proteins. The sliding clamp needs to ...DNA replication requires the sliding clamp, a ring-shaped protein complex that encircles DNA, where it acts as an essential cofactor for DNA polymerases and other proteins. The sliding clamp needs to be opened and installed onto DNA by a clamp loader ATPase of the AAA+ family. The human clamp loader replication factor C (RFC) and sliding clamp proliferating cell nuclear antigen (PCNA) are both essential and play critical roles in several diseases. Despite decades of study, no structure of human RFC has been resolved. Here, we report the structure of human RFC bound to PCNA by cryogenic electron microscopy to an overall resolution of ∼3.4 Å. The active sites of RFC are fully bound to adenosine 5'-triphosphate (ATP) analogs, which is expected to induce opening of the sliding clamp. However, we observe the complex in a conformation before PCNA opening, with the clamp loader ATPase modules forming an overtwisted spiral that is incapable of binding DNA or hydrolyzing ATP. The autoinhibited conformation observed here has many similarities to a previous yeast RFC:PCNA crystal structure, suggesting that eukaryotic clamp loaders adopt a similar autoinhibited state early on in clamp loading. Our results point to a "limited change/induced fit" mechanism in which the clamp first opens, followed by DNA binding, inducing opening of the loader to release autoinhibition. The proposed change from an overtwisted to an active conformation reveals an additional regulatory mechanism for AAA+ ATPases. Finally, our structural analysis of disease mutations leads to a mechanistic explanation for the role of RFC in human health.
History
DepositionFeb 18, 2020-
Header (metadata) releaseFeb 26, 2020-
Map releaseFeb 26, 2020-
UpdateOct 16, 2024-
Current statusOct 16, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.044
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.044
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6vvo
  • Surface level: 0.044
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_21405.png

Downloads & links

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Map

FileDownload / File: emd_21405.map.gz / Format: CCP4 / Size: 52.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationStructure of the human clamp loader RFC bound to the sliding clamp Proliferating Cell Nuclear Antigen (PCNA)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 240 pix.
= 254.4 Å		1.06 Å/pix.
x 240 pix.
= 254.4 Å		1.06 Å/pix.
x 240 pix.
= 254.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.044 / Movie #1: 0.044
Minimum - Maximum-0.031003328 - 0.23912199
Average (Standard dev.)0.0012612386 (±0.00786336)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions240240240
Spacing240240240
CellA=B=C: 254.4 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.061.061.06
M x/y/z240240240
origin x/y/z0.0000.0000.000
length x/y/z254.400254.400254.400
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS240240240
D min/max/mean-0.0310.2390.001

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Supplemental data

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Sample components

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Entire : Human Replication factor C (RFC) complex bound to the sliding cla...

EntireName: Human Replication factor C (RFC) complex bound to the sliding clamp Proliferating cell nuclear antigen (PCNA)
Components
  • Complex: Human Replication factor C (RFC) complex bound to the sliding clamp Proliferating cell nuclear antigen (PCNA)
    • Protein or peptide: Replication factor C subunit 1
    • Protein or peptide: Replication factor C subunit 2
    • Protein or peptide: Replication factor C subunit 5
    • Protein or peptide: Replication factor C subunit 4
    • Protein or peptide: Replication factor C subunit 3
    • Protein or peptide: Proliferating cell nuclear antigen
  • Ligand: MAGNESIUM ION
  • Ligand: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER
  • Ligand: ADENOSINE-5'-DIPHOSPHATE

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Supramolecule #1: Human Replication factor C (RFC) complex bound to the sliding cla...

SupramoleculeName: Human Replication factor C (RFC) complex bound to the sliding clamp Proliferating cell nuclear antigen (PCNA)
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#6
Details: hRFC construct with a truncation of the A subunit's N-terminal region (missing residues 1-555)
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 310 KDa

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Macromolecule #1: Replication factor C subunit 1

MacromoleculeName: Replication factor C subunit 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 66.221227 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MDKEQVAEET SGDSKARNLA DDSSENKVEN LLWVDKYKPT SLKTIIGQQG DQSCANKLLR WLRNWQKSSS EDKKHAAKFG KFSGKDDGS SFKAALLSGP PGVGKTTTAS LVCQELGYSY VELNASDTRS KSSLKAIVAE SLNNTSIKGF YSNGAASSVS T KHALIMDE ...String:
MDKEQVAEET SGDSKARNLA DDSSENKVEN LLWVDKYKPT SLKTIIGQQG DQSCANKLLR WLRNWQKSSS EDKKHAAKFG KFSGKDDGS SFKAALLSGP PGVGKTTTAS LVCQELGYSY VELNASDTRS KSSLKAIVAE SLNNTSIKGF YSNGAASSVS T KHALIMDE VDGMAGNEDR GGIQELIGLI KHTKIPIICM CNDRNHPKIR SLVHYCFDLR FQRPRVEQIK GAMMSIAFKE GL KIPPPAM NEIILGANQD IRQVLHNLSM WCARSKALTY DQAKADSHRA KKDIKMGPFD VARKVFAAGE ETAHMSLVDK SDL FFHDYS IAPLFVQENY IHVKPVAAGG DMKKHLMLLS RAADSICDGD LVDSQIRSKQ NWSLLPAQAI YASVLPGELM RGYM TQFPT FPSWLGKHSS TGKHDRIVQD LALHMSLRTY SSKRTVNMDY LSLLRDALVQ PLTSQGVDGV QDVVALMDTY YLMKE DFEN IMEISSWGGK PSPFSKLDPK VKAAFTRAYN KEAHLTPYSL QAIKASRHST SPSLDSEYNE ELNEDDSQSD EKDQDA IET DAMIKKKTKS SKPSKPEKDK EPRKGKGKSS KK

