7ONB: U2 5' module of the A3'-SSA complex

Structure of the U2 5' module of the A3'-SSA complex. Determined by electron microscopy at 3.1 Å resolution. Released 4 Aug 2021.

Method: Electron microscopy
Resolution: 3.1 Å
Organisms: Homo sapiens, unidentified adenovirus
Chains: 11
Atoms: 20,140
Mol. weight: 693.83 kDa
Ligands: SJT, ZN
Released: 4 Aug 2021

Explore 7ONB in 3D Show helices and sheets RCSB PDB PDBe

Secondary structure: helices and β-sheets

7ONB contains 118 α-helices and 126 β-strands across 9 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: 20 helices, 99 β-strands

Element	Residues	Length	Sheet
β-strand	3-9	7	1
β-strand	16-20	5	2
β-strand	29-33	5	2
β-strand	37-43	7	2
β-strand	50-57	8	2
β-strand	62-68	7	3
β-strand	77-82	6	3
β-strand	86-93	8	3
β-strand	98-106	9	3
β-strand	120-123	4	4
β-strand	129-133	5	4
β-strand	136	1	5
β-strand	139-143	5	4
β-strand	144-145	2	6
β-strand	153-154	2	6
α-helix	156-157	2
β-strand	158-159	2	4
β-strand	166-173	8	5
β-strand	181-187	7	5
α-helix	190-193	4
α-helix	199-203	5
β-strand	207-214	8	5
β-strand	219-227	9	5
β-strand	232-237	6	7
α-helix	238-239	2
β-strand	248-252	5	7
β-strand	255-259	5	7
α-helix	265-266	2
β-strand	267-270	4	7
α-helix	271-272	2
β-strand	273-274	2	8
β-strand	289-293	5	9
β-strand	300-304	5	9
β-strand	309-316	8	9
β-strand	324-332	9	9
β-strand	336-341	6	10
β-strand	346-351	6	10
β-strand	356-361	6	10
β-strand	372-374	3	9
β-strand	386-387	2	8
β-strand	395-401	7	10
α-helix	405-406	2
β-strand	407-413	7	11
β-strand	422-427	6	11
α-helix	430-432	3
β-strand	434-440	7	11
β-strand	442-443	2	12
β-strand	444-450	7	13
β-strand	474	1	14
β-strand	477	1	15
β-strand	482	1	15
β-strand	485	1	14
β-strand	486-487	2	16
β-strand	491-492	2	16
β-strand	509	1	17
β-strand	515-519	5	17
β-strand	524-528	5	17
β-strand	535-536	2	17
α-helix	537-538	2
β-strand	546-549	4	18
β-strand	554-557	4	18
β-strand	563-566	4	18
β-strand	587-592	6	19
β-strand	605-609	5	19
β-strand	613-617	5	19
α-helix	621-623	3
β-strand	629-631	3	19
β-strand	637-643	7	20
β-strand	664-669	6	20
β-strand	673-678	6	20
β-strand	687-690	4	20
β-strand	700-706	7	21
β-strand	709-715	7	21
β-strand	720-724	5	21
β-strand	729-732	4	21
β-strand	734-735	2	12
β-strand	741-745	5	13
β-strand	753-758	6	13
β-strand	761-767	7	13
β-strand	774-780	7	11
β-strand	785-790	6	22
β-strand	797-804	8	22
α-helix	809-827	19
α-helix	833-844	12
α-helix	849-852	4
β-strand	862-869	8	22
β-strand	876-881	6	22
β-strand	886-894	9	23
β-strand	904-911	8	23
β-strand	914	1	24
β-strand	919	1	24
β-strand	924-928	5	23
α-helix	931-934	4
β-strand	936	1	25
β-strand	939-944	6	23
β-strand	949-955	7	26
β-strand	958-963	6	26
β-strand	966-972	7	26
β-strand	977-983	7	26
β-strand	990-996	7	27
β-strand	999-1004	6	27
β-strand	1009-1015	7	27
β-strand	1020-1027	8	27
β-strand	1036-1038	3	28
β-strand	1043-1047	5	28
β-strand	1052-1057	6	28
α-helix	1058-1059	2
β-strand	1087-1089	3	27
β-strand	1090-1096	7	28
β-strand	1101-1107	7	1
β-strand	1116-1121	6	1
β-strand	1126-1131	6	1
α-helix	1135-1150	16
α-helix	1160-1163	4
β-strand	1171	1	28
β-strand	1173-1175	3	1
α-helix	1176-1179	4
α-helix	1187-1194	8
α-helix	1201-1213	13

Chain B: 4 helices, 0 β-strands

Element	Residues	Length
α-helix	28-45	18
α-helix	47-56	10
α-helix	61-71	11
α-helix	79-81	3

