8SUP: PDB entry 8SUP

Structure of the 48S translation initiation complex assembled on the encephalomyocarditis virus IRES. Determined by electron microscopy at 3.1 Å resolution. Released 18 Mar 2026.

Method
Electron microscopy
Resolution
3.1 Å
Organisms
Oryctolagus cuniculus, Encephalomyocarditis virus, Homo sapiens
Chains
47
Atoms
106,317
Mol. weight
1893.88 kDa
Ligands
ZN
Released
18 Mar 2026

Explore 8SUP in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

8SUP contains 393 α-helices and 271 β-strands across 44 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 a: 5 helices, 6 β-strands

ElementResiduesLengthSheet
β-strand47134
β-strand50112
α-helix52-6110
α-helix62-643
β-strand68135
α-helix70-767
β-strand79134
α-helix81-9414
β-strand97-101535
β-strand108-111435
α-helix112-1132
Chain A: 2 helices, 6 β-strands
ElementResiduesLengthSheet
β-strand35-42833
β-strand46-50533
β-strand57-60433
α-helix64-674
β-strand76-78333
β-strand80-81233
β-strand88-90333
α-helix98-1069
Chain b: 5 helices, 5 β-strands
ElementResiduesLengthSheet
β-strand20-22338
β-strand29-31338
β-strand36-43839
α-helix50-567
β-strand57183
α-helix62-654
β-strand66-73839
α-helix75-806
α-helix91-933
α-helix97-993
Chain B: 13 helices, 8 β-strands
ElementResiduesLengthSheet
α-helix6-83
α-helix13-219
β-strand25136
α-helix32-343
β-strand38-42536
β-strand46-49436
α-helix51-6616
α-helix71-733
β-strand74-78537
α-helix81-833
α-helix84-9411
α-helix961
β-strand97-100437
α-helix103-1042
β-strand121-124437
α-helix131-1399
β-strand144-149637
β-strand159-163537
α-helix168-18619
α-helix204-2063
α-helix207-21610
Chain c: 2 helices, 8 β-strands
ElementResiduesLengthSheet
α-helix12-176
β-strand32-36543
β-strand43-47543
β-strand55144
β-strand62144
β-strand64-65245
β-strand72-73245
α-helix741
β-strand78143
β-strand81143
Chain C: 9 helices, 13 β-strands
ElementResiduesLengthSheet
α-helix24-274
β-strand28-34740
β-strand43-50840
α-helix51-522
β-strand53141
β-strand56141
α-helix58-636
β-strand66-70540
α-helix71-744
β-strand82-911040
β-strand95-1051140
α-helix107-1137
β-strand120-128940
β-strand134-142940
β-strand143142
α-helix158-17720
α-helix181-1888
α-helix192-1998
β-strand207142
β-strand211140
β-strand215-219540
α-helix225-2328
Chain d: 1 helix, 4 β-strands
ElementResiduesLengthSheet
β-strand10-211250
β-strand27-34850
β-strand41-47750
β-strand55-58450
α-helix63-653
Chain D: 9 helices, 11 β-strands
ElementResiduesLengthSheet
α-helix65-717
α-helix78-847
α-helix91-977
β-strand103-1151346
β-strand120-1311246
β-strand137147
β-strand140-144546
α-helix147-16014
β-strand163147
β-strand168148
β-strand179148
β-strand184-188549
β-strand191-196649
β-strand204-205249
α-helix208-2158
β-strand222-227649
α-helix233-24513
α-helix253-2553
α-helix265-2684
α-helix270-2767

36 more chain groups are not listed. Open the entry in the viewer and use the sequence panel to see them.

