6SKO: Fork Protection Complex

Cryo-EM Structure of the Fork Protection Complex Bound to CMG at a Replication Fork - conformation 2 MCM CTD:ssDNA. Determined by electron microscopy at 3.4 Å resolution. Released 6 May 2020.

Method
Electron microscopy
Resolution
3.4 Å
Organisms
Saccharomyces cerevisiae (strain ATCC 204508 / S288c), synthetic construct
Chains
7
Atoms
15,715
Mol. weight
635.42 kDa
Ligands
ANP, MG
Released
6 May 2020

Explore 6SKO in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

6SKO contains 99 α-helices and 89 β-strands across 6 chains. Residue ranges use author residue numbering, as in the PDB file, from PDBe. To see them in 3D, choose the Cartoon representation with Secondary structure coloring: helices, sheets and coils get different colors.

Chain 2: 16 helices, 14 β-strands

ElementResiduesLengthSheet
α-helix478-48710
α-helix493-5008
α-helix509-52012
β-strand525116
β-strand533116
β-strand539-543517
α-helix549-5579
β-strand563-566417
β-strand57117
α-helix573-5775
β-strand578-582518
β-strand589-593518
β-strand603-607517
α-helix615-6239
β-strand628-631419
α-helix633-6353
β-strand638-641419
β-strand645-650617
α-helix663-6664
α-helix671-6766
β-strand679-683517
α-helix689-70517
α-helix747-7515
α-helix760-77314
β-strand777-778220
α-helix780-79920
α-helix807-82317
β-strand828-829220
α-helix831-84616
α-helix850-86516
Chain 3: 18 helices, 14 β-strands
ElementResiduesLengthSheet
α-helix344-35411
α-helix359-3668
α-helix375-38612
β-strand391-392226
β-strand398-399226
β-strand405-409527
α-helix415-4228
β-strand429-433527
β-strand437124
α-helix439-4424
β-strand444-447428
β-strand456-459428
β-strand469-473527
α-helix475-4773
α-helix480-49213
β-strand494-499612
β-strand502-507612
β-strand511-516627
α-helix529-5324
α-helix537-5404
β-strand545-549527
α-helix555-56814
α-helix580-5823
α-helix653-66614
α-helix6691
β-strand670-671229
α-helix6721
α-helix673-68816
α-helix692-6932
α-helix699-71517
β-strand720-721229
α-helix723-73715
Chain 4: 19 helices, 16 β-strands
ElementResiduesLengthSheet
α-helix503-51311
α-helix518-5269
α-helix534-54512
β-strand550-551230
β-strand557-558230
β-strand564-568531
α-helix574-58411
β-strand588-592531
β-strand596114
α-helix598-6014
β-strand603-606432
β-strand615-618432
α-helix622-6243
β-strand628-632531
α-helix634-6363
α-helix639-6424
α-helix645-6506
β-strand653-65754
β-strand662-66654
β-strand670-675631
α-helix688-6925
α-helix696-6994
β-strand704-708531
α-helix714-72411
α-helix725-7295
α-helix744-75714
α-helix7601
β-strand761-762233
α-helix7631
α-helix764-77815
α-helix795-81117
β-strand816-817233
α-helix819-83214
β-strand838134
β-strand845134
Chain 5: 12 helices, 13 β-strands
ElementResiduesLengthSheet
α-helix351-36212
α-helix366-3716
α-helix382-39312
β-strand398-399221
β-strand405-406221
β-strand411-414422
α-helix423-43210
β-strand436-438322
β-strand451-454423
β-strand463-466423
α-helix468-4714
β-strand474-479622
α-helix491-4999
β-strand501-506624
β-strand509-514624
β-strand517-522622
α-helix545-5473
β-strand552-554322
α-helix563-57614
α-helix596-60914
β-strand613-614225
α-helix616-63520
α-helix650-66516
β-strand671-672225
α-helix674-68512
Chain 6: 16 helices, 18 β-strands
ElementResiduesLengthSheet
α-helix501-5077
α-helix510-52112
α-helix525-5328
α-helix541-55212
β-strand557-55821
β-strand564-56521
β-strand571-57552
α-helix581-5899
β-strand59612
β-strand59913
β-strand60314
β-strand610-61455
β-strand621-62555
β-strand635-63842
β-strand63913
α-helix641-6433
α-helix646-6538
β-strand661-66336
β-strand66417
β-strand670-67236
β-strand677-68262
α-helix683-6842
α-helix695-6984
β-strand69918
α-helix703-7075
β-strand711-71552
α-helix721-73717
α-helix738-7403
α-helix748-75811
β-strand764-76529
α-helix767-78216
α-helix798-81316
β-strand818-81929
α-helix821-83414
Chain 7: 18 helices, 14 β-strands
ElementResiduesLengthSheet
α-helix395-40713
α-helix410-4178
α-helix426-43712
β-strand442-443210
β-strand449-450210
α-helix453-4553
β-strand456-460511
α-helix467-47610
β-strand481-484411
β-strand488112
α-helix490-4945
β-strand495-498413
β-strand507-510413
α-helix512-5154
β-strand519-524611
α-helix526-5283
α-helix531-5344
α-helix538-5414
β-strand546-550514
β-strand553-557514
β-strand561-567711
α-helix580-5845
α-helix588-5914
β-strand596-600511
α-helix606-62116
α-helix635-64511
β-strand651115
α-helix654-67320
α-helix677-6793
α-helix686-70217
β-strand707115
α-helix710-72819

