36BM: 26S proteasome regulatory subunit 7 homolog

yeast 26S proteasome base assembly intermediate, base-Hsm3-Nas6 with Rpt4-EQ. Determined by electron microscopy at 3.82 Å resolution. Released 19 Aug 2026.

Method
Electron microscopy
Resolution
3.82 Å
Organism
Saccharomyces cerevisiae
Chains
11
Atoms
36,449
Mol. weight
607.7 kDa
Ligands
ATP
Released
19 Aug 2026

Explore 36BM in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

36BM contains 289 α-helices and 130 β-strands across 11 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: 25 helices, 18 β-strands

ElementResiduesLengthSheet
α-helix31-399
α-helix46-6722
β-strand7611
α-helix77-782
α-helix79-813
α-helix84-9310
α-helix94-963
β-strand97-106102
β-strand144-14962
β-strand154-15742
β-strand15912
α-helix165-1673
β-strand173-17642
β-strand183-18642
α-helix187-1926
β-strand199-20133
α-helix215-22511
α-helix227-2304
α-helix232-2387
α-helix240-2434
β-strand245-24953
α-helix256-26611
β-strand270-27563
α-helix276-2827
α-helix287-30014
β-strand304-30963
α-helix312-3154
β-strand31614
α-helix317-3182
β-strand32715
α-helix328-34215
β-strand349-35573
α-helix358-3603
β-strand36114
β-strand373-37643
α-helix378-3803
α-helix382-39312
β-strand39816
α-helix404-4096
α-helix416-43217
β-strand43816
α-helix440-4467
α-helix447-4515
Chain B: 23 helices, 14 β-strands
ElementResiduesLengthSheet
α-helix45-484
α-helix56-8227
α-helix87-10014
β-strand104-114112
β-strand117-12152
α-helix126-1272
β-strand128-13252
β-strand13611
β-strand146-15052
β-strand156-15942
α-helix168-1703
β-strand172-17437
α-helix181-1833
α-helix188-1947
α-helix195-1995
α-helix200-2034
α-helix205-2117
α-helix213-2164
β-strand218-22367
α-helix229-23911
β-strand243-24867
α-helix249-2546
α-helix260-27314
β-strand277-28267
α-helix285-2917
α-helix297-2993
α-helix301-31313
β-strand322-32877
α-helix331-3333
α-helix336-3383
β-strand347-35047
α-helix355-36612
β-strand37118
α-helix389-40517
β-strand41118
α-helix4121
α-helix413-42715
Chain C: 53 helices, 13 β-strands
ElementResiduesLengthSheet
α-helix41-5717
α-helix61-633
α-helix64-7916
α-helix87-926
α-helix96-10510
α-helix109-12214
α-helix127-1282
α-helix133-1408
α-helix147-1493
α-helix151-17626
α-helix194-1963
α-helix197-21317
α-helix217-22610
α-helix230-2367
α-helix242-25110
α-helix253-2553
α-helix2571
α-helix260-27415
α-helix278-28811
α-helix291-2999
α-helix304-31613
α-helix327-3304
α-helix335-34511
α-helix355-3584
α-helix360-3623
α-helix366-3716
α-helix376-39015
α-helix404-4074
α-helix413-42513
α-helix431-44010
α-helix445-45814
α-helix469-47810
α-helix483-49614
α-helix503-51412
α-helix520-53314
α-helix540-55213
α-helix557-5593
α-helix562-57312
α-helix578-5814
α-helix582-5898
α-helix596-60712
α-helix614-62310
α-helix724-74724
α-helix751-76717
α-helix770-78314
α-helix790-7978
α-helix805-81814
α-helix825-83713
α-helix842-85514