Molecules and chains

MoleculeChainsTypeLengthOrganismUniProt
Eukaryotic translation initiation factor 3 subunit Aoprotein1362Oryctolagus cuniculusG1SMZ5
Eukaryotic translation initiation factor 3 subunit Cpprotein843Oryctolagus cuniculusA0A5F9CMJ3 (AlphaFold model)
Eukaryotic translation initiation factor 3 subunit Eqprotein445Oryctolagus cuniculusG1SUC8 (AlphaFold model)
Eukaryotic translation initiation factor 3 subunit Frprotein364Oryctolagus cuniculusG1SLC2 (AlphaFold model)
Eukaryotic translation initiation factor 3 subunit Hsprotein352Oryctolagus cuniculusG1ST95
Eukaryotic translation initiation factor 3 subunit Ktprotein218Oryctolagus cuniculusG1T3L2
Eukaryotic translation initiation factor 3 subunit Luprotein564Oryctolagus cuniculusG1SED9
Eukaryotic translation initiation factor 3 subunit Mvprotein374Oryctolagus cuniculusG1SLW8
18S rRNA2RNA1870Oryctolagus cuniculus
Emcv mRNA3RNA89Encephalomyocarditis virus
Eukaryotic translation initiation factor 1A, X-chromosomalAprotein144Homo sapiensP47813
uS2 (SA)Bprotein295Oryctolagus cuniculusG1TLT8

35 more molecules are not listed.