Molecules and chains

MoleculeChainsTypeLengthOrganismUniProt
DNA replication licensing factor MCM66protein1017Saccharomyces cerevisiae (strain ATCC 204508 / S288c)P53091 (AlphaFold model)
DNA replication licensing factor MCM77protein845Saccharomyces cerevisiae (strain ATCC 204508 / S288c)P38132 (AlphaFold model)
DNA replication licensing factor MCM22protein868Saccharomyces cerevisiae (strain ATCC 204508 / S288c)P29469 (AlphaFold model)
Minichromosome maintenance protein 55protein775Saccharomyces cerevisiae (strain ATCC 204508 / S288c)P29496 (AlphaFold model)
DNA replication licensing factor MCM33protein971Saccharomyces cerevisiae (strain ATCC 204508 / S288c)P24279
DNA replication licensing factor MCM44protein933Saccharomyces cerevisiae (strain ATCC 204508 / S288c)P30665
ssDNA, leading-strand templateIDNA85synthetic construct
Sequence of entity 1 (6), FASTA
>6SKO_1 DNA replication licensing factor MCM6 (chains 6)
MSSPFPADTPSSNRPSNSSPPPSSIGAGFGSSSGLDSQIGSRLHFPSSSQPHVSNSQTGP
FVNDSTQFSSQRLQTDGSATNDMEGNEPARSFKSRALNHVKKVDDVTGEKVREAFEQFLE
DFSVQSTDTGEVEKVYRAQIEFMKIYDLNTIYIDYQHLSMRENGALAMAISEQYYRFLPF
LQKGLRRVVRKYAPELLNTSDSLKRSEGDEGQADEDEQQDDDMNGSSLPRDSGSSAAPGN
GTSAMATRSITTSTSPEQTERVFQISFFNLPTVHRIRDIRSEKIGSLLSISGTVTRTSEV
RPELYKASFTCDMCRAIVDNVEQSFKYTEPTFCPNPSCENRAFWTLNVTRSRFLDWQKVR
IQENANEIPTGSMPRTLDVILRGDSVERAKPGDRCKFTGVEIVVPDVTQLGLPGVKPSST
LDTRGISKTTEGLNSGVTGLRSLGVRDLTYKISFLACHVISIGSNIGASSPDANSNNRET
ELQMAANLQANNVYQDNERDQEVFLNSLSSDEINELKEMVKDEHIYDKLVRSIAPAVFGH
EAVKKGILLQMLGGVHKSTVEGIKLRGDINICVVGDPSTSKSQFLKYVVGFAPRSVYTSG
KASSAAGLTAAVVRDEEGGDYTIEAGALMLADNGICCIDEFDKMDISDQVAIHEAMEQQT
ISIAKAGIHATLNARTSILAAANPVGGRYNRKLSLRGNLNMTAPIMSRFDLFFVILDDCN
EKIDTELASHIVDLHMKRDEAIEPPFSAEQLRRYIKYARTFKPILTKEARSYLVEKYKEL
RKDDAQGFSRSSYRITVRQLESMIRLSEAIARANCVDEITPSFIAEAYDLLRQSIIRVDV
DDVEMDEEFDNIESQSHAASGNNDDNDDGTGSGVITSEPPADIEEGQSEATARPGTSEKK
KTTVTYDKYVSMMNMIVRKIAEVDREGAEELTAVDIVDWYLLQKENDLGSLAEYWEERRL
AFKVIKRLVKDRILMEIHGTRHNLRDLENEENENNKTVYVIHPNCEVLDQLEPQDSS