α-helix857-8604
β-strand862-86329
β-strand867110
β-strand873110
α-helix875-88713
α-helix891-8944
α-helix898-90710
β-strand909-91029
β-strand912-916511
β-strand922-923211
β-strand926-932712
β-strand945-952812
β-strand955-956211
β-strand961-965512
β-strand970-972313
β-strand979-982411
β-strand983-985313
Chain D: 39 helices, 2 β-strands
ElementResiduesLengthSheet
α-helix8-2114
α-helix29-4214
α-helix52-6413
α-helix73-8311
α-helix89-957
α-helix98-1058
α-helix110-12112
α-helix134-1429
α-helix150-16314
α-helix167-1715
α-helix172-1765
α-helix178-18710
α-helix190-20617
α-helix214-2174
α-helix219-2202
α-helix221-2277
α-helix231-25121
α-helix254-2563
α-helix257-2615
α-helix265-2728
α-helix280-2834
α-helix285-29612
α-helix304-3096
α-helix310-3145
α-helix323-3297
α-helix332-3376
α-helix340-3467
α-helix354-3607
α-helix364-3707
α-helix371-3733
α-helix376-3816
α-helix384-39411
α-helix398-40710
α-helix409-4168
α-helix421-4233
α-helix427-44115
α-helix445-4484
α-helix449-4513
α-helix452-46312
β-strand46715
β-strand475114
Chain I: 2 helices, 5 β-strands
ElementResiduesLengthSheet
α-helix19-6648
α-helix68-692
β-strand70-7892
β-strand83-8862
β-strand92-9872
β-strand112-11542
β-strand122-12542
Chain J: 22 helices, 14 β-strands
ElementResiduesLengthSheet
α-helix47-9044
α-helix931
β-strand94-10292
β-strand107-11262
β-strand117-12262
α-helix1231
α-helix128-1303
β-strand136-14052
β-strand146-14942
α-helix171-1733
α-helix178-1847
α-helix185-1895
α-helix190-1934
α-helix195-2017
α-helix204-2063
β-strand208-212521
α-helix219-22911
β-strand233-238621
α-helix239-2413
α-helix249-26315
β-strand267-272621
α-helix274-2763
β-strand279122
α-helix280-2812
α-helix287-30216
β-strand312-317621
α-helix321-3233
β-strand324122
β-strand336-339421
α-helix340-3423
α-helix347-35812
β-strand362123
α-helix369-3724
α-helix380-39617
β-strand402123
α-helix404-41512
Chain K: 20 helices, 17 β-strands
ElementResiduesLengthSheet
α-helix48-9952
β-strand103-11192
β-strand117-12152
β-strand126-12942
β-strand13112
β-strand145-14952
β-strand155-15842
α-helix1591
α-helix1611
α-helix167-1715
α-helix180-1823
α-helix187-19610
α-helix198-2025
α-helix205-2106
α-helix212-2154
β-strand217-221515
α-helix228-23912
β-strand242-245415
α-helix248-2514
β-strand255114
α-helix258-27215
β-strand276-281615
α-helix283-2853
β-strand288116
α-helix289-2913
α-helix296-31318
β-strand322-327615
β-strand333116
α-helix335-3384
β-strand345115
β-strand348115
α-helix354-36613
β-strand370117
α-helix376-3827
α-helix388-40417
β-strand410117
α-helix412-42615
Chain L: 3 helices, 12 β-strands
ElementResiduesLengthSheet
α-helix4-63
β-strand8-10332
β-strand12-14333
β-strand15-16234
β-strand23-24231
β-strand25-26234
β-strand32-37632
α-helix41-433
β-strand46-51632
β-strand64-68532
β-strand73-77533
β-strand87-91533
β-strand96-101633
β-strand103130
α-helix116-12813