Sequence of entity 1 (o), FASTA
>8SUP_1 Eukaryotic translation initiation factor 3 subunit A (chains o)
MPAYFQRPENALKRANEFLEVGKKQPALDVLYDVMKSKKHRTWQKIHEPIMLKYLELCVD
LRKSHLAKEGLYQYKNICQQVNIKSLEDVVRAYLKLAEEKTEAAKEESQQMVLDIEDLDN
IQTPESVLLSAVSGEDTQDRTDRLLLTPWVKFLWESYRQCLDLLRNNSRVERLYHDIAQQ
AFKFCLQYTRKAEFRKLCDNLRMHLSQIQRHHNQSTAINLNNPESQSMHLETRLVQLDSA
ISMELWQEAFKAVEDIHGLFSLSKKPPKPQLMANYYNKVSTVFWKSGNALFHASTLHRLY
HLSREMRKNLTQDEMQRMSTRVLLATLSIPITPERTDIARLLDMDGIIVEKQRRLATLLG
LQAPPTRIGLINDMVRFNVLQYVVPEVKDLYNWLEVEFNPLKLCERVTKVLNWVREQPEK
EPELQQYVPQLQSNTILRLLQQVAQIYQSIEFSRLTSLVPFVDAFQLERAIVDAARHCDL
QVRIDHTSRTLSFGSDLNYATREDAPIGPHLQSMPSEQIRNQLTAMSSVLAKALEVIKPA
HILQEKEEQHQLAVTAYLKNSRKEHQRILARRQTIEERKERLESLNIQREKEELEQREAE
LQKVRKAEEERLRQEAKEREKERILQEHEQIKKKTVRERLEQIKKTELGAKAFKDIDIED
LEELDPDFIMAKQVEQLEKEKKELQERLKNQEKKIDYFERAKRLEEIPLIKSAYEEQRIK
DMDLWEQQEEERITTMQLEREKALEHKNRMSRMLEDRDLFVMRLKAARQSVYEEKLKQFE
ERLAEERHNRLEERKRQRKEERRITYYREKEEEEQRRAEEQMLKEREERERAERAKREEE
LREYQERVKKLEEVERKKRQRELEIEERERRREEERRLGEDPLSRRDSRWGDRDSEGTWR
KGPEADSEWRRGPPEKEWRRGEGRDDERSHRRDEERPRRVGDDEDRESSLRPDDDRTLRR
GMEDDRGPRRGPDEERFSRRGLEDERPSWRSTDDDRPPRRIGEEDRGSWRHAEDDRPPRR
GLDDDRGSWRTADEDRGPRRMMDEDRGPRRGGADDERPSWRSADDDRGPRRGIDDDRGPR
RGLDDDRGPWRNADDDRIPRRGADDDRGPWRNMDDDRMSRRADDDRISRRGEDSRPGPWR
PFVKPGGWREKEKAREESWGPPRESRPPEEREWERERDRDNPDREENDKDPERERDRERD
GDREERFRRPRDEGGWRRGPAEEASSWRDSSRRDDRDRDDRRRERDDRRDLRDRRDLRDD
RDRRGPPLRSERDEVSSWRRADDRKDDRAEERDPPRRVPPPVLSRDRDRDRDRDRDRDRE
REREREREGEKEKTSWRAEKDRESLRRTKNETDEDGWTTVRR
Sequence of entity 2 (p), FASTA
>8SUP_2 Eukaryotic translation initiation factor 3 subunit C (chains p)
MKIRDVTKCLEEFELLGKAYGKAKSIVDKEGVPRFYIRILADLEDYLNELWEDKEGKKKM
NKNNAKALSTLRQKIRKYNRDFESHITNYKQNPEQSADEDAEKNEEDSEGSSDEDEDEDG
VSAAAFLKKKAEAPSGESRKFLKKMEDEDEDSEDSEDDEEWDTGSTSSDSDSEEEEGKQT
ALASRFLKKAPTTEEDKKAAEKKREDKAKKKHDRKSKRLDEEEEDNEGGEWERVRGGVPL
VKEKPKMFAKGTEITHAVVIKKLNEILQARGKKGTDRAAQIELLQLLVQIASENNLGEGV
IVKIKFNIIASLYDYNPNLATYMKPEMWQKCLDCINELMDILFANPNIFVGENILEESEN
LQNVDQPLRVRGCILTLVERMDEEFTKIMQNTDPHSQEYVEHLKDEAQVCAIIERVQRYL
EEKGTTEEICRVYLRRILHTYYKFDYKAHQRQLTPPEGSSKSEQDQAENEGEDSAVLMER
LCKYIYAKDRTDRIRTCAILCHIYHHYLHSRWYQARDLMLMSHLQDNIQHADPPVQILYN