Chain C: 63 helices, 0 β-strands

Element	Residues	Length
α-helix	489-506	18
α-helix	511-521	11
α-helix	523-526	4
α-helix	528-539	12
α-helix	546-562	17
α-helix	565-570	6
α-helix	571-578	8
α-helix	579-583	5
α-helix	587-604	18
α-helix	606-613	8
α-helix	614-616	3
α-helix	622-639	18
α-helix	641-652	12
α-helix	658-675	18
α-helix	676-682	7
α-helix	683-690	8
α-helix	691-695	5
α-helix	699-716	18
α-helix	722-724	3
α-helix	725-734	10
α-helix	740-753	14
α-helix	754-756	3
α-helix	759-776	18
α-helix	782-796	15
α-helix	803-805	3
α-helix	806-810	5
α-helix	811-818	8
α-helix	823-825	3
α-helix	827-844	18
α-helix	846-850	5
α-helix	855-858	4
α-helix	862-879	18
α-helix	886-901	16
α-helix	908-921	14
α-helix	922-928	7
α-helix	929-940	12
α-helix	945-964	20
α-helix	968-980	13
α-helix	987-1004	18
α-helix	1013-1020	8
α-helix	1021-1025	5
α-helix	1029-1045	17
α-helix	1047-1049	3
α-helix	1052-1062	11
α-helix	1063-1067	5
α-helix	1071-1087	17
α-helix	1090-1104	15
α-helix	1108-1122	15
α-helix	1125-1127	3
α-helix	1129-1134	6
α-helix	1135-1137	3
α-helix	1142-1158	17
α-helix	1159-1164	6
α-helix	1166-1177	12
α-helix	1182-1198	17
α-helix	1205-1215	11
α-helix	1216-1220	5
α-helix	1224-1241	18
α-helix	1243-1250	8
α-helix	1253-1255	3
α-helix	1259-1275	17
α-helix	1279-1282	4
α-helix	1299-1301	3

Chain D: 4 helices, 12 β-strands

Element	Residues	Length	Sheet
β-strand	10	1	29
β-strand	18-19	2	30
α-helix	20	1
β-strand	21-22	2	31
β-strand	30	1	32
β-strand	39-42	4	32
β-strand	44-45	2	30
α-helix	48-50	3
α-helix	52-54	3
β-strand	57	1	33
β-strand	58	1	31
β-strand	64	1	33
β-strand	67-68	2	31
β-strand	70-72	3	32
α-helix	73-77	5
β-strand	88	1	29

Chain F: 1 helix, 0 β-strands

Element	Residues	Length	Sheet
α-helix	165-179	15

Chain I: 14 helices, 2 β-strands

Element	Residues	Length	Sheet
α-helix	459-461	3
α-helix	462-468	7
α-helix	478-481	4
α-helix	485-492	8
α-helix	498-501	4
α-helix	502-504	3
α-helix	523-525	3
α-helix	526-529	4
α-helix	568-576	9
α-helix	580-582	3
α-helix	611-616	6
α-helix	632-638	7
α-helix	648-650	3
β-strand	651	1	34
β-strand	655	1	34
α-helix	681-682	2

Chain K: 3 helices, 6 β-strands

Element	Residues	Length	Sheet
β-strand	14-18	5	38
α-helix	26-32	7
β-strand	39-43	5	38
β-strand	56-61	6	38
α-helix	64-73	10
α-helix	74-76	3
β-strand	78-79	2	39
β-strand	82-83	2	39
β-strand	85-87	3	38

Chain M: 2 helices, 3 β-strands

Element	Residues	Length	Sheet
β-strand	46-48	3	35
β-strand	54-56	3	35
β-strand	61-63	3	35
α-helix	66-73	8
α-helix	76-86	11

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

Molecules and chains

Molecule	Chains	Type	Length	Organism	UniProt
Splicing factor 3B subunit 3	A	protein	1217	Homo sapiens	Q15393 (AlphaFold model)
Splicing factor 3B subunit 5	B	protein	86	Homo sapiens	Q9BWJ5 (AlphaFold model)
Splicing factor 3B subunit 1	C	protein	1304	Homo sapiens	O75533 (AlphaFold model)
PHD finger-like domain-containing protein 5A	D	protein	110	Homo sapiens	Q7RTV0 (AlphaFold model)
UNK	F	protein	21	Homo sapiens
Minx	G	RNA	229	unidentified adenovirus
RNU2	H	RNA	188	Homo sapiens
Splicing factor 3B subunit 2	I	protein	895	Homo sapiens	Q13435
Splicing factor 3A subunit 2	M	protein	464	Homo sapiens	Q15428
Splicing factor 3A subunit 3	N	protein	501	Homo sapiens	Q12874
Splicing factor 3B subunit 4	K	protein	424	Homo sapiens	Q15427