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

Molecules and chains

MoleculeChainsTypeLengthOrganismUniProt
26S proteasome regulatory subunit 7 homologAprotein467Saccharomyces cerevisiaeP33299 (AlphaFold model)
26S proteasome regulatory subunit 4 homologBprotein437Saccharomyces cerevisiaeP40327 (AlphaFold model)
26S proteasome regulatory subunit RPN1Cprotein993Saccharomyces cerevisiaeP38764 (AlphaFold model)
DNA mismatch repair protein HSM3Dprotein480Saccharomyces cerevisiaeP38348 (AlphaFold model)
26S proteasome subunit RPT4Kprotein437Saccharomyces cerevisiaeP53549
26S proteasome regulatory subunit 6APprotein434Saccharomyces cerevisiaeP33297
26S proteasome regulatory subunit 8 homologIprotein405Saccharomyces cerevisiaeQ01939
26S proteasome regulatory subunit 6B homologJprotein428Saccharomyces cerevisiaeP33298
26S proteasome regulatory subunit RPN2Zprotein945Saccharomyces cerevisiaeP32565
26S proteasome regulatory subunit RPN13Lprotein156Saccharomyces cerevisiaeO13563
Probable 26S proteasome regulatory subunit p28Nprotein228Saccharomyces cerevisiaeP50086
Sequence of entity 1 (A), FASTA
>36BM_1 26S proteasome regulatory subunit 7 homolog (chains A)
MPPKEDWEKYKAPLEDDDKKPDDDKIVPLTEGDIQVLKSYGAAPYAAKLKQTENDLKDIE
ARIKEKAGVKESDTGLAPSHLWDIMGDRQRLGEEHPLQVARCTKIIKGNGESDETTTDNN
NSGNSNSNSNQQSTDADEDDEDAKYVINLKQIAKFVVGLGERVSPTDIEEGMRVGVDRSK
YNIELPLPPRIDPSVTMMTVEEKPDVTYSDVGGCKDQIEKLREVVELPLLSPERFATLGI
DPPKGILLYGPPGTGKTLCARAVANRTDATFIRVIGSELVQKYVGEGARMVRELFEMART
KKACIIFFDEIDAVGGARFDDGAGGDNEVQRTMLELITQLDGFDPRGNIKVMFATNRPNT
LDPALLRPGRIDRKVEFSLPDLEGRANIFRIHSKSMSVERGIRWELISRLCPNSTGAELR
SVCTEAGMFAIRARRKVATEKDFLKAVDKVISGYKKFSSTSRYMQYN
Sequence of entity 2 (B), FASTA
>36BM_2 26S proteasome regulatory subunit 4 homolog (chains B)
MGQGVSSGQDKKKKKGSNQKPKYEPPVQSKFGRKKRKGGPATAEKLPNIYPSTRCKLKLL
RMERIKDHLLLEEEFVSNSEILKPFEKKQEEEKKQLEEIRGNPLSIGTLEEIIDDDHAIV
TSPTMPDYYVSILSFVDKELLEPGCSVLLHHKTMSIVGVLQDDADPMVSVMKMDKSPTES
YSDIGGLESQIQEIKESVELPLTHPELYEEMGIKPPKGVILYGAPGTGKTLLAKAVANQT
SATFLRIVGSELIQKYLGDGPRLCRQIFKVAGENAPSIVFIDEIDAIGTKRYDSNSGGER