RTMVQLGICAFRQGLTKDAHNALLDIQSSGRAKELLGQGLLLRSLQERNQEQEKVERRRQ
VPFHLHINLELLECVYLVSAMLLEIPYMAAHESDARRRMISKQFHHQLRVGERQPLLGPP
ESMREHVVAASKAMKMGDWKTCHSFIINEKMNGKVWDLFPEADKVRTMLVRKIQEESLRT
YLFTYSSVYDSISMETLSDMFELDLPTVHSIISKMIINEELMASLDQPTQTVVMHRTEPT
AQQNLALQLAEKLGSLVENNERVFDHKQGTYGGYFRDQKDGYRKNEGYMRRGGYRQQQSQ
TAY
Sequence of entity 3 (q), FASTA
>8SUP_3 Eukaryotic translation initiation factor 3 subunit E (chains q)
MAEYDLTTRIAHFLDRHLVFPLLEFLSVKEIYNEKELLQGKLDLLSDTNMVDFAMDVYKN
LYSDDIPHALREKRTTVVAQLKQLQAETEPIVKMFEDPETTRQMQSTRDGRMLFDYLADK
HGFRQEYLDTLYRYAKFQYECGNYSGAAEYLYFFRVLVPATDRNALSSLWGKLASEILMQ
NWDAAMEDLTRLKETIDNNSVSSPLQSLQQRTWLIHWSLFVFFNHPKGRDNIIDLFLYQP
QYLNAIQTMCPHILRYLTTAVITNKDVRKRRQVLKDLVKVIQQESYTYKDPITEFVECLY
VNFDFDGAQKKLRECESVLVNDFFLVACLEDFIENARLFIFETFCRIHQCISINMLADKL
NMTPEEAERWIVNLIRNARLDAKIDSKLGHVVMGNNAVSPYQQVIEKTKSLSFRSQMLAM
NIEKKLNQNSRSEAPNWATQDSGFY
Sequence of entity 4 (r), FASTA
>8SUP_4 Eukaryotic translation initiation factor 3 subunit F (chains r)
MATPAVSASAPPATPAATPAAAAAPASAPAAAPAPTPAPAPAAAPAAGAAPAAAADPAAA
AAAAGTGQTPASAQAPAQTSAPSLPGPALPGPFPGGRVVRLHPVILASIVDSYERRNEGA
ARVIGTLLGTVDKHSVEVTNCFSVPHNESEDEVAVDMEFAKNMYELHKKVSPNELILGWY
ATGHDITEHSVLIHEYYSREAPNPIHLTVDTSLQNGRMSIKAYVSTSMGVPGRTMGVMFT
PLTVKYAYYDTERIGVDLIMKTCFSPNRVIGLSSDLQQVGGASARIQDALSTVLQYAEDV
LSGKVSADNTVGRFLMSLVNQVPKIVPDDFETMLNSNINDLLMVTYLANLTQSQIALNEK
LVNL
Sequence of entity 5 (s), FASTA
>8SUP_5 Eukaryotic translation initiation factor 3 subunit H (chains s)
MASRKEGTGSGGTSSSSATGVVGKGKGKGGSGDSAVKQVQIDGLVVLKIIKHYQEEGQGT
EVVQGVLLGLVVEDRLEITNCFPFPQHTEDDADFDEVQYQMEMMRSLRHVNIDHLHVGWY
QSTYYGSFVTRALLDSQFSYQHAIEESVVLIYDPIKTAQGSLSLKAYRLTPKLMEVCKEK
DFSPEALKKANITFEHMFEEVPIVIKNSHLINVLMWELEKKSAVADKHELLSLASSNHLG
KNLQLLMDRVDEMSQDIVKYNTYMRNTSKQQQQKHQYQQRRQQENMQRQSRGEPPLPEED
LSKLFKPPQPPARMDSLLIAGQINTYCQNIKEFTAQNLGKLFMAQALQEYNN
Sequence of entity 6 (t), FASTA
>8SUP_6 Eukaryotic translation initiation factor 3 subunit K (chains t)
MAMFEQMRANVGKLLKGIDRYNPENLATLERYVETQAKENAYDLEANLAVLKLYQFNPAF
FQTTVTAQILLKALTNLPHTDFTLCKCMIDQAHQEERPIRQILYLGDLLETCHFQAFWQA
LDENMDLLEGITGFEDSVRKFICHVVGITYQHIDRWLLAEMLGDLTDSQLKMWMSKYGWS
ADESGQIFICSQEESIKPKNIVEKIDFDSVSSIMASSQ
Sequence of entity 7 (u), FASTA