Sequence of entity 2 (7), FASTA
>6SKO_2 DNA replication licensing factor MCM7 (chains 7)
MSAALPSIQLPVDYNNLFNEITDFLVTFKQDTLSSDATRNENEDENLDAENIEQHLLEKG
PKYMAMLQKVANRELNSVIIDLDDILQYQNEKFLQGTQADDLVSAIQQNANHFTELFCRA
IDNNMPLPTKEIDYKDDVLDVILNQRRLRNERMLSDRTNEIRSENLMDTTMDPPSSMNDA
LREVVEDETELFPPNLTRRYFLYFKPLSQNCARRYRKKAISSKPLSVRQIKGDFLGQLIT
VRGIITRVSDVKPAVEVIAYTCDQCGYEVFQEVNSRTFTPLSECTSEECSQNQTKGQLFM
STRASKFSAFQECKIQELSQQVPVGHIPRSLNIHVNGTLVRSLSPGDIVDVTGIFLPAPY
TGFKALKAGLLTETYLEAQFVRQHKKKFASFSLTSDVEERVMELITSGDVYNRLAKSIAP
EIYGNLDVKKALLLLLVGGVDKRVGDGMKIRGDINVCLMGDPGVAKSQLLKAICKISPRG
VYTTGKGSSGVGLTAAVMKDPVTDEMILEGGALVLADNGICCIDEFDKMDESDRTAIHEV
MEQQTISISKAGINTTLNARTSILAAANPLYGRYNPRLSPLDNINLPAALLSRFDILFLM
LDIPSRDDDEKLAEHVTYVHMHNKQPDLDFTPVEPSKMREYIAYAKTKRPVMSEAVNDYV
VQAYIRLRQDSKREMDSKFSFGQATPRTLLGIIRLSQALAKLRLADMVDIDDVEEALRLV
RVSKESLYQETNKSKEDESPTTKIFTIIKKMLQETGKNTLSYENIVKTVRLRGFTMLQLS
NCIQEYSYLNVWHLINEGNTLKFVDDGTMDTDQEDSLVSTPKLAPQTTASANVSAQDSDI
DLQDA
Sequence of entity 3 (2), FASTA
>6SKO_3 DNA replication licensing factor MCM2 (chains 2)
MSDNRRRRREEDDSDSENELPPSSPQQHFRGGMNPVSSPIGSPDMINPEGDDNEVDDVPD
IDEVEEQMNEVDLMDDNMYEDYAADHNRDRYDPDQVDDREQQELSLSERRRIDAQLNERD
RLLRNVAYIDDEDEEQEGAAQLDEMGLPVQRRRRRRQYEDLENSDDDLLSDMDIDPLREE
LTLESLSNVKANSYSEWITQPNVSRTIARELKSFLLEYTDETGRSVYGARIRTLGEMNSE
SLEVNYRHLAESKAILALFLAKCPEEMLKIFDLVAMEATELHYPDYARIHSEIHVRISDF
PTIYSLRELRESNLSSLVRVTGVVTRRTGVFPQLKYVKFNCLKCGSILGPFFQDSNEEIR
ISFCTNCKSKGPFRVNGEKTVYRNYQRVTLQEAPGTVPPGRLPRHREVILLADLVDVSKP
GEEVEVTGIYKNNYDGNLNAKNGFPVFATIIEANSIKRREGNTANEGEEGLDVFSWTEEE
EREFRKISRDRGIIDKIISSMAPSIYGHRDIKTAVACSLFGGVPKNVNGKHSIRGDINVL
LLGDPGTAKSQILKYVEKTAHRAVFATGQGASAVGLTASVRKDPITKEWTLEGGALVLAD
KGVCLIDEFDKMNDQDRTSIHEAMEQQSISISKAGIVTTLQARCSIIAAANPNGGRYNST
LPLAQNVSLTEPILSRFDILCVVRDLVDEEADERLATFVVDSHVRSHPENDEDREGEELK
NNGESAIEQGEDEINEQLNARQRRLQRQRKKEEEISPIPQELLMKYIHYARTKIYPKLHQ
MDMDKVSRVYADLRRESISTGSFPITVRHLESILRIAESFAKMRLSEFVSSYDLDRAIKV
VVDSFVDAQKVSVRRQLRRSFAIYTLGH
Sequence of entity 4 (5), FASTA