EIQRTMLELLNQLDGFDDRGDVKVIMATNKIETLDPALIRPGRIDRKILFENPDLSTKKK
ILGIHTSKMNLSEDVNLETLVTTKDDLSGADIQAMCTEAGLLALRERRMQVTAEDFKQAK
ERVMKNKVEENLEGLYL
Sequence of entity 3 (C), FASTA
>36BM_3 26S proteasome regulatory subunit RPN1 (chains C)
MVDESDKKQQTIDEQSQISPEKQTPNKKDKKKEEEEQLSEEDAKLKTDLELLVERLKEDD
SSLYEASLNALKESIKNSTSSMTAVPKPLKFLRPTYPDLCSIYDKWTDPNLKSSLADVLS
ILAMTYSENGKHDSLRYRLLSDVSDFEGWGHEYIRHLALEIGEVYNDQVEKDAEDETSSD
GSKSDGSAATSGFEFSKEDTLRLCLDIVPYFLKHNGEEDAVDLLLEIESIDKLPQFVDEN
TFQRVCQYMVACVPLLPPPEDVAFLKTAYSIYLSQNELTDAIALAVRLGEEDMIRSVFDA
TSDPVMHKQLAYILAAQKTSFEYEGVQDIIGNGKLSEHFLYLAKELNLTGPKVPEDIYKS
HLDNSKSVFSSAGLDSAQQNLASSFVNGFLNLGYCNDKLIVDNDNWVYKTKGDGMTSAVA
SIGSIYQWNLDGLQQLDKYLYVDEPEVKAGALLGIGISASGVHDGEVEPALLLLQDYVTN
PDTKISSAAILGLGIAFAGSKNDEVLGLLLPIAASTDLPIETAAMASLALAHVFVGTCNG
DITTSIMDNFLERTAIELKTDWVRFLALALGILYMGQGEQVDDVLETISAIEHPMTSAIE
VLVGSCAYTGTGDVLLIQDLLHRLTPKNVKGEEDADEEETAEGQTNSISDFLGEQVNEPT
KNEEAEIEVDEMEVDAEGEEVEVKAEITEKKNGESLEGEEIKSEEKKGKSSDKDATTDGK
NDDEEEEKEAGIVDELAYAVLGIALIALGEDIGKEMSLRHFGHLMHYGNEHIRRMVPLAM
GIVSVSDPQMKVFDTLTRFSHDADLEVSMNSIFAMGLCGAGTNNARLAQLLRQLASYYSR
EQDALFITRLAQGLLHLGKGTMTMDVFNDAHVLNKVTLASILTTAVGLVSPSFMLKHHQL
FYMLNAGIRPKFILALNDEGEPIKVNVRVGQAVETVGQAGRPKKITGWITQSTPVLLNHG
ERAELETDEYISYTSHIEGVVILKKNPDYREEE
Sequence of entity 4 (D), FASTA
>36BM_4 DNA mismatch repair protein HSM3 (chains D)
MSEKETNYVENLLTQLENELNEDNLPEDINTLLRKCSLNLVTVVSLPDMDVKPLLATIKR
FLTSNVSYDSLNYDYLLDVVDKLVPMADFDDVLEVYSAEDLVKALRSEIDPLKVAACRVI
ENSQPKGLFATSNIIDILLDILFDEKVENDKLITAIEKALERLSTDELIRRRLFDNNLPY
LVSVKGRMETVSFVRLIDFLTIEFQFISGPEFKDIIFCFTKEEILKSVEDILVFIELVNY
YTKFLLEIRNQDKYWALRHVKKILPVFAQLFEDTENYPDVRAFSTNCLLQLFAEVSRIEE
DEYSLFKTMDKDSLKIGSEAKLITEWLELINPQYLVKYHKDVVENYFHVSGYSIGMLRNL
SADEECFNAIRNKFSAEIVLRLPYLEQMQVVETLTRYEYTSKFLLNEMPKVMGSLIGDGS
AGAIIDLETVHYRNSALRNLLDKGEEKLSVWYEPLLREYSKAVNGKNYSTGSETKIADCR
Sequence of entity 5 (K), FASTA
>36BM_5 26S proteasome subunit RPT4 (chains K)
MSEEQDPLLAGLGETSGDNHTQQSHEQQPEQPQETEEHHEEEPSRVDPEQEAHNKALNQF
KRKLLEHRRYDDQLKQRRQNIRDLEKLYDKTENDIKALQSIGQLIGEVMKELSEEKYIVK