UniProtKB: Replication factor C subunit 1

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Macromolecule #2: Replication factor C subunit 2

MacromoleculeName: Replication factor C subunit 2 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.203207 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MEVEAVCGGA GEVEAQDSDP APAFSKAPGS AGHYELPWVE KYRPVKLNEI VGNEDTVSRL EVFAREGNVP NIIIAGPPGT GKTTSILCL ARALLGPALK DAMLELNASN DRGIDVVRNK IKMFAQQKVT LPKGRHKIII LDEADSMTDG AQQALRRTME I YSKTTRFA ...String:
MEVEAVCGGA GEVEAQDSDP APAFSKAPGS AGHYELPWVE KYRPVKLNEI VGNEDTVSRL EVFAREGNVP NIIIAGPPGT GKTTSILCL ARALLGPALK DAMLELNASN DRGIDVVRNK IKMFAQQKVT LPKGRHKIII LDEADSMTDG AQQALRRTME I YSKTTRFA LACNASDKII EPIQSRCAVL RYTKLTDAQI LTRLMNVIEK ERVPYTDDGL EAIIFTAQGD MRQALNNLQS TF SGFGFIN SENVFKVCDE PHPLLVKEMI QHCVNANIDE AYKILAHLWH LGYSPEDIIG NIFRVCKTFQ MAEYLKLEFI KEI GYTHMK IAEGVNSLLQ MAGLLARLCQ KTMAPVAS

UniProtKB: Replication factor C subunit 2

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Macromolecule #3: Replication factor C subunit 5

MacromoleculeName: Replication factor C subunit 5 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 38.545512 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: METSALKQQE QPAATKIRNL PWVEKYRPQT LNDLISHQDI LSTIQKFINE DRLPHLLLYG PPGTGKTSTI LACAKQLYKD KEFGSMVLE LNASDDRGID IIRGPILSFA STRTIFKKGF KLVILDEADA MTQDAQNALR RVIEKFTENT RFCLICNYLS K IIPALQSR ...String:
METSALKQQE QPAATKIRNL PWVEKYRPQT LNDLISHQDI LSTIQKFINE DRLPHLLLYG PPGTGKTSTI LACAKQLYKD KEFGSMVLE LNASDDRGID IIRGPILSFA STRTIFKKGF KLVILDEADA MTQDAQNALR RVIEKFTENT RFCLICNYLS K IIPALQSR CTRFRFGPLT PELMVPRLEH VVEEEKVDIS EDGMKALVTL SSGDMRRALN ILQSTNMAFG KVTEETVYTC TG HPLKSDI ANILDWMLNQ DFTTAYRNIT ELKTLKGLAL HDILTEIHLF VHRVDFPSSV RIHLLTKMAD IEYRLSVGTN EKI QLSSLI AAFQVTRDLI VAEA

UniProtKB: Replication factor C subunit 5

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Macromolecule #4: Replication factor C subunit 4

MacromoleculeName: Replication factor C subunit 4 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 39.751668 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MQAFLKGTSI STKPPLTKDR GVAASAGSSG ENKKAKPVPW VEKYRPKCVD EVAFQEEVVA VLKKSLEGAD EPNLLFYGPP GTGKTSTIL AAARELFGPE LFRLRVLELN ASDERGIQVV REKVKNFAQL TVSGSRSDGK PCPPFKIVIL DEADSMTSAA Q AALRRTME ...String:
MQAFLKGTSI STKPPLTKDR GVAASAGSSG ENKKAKPVPW VEKYRPKCVD EVAFQEEVVA VLKKSLEGAD EPNLLFYGPP GTGKTSTIL AAARELFGPE LFRLRVLELN ASDERGIQVV REKVKNFAQL TVSGSRSDGK PCPPFKIVIL DEADSMTSAA Q AALRRTME KESKTTRFCL ICNYVSRIIE PLTSRCSKFR FKPLSDKIQQ QRLLDIAKKE NVKISDEGIA YLVKVSEGDL RK AITFLQS ATRLTGGKEI TEKVITDIAG VIPAEKIDGV FAACQSGSFD KLEAVVKDLI DEGHAATQLV NQLHDVVVEN NLS DKQKSI ITEKLAEVDK CLADGADEHL QLISLCATVM QQLSQNC

UniProtKB: Replication factor C subunit 4

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Macromolecule #5: Replication factor C subunit 3