>6SKO_4 Minichromosome maintenance protein 5 (chains 5)
MSFDRPEIYSAPVLQGESPNDDDNTEIIKSFKNFILEFRLDSQFIYRDQLRNNILVKNYS
LTVNMEHLIGYNEDIYKKLSDEPSDIIPLFETAITQVAKRISILSRAQSANNNDKDPENT
SMDTDSLLLNSLPTFQLILNSNANQIPLRDLDSEHVSKIVRLSGIIISTSVLSSRATYLS
IMCRNCRHTTSITINNFNSITGNTVSLPRSCLSTIESESSMANESNIGDESTKKNCGPDP
YIIIHESSKFIDQQFLKLQEIPELVPVGEMPRNLTMTCDRYLTNKVIPGTRVTIVGIYSI
YNSKNGAGSGRSGGGNGGSGVAIRTPYIKILGIQSDVETSSIWNSVTMFTEEEEEEFLQL
SRNPKLYEILTNSIAPSIFGNEDIKKAIVCLLMGGSKKILPDGMRLRGDINVLLLGDPGT
AKSQLLKFVEKVSPIAVYTSGKGSSAAGLTASVQRDPMTREFYLEGGAMVLADGGVVCID
EFDKMRDEDRVAIHEAMEQQTISIAKAGITTVLNSRTSVLAAANPIYGRYDDLKSPGDNI
DFQTTILSRFDMIFIVKDDHNEERDISIANHVINIHTGNANAMQNQQEENGSEISIEKMK
RYITYCRLKCAPRLSPQAAEKLSSNFVTIRKQLLINELESTERSSIPITIRQLEAIIRIT
ESLAKLELSPIAQERHVDEAIRLFQASTMDAASQDPIGGLNQASGTSLSEIRRFEQELKR
RLPIGWSTSYQTLRREFVDTHRFSQLALDKALYALEKHETIQLRHQGQNIYRSGV
Sequence of entity 5 (3), FASTA
>6SKO_5 DNA replication licensing factor MCM3 (chains 3)
MEGSTGFDGDATTFFAPDAVFGDRVRRFQEFLDTFTSYRDSVRSIQVYNSNNAANYNDDQ
DDADERDLLGDDDGDDLEKEKKAASSTSLNILPHRIIISLDDLREFDRSFWSGILVEPAY
FIPPAEKALTDLADSMDDVPHPNASAVSSRHPWKLSFKGSFGAHALSPRTLTAQHLNKLV
SVEGIVTKTSLVRPKLIRSVHYAAKTGRFHYRDYTDATTTLTTRIPTPAIYPTEDTEGNK
LTTEYGYSTFIDHQRITVQEMPEMAPAGQLPRSIDVILDDDLVDKTKPGDRVNVVGVFKS
LGAGGMNQSNSNTLIGFKTLILGNTVYPLHARSTGVAARQMLTDFDIRNINKLSKKKDIF
DILSQSLAPSIYGHDHIKKAILLMLMGGVEKNLENGSHLRGDINILMVGDPSTAKSQLLR
FVLNTASLAIATTGRGSSGVGLTAAVTTDRETGERRLEAGAMVLADRGVVCIDEFDKMTD
VDRVAIHEVMEQQTVTIAKAGIHTTLNARCSVIAAANPVFGQYDVNRDPHQNIALPDSLL
SRFDLLFVVTDDINEIRDRSISEHVLRTHRYLPPGYLEGEPVRERLNLSLAVGEDADINP
EEHSNSGAGVENEGEDDEDHVFEKFNPLLQAGAKLAKNKGNYNGTEIPKLVTIPFLRKYV
QYAKERVIPQLTQEAINVIVKNYTDLRNDDNTKKSPITARTLETLIRLATAHAKVRLSKT
VNKVDAKVAANLLRFALLGEDIGNDIDEEESEYEEALSKRSPQKSPKKRQRVRQPASNSG
SPIKSTPRRSTASSVNATPSSARRILRFQDDEQNAGEDDNDIMSPLPADEEAELQRRLQL
GLRVSPRRREHLHAPEEGSSGPLTEVGTPRLPNVSSAGQDDEQQQSVISFDNVEPGTIST
GRLSLISGIIARLMQTEIFEEESYPVASLFERINEELPEEEKFSAQEYLAGLKIMSDRNN
LMVADDKVWRV
Sequence of entity 6 (4), FASTA