>8SUP_7 Eukaryotic translation initiation factor 3 subunit L (chains u)
MSYPADDYESEAVYDPYAYPSDYDMHTGDPKQDLAYERQYEQQTYQVIPEVIRNFIQYFH
KTVSDLIDQKVYELQASRVSSDVIDQKVYEIQDIYENSWTKLTERFFKNTPWPEAETIAP
QVGNDAVFLILYKELYYRHIYAKVSGGPSLAQRFESYYNYCNLFNYILNADGPAPLELPN
QWLWDIIDEFIYQFQSFSQYRCKTAKKSEEEIDFLRSNPKIWNVHSVLNVLHSLVDKSNI
NRQLEVYTSGGDPESVAGEYGRHSLYKMLGYFSLVGLLRLHSLLGDYYQAIKVLENIELN
KKSMYSRVPECQVTTYYYVGFAYLMMRRYQDAIRVFANILLYIQRTKSMFQRTTYKYEMI
NKQNEQMHALLAIALTMYPMRIDESIHLQLREKYGDKMLRMQKGDPQVYEELFSYSCPKF
LSPVVPNYDSVHPNYHKEPFLQQLKVFSDEVQQQAQLSTIRSFLKLYTTMPVAKLAGFLD
LTEQEFRIQLLVFKHKMKNLVWTSGISALDGEFQSASEVDFYIDKDMIHIADTKVARRYG
DFFIRQIHKFEELNRTLKKMGQRP
Sequence of entity 8 (v), FASTA
>8SUP_8 Eukaryotic translation initiation factor 3 subunit M (chains v)
MSVPAFIDISEEDQAAELRAYLKSKGAEISEENSEGGLHVDLAQIIEACDVCLKEDDKDV
ESVMNSVVSLLLILEPDKQEALIESLCEKLVKFREGERPSLRLQLLSNLFHGMDKNTPVR
YTVYCSLIKVAASCGAIQYIPTELDQVRKWISDWNLTTEKKHTLLRLLYEALVDCKKSDA
ASKVMVELLGSYTEDNASQARVDAHRCIVRALKDPNAFLFDHLLTLKPVKFLEGELIHDL
LTIFVSAKLASYVKFYQNNKDFIDSLGLLHEQNMAKMRLLTFMGMAVENKEISFDTMQQE
LQIGADDVEAFVIDAVRTKMVYCKIDQTQRKVVVSHSTHRTFGKQQWQQLYDTLNAWKQN
LNKVKNSLLSLSDT
Sequence of entity 9 (2), FASTA
>8SUP_9 18S rRNA (chains 2)
UACCUGGUUGAUCCUGCCAGUAGCAUAUGCUUGUCUCAAAGAUUAAGCCAUGCAUGUCUA
AGUACGCACGGCCGGUACAGUGAAACUGCGAAUGGCUCAUUAAAUCAGUUAUGGUUCCUU
UGGUCGCUCGCUCCUCUCCUACUUGGAUAACUGUGGUAAUUCUAGAGCUAAUACAUGCCG
ACGGGCGCUGACCCCCUUCGCGGGGGGGAUGCGUGCAUUUAUCAGAUCAAAACCAACCCG
GUCAGCCUCCCCCCGGCCCCGGCCGGGGGGGUGGGCGCCGGCGGCUUUGGUGACUCUAGA
UAACCUCGGGCCGAUCGCACGCCCUCCGUGGCGGCGACGACCCAUUCGAACGUCUGCCCU
AUCAACUUUCGAUGGUAGUCGCCGUGCCUACCAUGGUGACCACGGGUGACGGGGAAUCAG
GGUUCGAUUCCGGAGAGGGAGCCUGAGAAACGGCUACCACAUCCAAGGAAGGCAGCAGGC
GCGCAAAUUACCCACUCCCGACCCGGGGAGGUAGUGACGAAAAAUAACAAUACAGGACUC
UUUCGAGGCCCUGUAAUUGGAAUGAGUCCACUUUAAAUCCUUUAACGAGGAUCCAUUGGA
GGGCAAGUCUGGUGCCAGCAGCCGCGGUAAUUCCAGCUCCAAUAGCGUAUAUUAAAGUUG
CUGCAGUUAAAAAGCUCGUAGUUGGAUCUUGGGAGCGGGCGGGCGGUCCGCCGCGAGGCG
AGCCACCGCCCGUCCCCGCCCCUUGCCUCUCGGCGCCCCCUCGAUGCUCUUAGCUGAGUG
UCCCGCGGGGCCCGAAGCGUUUACUUUGAAAAAAUUAGAGUGUUCAAAGCAGGCCCGAGC
CGCCUGGAUACCGCAGCUAGGAAUAAUGGAAUAGGACCGCGGUUCUAUUUUGUUGGUUUU
CGGAACUGAGGCCAUGAUUAAGAGGGACGGCCGGGGGCAUUCGUAUUGCGCCGCUAGAGG