ASSGPRYIVGVRNSVDRSKLKKGVRVTLDITTLTIMRILPRETDPLVYNMTSFEQGEITF
DGIGGLTEQIRELREVIELPLKNPEIFQRVGIKPPKGVLLYGPPGTGKTLLAKAVAATIG
ANFIFSPASGIVDKYIGESARIIREMFAYAKEHEPCIIFMDQVDAIGGRRFSEGTSADRE
IQRTLMELLTQMDGFDNLGQTKIIMATNRPDTLDPALLRPGRLDRKVEIPLPNEAGRLEI
FKIHTAKVKKTGEFDFEAAVKMSDGFNGADIRNCATEAGFFAIRDDRDHINPDDLMKAVR
KVAEVKKLEGTIEYQKL
Sequence of entity 6 (P), FASTA
>36BM_6 26S proteasome regulatory subunit 6A (chains P)
MATLEELDAQTLPGDDELDQEILNLSTQELQTRAKLLDNEIRIFRSELQRLSHENNVMLE
KIKDNKEKIKNNRQLPYLVANVVEVMDMNEIEDKENSESTTQGGNVNLDNTAVGKAAVVK
TSSRQTVFLPMVGLVDPDKLKPNDLVGVNKDSYLILDTLPSEFDSRVKAMEVDEKPTETY
SDVGGLDKQIEELVEAIVLPMKRADKFKDMGIRAPKGALMYGPPGTGKTLLARACAAQTN
ATFLKLAAPQLVQMYIGEGAKLVRDAFALAKEKAPTIIFIDELDAIGTKRFDSEKSGDRE
VQRTMLELLNQLDGFSSDDRVKVLAATNRVDVLDPALLRSGRLDRKIEFPLPSEDSRAQI
LQIHSRKMTTDDDINWQELARSTDEFNGAQLKAVTVEAGMIALRNGQSSVKHEDFVEGIS
EVQARKSKSVSFYA
Sequence of entity 7 (I), FASTA
>36BM_7 26S proteasome regulatory subunit 8 homolog (chains I)
MTAAVTSSNIVLETHESGIKPYFEQKIQETELKIRSKTENVRRLEAQRNALNDKVRFIKD
ELRLLQEPGSYVGEVIKIVSDKKVLVKVQPEGKYIVDVAKDINVKDLKASQRVCLRSDSY
MLHKVLENKADPLVSLMMVEKVPDSTYDMVGGLTKQIKEIKEVIELPVKHPELFESLGIA
QPKGVILYGPPGTGKTLLARAVAHHTDCKFIRVSGAELVQKYIGEGSRMVRELFVMAREH
APSIIFMDEIDSIGSTRVEGSGGGDSEVQRTMLELLNQLDGFETSKNIKIIMATNRLDIL
DPALLRPGRIDRKIEFPPPSVAARAEILRIHSRKMNLTRGINLRKVAEKMNGCSGADVKG
VCTEAGMYALRERRIHVTQEDFELAVGKVMNKNQETAISVAKLFK
Sequence of entity 8 (J), FASTA
>36BM_8 26S proteasome regulatory subunit 6B homolog (chains J)
MEELGIVTPVEKAVEEKPAVKSYASLLAQLNGTVNNNSALSNVNSDIYFKLKKLEKEYEL
LTLQEDYIKDEQRHLKRELKRAQEEVKRIQSVPLVIGQFLEPIDQNTGIVSSTTGMSYVV
RILSTLDRELLKPSMSVALHRHSNALVDILPPDSDSSISVMGENEKPDVTYADVGGLDMQ
KQEIREAVELPLVQADLYEQIGIDPPRGVLLYGPPGTGKTMLVKAVANSTKAAFIRVNGS
EFVHKYLGEGPRMVRDVFRLARENAPSIIFIDEVDSIATKRFDAQTGSDREVQRILIELL
TQMDGFDQSTNVKVIMATNRADTLDPALLRPGRLDRKIEFPSLRDRRERRLIFGTIASKM
SLAPEADLDSLIIRNDSLSGAVIAAIMQEAGLRAVRKNRYVILQSDLEEAYATQVKTDNT
VDKFDFYK
Sequence of entity 9 (Z), FASTA
>36BM_9 26S proteasome regulatory subunit RPN2 (chains Z)