>6SKO_6 DNA replication licensing factor MCM4 (chains 4)
MSQQSSSPTKEDNNSSSPVVPNPDSVPPQLSSPALFYSSSSSQGDIYGRNNSQNLSQGEG
NIRAAIGSSPLNFPSSSQRQNSDVFQSQGRQGRIRSSASASGRSRYHSDLRSDRALPTSS
SSLGRNGQNRVHMRRNDIHTSDLSSPRRIVDFDTRSGVNTLDTSSSSAPPSEASEPLRII
WGTNVSIQECTTNFRNFLMSFKYKFRKILDEREEFINNTTDEELYYIKQLNEMRELGTSN
LNLDARNLLAYKQTEDLYHQLLNYPQEVISIMDQTIKDCMVSLIVDNNLDYDLDEIETKF
YKVRPYNVGSCKGMRELNPNDIDKLINLKGLVLRSTPVIPDMKVAFFKCNVCDHTMAVEI
DRGVIQEPARCERIDCNEPNSMSLIHNRCSFADKQVIKLQETPDFVPDGQTPHSISLCVY
DELVDSCRAGDRIEVTGTFRSIPIRANSRQRVLKSLYKTYVDVVHVKKVSDKRLDVDTST
IEQELMQNKVDHNEVEEVRQITDQDLAKIREVAAREDLYSLLARSIAPSIYELEDVKKGI
LLQLFGGTNKTFTKGGRYRGDINILLCGDPSTSKSQILQYVHKITPRGVYTSGKGSSAVG
LTAYITRDVDTKQLVLESGALVLSDGGVCCIDEFDKMSDSTRSVLHEVMEQQTISIAKAG
IITTLNARSSILASANPIGSRYNPNLPVTENIDLPPPLLSRFDLVYLVLDKVDEKNDREL
AKHLTNLYLEDKPEHISQDDVLPVEFLTMYISYAKEHIHPIITEAAKTELVRAYVGMRKM
GDDSRSDEKRITATTRQLESMIRLAEAHAKMKLKNVVELEDVQEAVRLIRSAIKDYATDP
KTGKIDMNLVQTGKSVIQRKLQEDLSREIMNVLKDQASDSMSFNELIKQINEHSQDRVES
SDIQEALSRLQQEDKVIVLGEGVRRSVRLNNRV
Sequence of entity 7 (I), FASTA
>6SKO_7 ssDNA, leading-strand template (chains I)
TAGAGTAGGAAGTGATGGTAAGTGATTAGAGAATTGGAGAGTGTGTTTTTTTTTTTTTTT
TTTTTTTTTTTTTTTTTTTTTTTTT

Ligands and cofactors

IDNameFormulaCopies
ANPPhosphoaminophosphonic acid-adenylate esterC10 H17 N6 O12 P35
MGMagnesium ionMg5

Primary citation

Cryo-EM Structure of the Fork Protection Complex Bound to CMG at a Replication Fork. Baretic, D., Jenkyn-Bedford, M., Aria, V. et al. Mol Cell (2020) 78:926-940.e13. DOI 10.1016/j.molcel.2020.04.012 · PubMed

Other PDB entries of the same protein (UniProt P53091 (AlphaFold model), which also has an AlphaFold model), best resolution first:

Browse structure collections

About this viewer

MolViewer shows 6SKO directly in your browser with nothing to install. Switch between cartoon, ball-and-stick, spacefill and surface views, color by chain, secondary structure or B-factor, measure distances, angles and dihedrals, and share or embed the view.