UGAAAUUCUUGGACCGGCGCAAGACGGACCAGAGCGAAAGCAUUUGCCAAGAAUGUUUUC
AUUAAUCAAGAACGAAAGUCGGAGGUUCGAAGACGAUCAGAUACCGUCGUAGUUCCGACC
AUAAACGAUGCCGACCGGCGAUGCGGCGGCGUUAUUCCCAUGACCCGCCGGGCAGCUUCC
GGGAAACCAAAGUCUUUGGGUUCCGGGGGGAGUAUGGUUGCAAAGCUGAAACUUAAAGGA
AUUUGGCGAAGGGCACCACCAGGAGUGGAGCCUGCGGCUUAAUUUGACUCAACACGGGAA
ACCUCACCCGGCCCGGACACGGACAGGAUUGACAGAUUGAUAGCUCUUUCUCGAUUCCGU
GGGUGGUGGUGCAUGGCCGUUCUUAGUUGGUGGAGCGAUUUGUCUGGUUAAUUCCGAUAA
CGAACGAGACUCUGGCAUGCUAACUAGUUACGCGACCCCCGAGCGGUCGGCGUCCCCCAA
CUUCUUAGAGGGACAAGUGGCGUUCAGCCACCCGAGAUUGAGCAAUAACAGGUCUGUGAU
GCCCUUAGAUGUCCGGGGCUGCACGCGCGCUACACUGACUGGCUCAGCGUGUGCCUACCC
UACGCCGGCAGGCGCGGGUAACCCGUUGAACCCCAUUCGUGAUGGGGAUCGGGGAUUGCA
AUUAUUCCCCAUGAACGAGGAAUUCCCAGUAAGUGCGGGUCAUAAGCUUGCGUUGAUUAA
GUCCCUGCCCUUUGUACACACCGCCCGUCGCUACUACCGAUUGGAUGGUUUAGUGAGGCC
CUCGGAUCGGCCCCGCCGGGGUCGGCCCACGGCCCUGGCGGAGCGCUGAGAAGACGGUCG
AACUUGACUAUCUAGAGGAAGUAAAAGUCGUAACAAGGUUUCCGUAGGUGAACCUGCGGA
AGGAUCAUUA
Sequence of entity 10 (3), FASTA
>8SUP_10 EMCV mRNA (chains 3)
CCUUUGCAGGCAGCGGAACCCCCCACCUGGCGACAGGUGCCUCUGCGGCCAAAAGCCACG
UGUAUAAGAUACACCUGCAAAGGAAUAUG
Sequence of entity 11 (A), FASTA
>8SUP_11 Eukaryotic translation initiation factor 1A, X-chromosomal (chains A)
MPKNKGKGGKNRRRGKNENESEKRELVFKEDGQEYAQVIKMLGNGRLEAMCFDGVKRLCH
IRGKLRKKVWINTSDIILVGLRDYQDNKADVILKYNADEARSLKAYGELPEHAKINETDT
FGPGDDDEIQFDDIGDDDEDIDDI
Sequence of entity 12 (B), FASTA
>8SUP_12 uS2 (SA) (chains B)
MSGALDVLQMKEEDVLKFLAAGTHLGGTNLDFQMEQYIYKRKSDGIYIINLKRTWEKLLL
AARAIVAIENPADVSVISSRNTGQRAVLKFAAATGATPIAGRFTPGTFTNQIQTAFREPR
LLVVTDPRADHQPLTEASYVNLPTIALCNTDSPLRYVDIAIPCNNKGAHSVGLMWWMLAR
EVLRMRGTISREHPWEVMPDLYFYRDPEEIEKEEQAAAEKAVTKEEFQGEWTAPAPEFTA
TQPEVADWSEGVQVPSVPIQQFPTEDWSAQPATEDWSAAPTAQATEWVGTTTEWS

Ligands and cofactors

IDNameFormulaCopies
ZNZinc ionZn1

Primary citation

The mechanism of ribosomal recruitment during translation initiation on the Type 2 encephalomyocarditis virus IRES. Bhattacharjee, S., Abaeva, I.S., Brown, Z.P. et al. EMBO J (2026). DOI 10.1038/s44318-026-00735-x · PubMed

Other PDB entries of the same protein (UniProt G1SMZ5), best resolution first:

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