MacromoleculeName: Replication factor C subunit 3 / type: protein_or_peptide / ID: 5 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 40.614332 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MSLWVDKYRP CSLGRLDYHK EQAAQLRNLV QCGDFPHLLV YGPSGAGKKT RIMCILRELY GVGVEKLRIE HQTITTPSKK KIEISTIAS NYHLEVNPSD AGNSDRVVIQ EMLKTVAQSQ QLETNSQRDF KVVLLTEVDK LTKDAQHALR RTMEKYMSTC R LILCCNST ...String:
MSLWVDKYRP CSLGRLDYHK EQAAQLRNLV QCGDFPHLLV YGPSGAGKKT RIMCILRELY GVGVEKLRIE HQTITTPSKK KIEISTIAS NYHLEVNPSD AGNSDRVVIQ EMLKTVAQSQ QLETNSQRDF KVVLLTEVDK LTKDAQHALR RTMEKYMSTC R LILCCNST SKVIPPIRSR CLAVRVPAPS IEDICHVLST VCKKEGLNLP SQLAHRLAEK SCRNLRKALL MCEACRVQQY PF TADQEIP ETDWEVYLRE TANAIVSQQT PQRLLEVRGR LYELLTHCIP PEIIMKGLLS ELLHNCDGQL KGEVAQMAAY YEH RLQLGS KAIYHLEAFV AKFMALYKKF MEDGLEGMMF

UniProtKB: Replication factor C subunit 3

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Macromolecule #6: Proliferating cell nuclear antigen

MacromoleculeName: Proliferating cell nuclear antigen / type: protein_or_peptide / ID: 6 / Number of copies: 3 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 28.795752 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MFEARLVQGS ILKKVLEALK DLINEACWDI SSSGVNLQSM DSSHVSLVQL TLRSEGFDTY RCDRNLAMGV NLTSMSKILK CAGNEDIIT LRAEDNADTL ALVFEAPNQE KVSDYEMKLM DLDVEQLGIP EQEYSCVVKM PSGEFARICR DLSHIGDAVV I SCAKDGVK ...String:
MFEARLVQGS ILKKVLEALK DLINEACWDI SSSGVNLQSM DSSHVSLVQL TLRSEGFDTY RCDRNLAMGV NLTSMSKILK CAGNEDIIT LRAEDNADTL ALVFEAPNQE KVSDYEMKLM DLDVEQLGIP EQEYSCVVKM PSGEFARICR DLSHIGDAVV I SCAKDGVK FSASGELGNG NIKLSQTSNV DKEEEAVTIE MNEPVQLTFA LRYLNFFTKA TPLSSTVTLS MSADVPLVVE YK IADMGHL KYYLAPKIED EEGS

UniProtKB: Proliferating cell nuclear antigen

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Macromolecule #7: MAGNESIUM ION

MacromoleculeName: MAGNESIUM ION / type: ligand / ID: 7 / Number of copies: 4 / Formula: MG
Molecular weightTheoretical: 24.305 Da

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Macromolecule #8: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER

MacromoleculeName: PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / type: ligand / ID: 8 / Number of copies: 4 / Formula: AGS
Molecular weightTheoretical: 523.247 Da
Chemical component information

ChemComp-AGS:
PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER / ATP-gamma-S, energy-carrying molecule analogue*YM

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Macromolecule #9: ADENOSINE-5'-DIPHOSPHATE

MacromoleculeName: ADENOSINE-5'-DIPHOSPHATE / type: ligand / ID: 9 / Number of copies: 1 / Formula: ADP
Molecular weightTheoretical: 427.201 Da
Chemical component information

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

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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: 7.5
GridModel: Quantifoil R0.6/1 / Material: GOLD / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 60 sec. / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 283.15 K

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Electron microscopy #1

Microscopy ID1
MicroscopeFEI TITAN KRIOS
Image recordingImage recording ID: 1 / Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 3695 / Average electron dose: 40.3 e/Å2 / Details: Quantifoil R2/2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Electron microscopy #1~

Microscopy ID1
MicroscopeFEI TITAN KRIOS
Image recordingImage recording ID: 2 / Film or detector model: GATAN K3 (6k x 4k) / Number grids imaged: 1 / Number real images: 7840 / Average electron dose: 45.0 e/Å2 / Details: Quantifoil R0.6/1
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Image recording ID1
Startup modelType of model: INSILICO MODEL
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.0.2)
Details: Multi-body refinement was used to generate 2 reconstructions that were combined
Number images used: 193934
Initial angle assignmentType: RANDOM ASSIGNMENT / Software - Name: cisTEM
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.0.2)

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Atomic model buiding 1

DetailsInitial local fitting was peformed using UCSF Chimera, followed by manual model adjustment, then refinement in PHENIX.
RefinementSpace: REAL / Protocol: OTHER
Output model

PDB-6vvo:
Structure of the human clamp loader (Replication Factor C, RFC) bound to the sliding clamp (Proliferating Cell Nuclear Antigen, PCNA)

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