MSLTTAAPLLALLRENQDSVKTYALESINNVVDQLWSEISNELPDIEALYDDDTFSDREM
AALIASKVYYNLGEYESAVKYALAAKDRFDIDEKSQFVETIVSKSIEMYVQEASKQYTKD
EQFYTKDIIDPKLTSIFERMIEKCLKASELKLALGIALEGYRLDIIESALKSKLDQDSTS
ENVKIINYLLTLAITTVTNSKFRSSILRKSFDFLMNMPNCDYLTLNKVVVNLNDAGLALQ
LFKKLKEENDEGLSAQIAFDLVSSASQQLLEILVTELTAQGYDPALLNILSGLPTCDYYN
TFLLNNKNIDIGLLNKSKSSLDGKFSLFHTAVSVANGFMHAGTTDNSFIKANLPWLGKAQ
NWAKFTATASLGVIHKGNLLEGKKVMAPYLPGSRASSRFIKGGSLYGLGLIYAGFGRDTT
DYLKNIIVENSGTSGDEDVDVLLHGASLGIGLAAMGSANIEVYEALKEVLYNDSATSGEA
AALGMGLCMLGTGKPEAIHDMFTYSQETQHGNITRGLAVGLALINYGRQELADDLITKML
ASDESLLRYGGAFTIALAYAGTGNNSAVKRLLHVAVSDSNDDVRRAAVIALGFVLLRDYT
TVPRIVQLLSKSHNAHVRCGTAFALGIACAGKGLQSAIDVLDPLTKDPVDFVRQAAMIAL
SMILIQQTEKLNPQVADINKNFLSVITNKHQEGLAKFGACVAQGIMNAGGRNVTIQLENA
DTGTLDTKSVVGLVMFSQFWYWFPLAHFLSLSFTPTTVIGIRGSDQAIPKFQMNCYAKED
AFSYPRMYEEASGKEVEKVATAVLSTTARAKARAKKTKKEKGPNEEEKKKEHEEKEKERE
TNKKGIKETKENDEEFYKNKYSSKPYKVDNMTRILPQQSRYISFIKDDRFVPVRKFKGNN
GVVVLRDREPKEPVALIETVRQMKDVNAPLPTPFKVDDNVDFPSA
Sequence of entity 10 (L), FASTA
>36BM_10 26S proteasome regulatory subunit RPN13 (chains L)
MSMSSTVIKFRAGVCEYNEDSRLCTPIPVQGEIEIKPNEEEELGFWDFEWRPTEKPVGRE
LDPISLILIPGETMWVPIKSSKSGRIFALVFSSNERYFFWLQEKNSGNLPLNELSAKDKE
IYNKMIGVLNNSSESDEEESNDEKQKAQDVDVSMQD
Sequence of entity 11 (N), FASTA
>36BM_11 Probable 26S proteasome regulatory subunit p28 (chains N)
MSNYPLHQACMENEFFKVQELLHSKPSLLLQKDQDGRIPLHWSVSFQAHEITSFLLSKME
NVNLDDYPDDSGWTPFHIACSVGNLEVVKSLYDRPLKPDLNKITNQGVTCLHLAVGKKWF
EVSQFLIENGASVRIKDKFNQIPLHRAASVGSLKLIELLCGLGKSAVNWQDKQGWTPLFH
ALAEGHGDAAVLLVEKYGAEYDLVDNKGAKAEDVALNEQVKKFFLNNV

Ligands and cofactors

IDNameFormulaCopies
ATPAdenosine-5'-triphosphateC10 H16 N5 O13 P35

Primary citation

Chaperones shape the conformational landscape of 26S-proteasome-base assembly for allosteric ATPase motor activation. Hsieh, H.H., Martin, A. bioRxiv (2026). DOI 10.64898/2026.06.01.729410 · PubMed

Other PDB entries of the same protein (UniProt P33299 (AlphaFold model), which also has an AlphaFold model), best resolution first:

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