Sequence of entity 1 (A), FASTA

>7ONB_1 Splicing factor 3B subunit 3 (chains A)
MFLYNLTLQRATGISFAIHGNFSGTKQQEIVVSRGKILELLRPDPNTGKVHTLLTVEVFG
VIRSLMAFRLTGGTKDYIVVGSDSGRIVILEYQPSKNMFEKIHQETFGKSGCRRIVPGQF
LAVDPKGRAVMISAIEKQKLVYILNRDAAARLTISSPLEAHKANTLVYHVVGVDVGFENP
MFACLEMDYEEADNDPTGEAAANTQQTLTFYELDLGLNHVVRKYSEPLEEHGNFLITVPG
GSDGPSGVLICSENYITYKNFGDQPDIRCPIPRRRNDLDDPERGMIFVCSATHKTKSMFF
FLAQTEQGDIFKITLETDEDMVTEIRLKYFDTVPVAAAMCVLKTGFLFVASEFGNHYLYQ
IAHLGDDDEEPEFSSAMPLEEGDTFFFQPRPLKNLVLVDELDSLSPILFCQIADLANEDT
PQLYVACGRGPRSSLRVLRHGLEVSEMAVSELPGNPNAVWTVRRHIEDEFDAYIIVSFVN
ATLVLSIGETVEEVTDSGFLGTTPTLSCSLLGDDALVQVYPDGIRHIRADKRVNEWKTPG
KKTIVKCAVNQRQVVIALTGGELVYFEMDPSGQLNEYTERKEMSADVVCMSLANVPPGEQ
RSRFLAVGLVDNTVRIISLDPSDCLQPLSMQALPAQPESLCIVEMGGTEKQDELGERGSI
GFLYLNIGLQNGVLLRTVLDPVTGDLSDTRTRYLGSRPVKLFRVRMQGQEAVLAMSSRSW
LSYSYQSRFHLTPLSYETLEFASGFASEQCPEGIVAISTNTLRILALEKLGAVFNQVAFP
LQYTPRKFVIHPESNNLIIIETDHNAYTEATKAQRKQQMAEEMVEAAGEDERELAAEMAA
AFLNENLPESIFGAPKAGNGQWASVIRVMNPIQGNTLDLVQLEQNEAAFSVAVCRFSNTG
EDWYVLVGVAKDLILNPRSVAGGFVYTYKLVNNGEKLEFLHKTPVEEVPAAIAPFQGRVL
IGVGKLLRVYDLGKKKLLRKCENKHIANYISGIQTIGHRVIVSDVQESFIWVRYKRNENQ
LIIFADDTYPRWVTTASLLDYDTVAGADKFGNICVVRLPPNTNDEVDEDPTGNKALWDRG
LLNGASQKAEVIMNYHVGETVLSLQKTTLIPGGSESLVYTTLSGGIGILVPFTSHEDHDF
FQHVEMHLRSEHPPLCGRDHLSFRSYYFPVKNVIDGDLCEQFNSMEPNKQKNVSEELDRT
PPEVSKKLEDIRTRYAF

Sequence of entity 2 (B), FASTA

>7ONB_2 Splicing factor 3B subunit 5 (chains B)
MTDRYTIHSQLEHLQSKYIGTGHADTTKWEWLVNQHRDSYCSYMGHFDLLNYFAIAENES
KARVRFNLMEKMLQPCGPPADKPEEN

Sequence of entity 3 (C), FASTA

>7ONB_3 Splicing factor 3B subunit 1 (chains C)
MAKIAKTHEDIEAQIREIQGKKAALDEAQGVGLDSTGYYDQEIYGGSDSRFAGYVTSIAA
TELEDDDDDYSSSTSLLGQKKPGYHAPVALLNDIPQSTEQYDPFAEHRPPKIADREDEYK
KHRRTMIISPERLDPFADGGKTPDPKMNARTYMDVMREQHLTKEEREIRQQLAEKAKAGE
LKVVNGAAASQPPSKRKRRWDQTADQTPGATPKKLSSWDQAETPGHTPSLRWDETPGRAK
GSETPGATPGSKIWDPTPSHTPAGAATPGRGDTPGHATPGHGGATSSARKNRWDETPKTE
RDTPGHGSGWAETPRTDRGGDSIGETPTPGASKRKSRWDETPASQMGGSTPVLTPGKTPI
GTPAMNMATPTPGHIMSMTPEQLQAWRWEREIDERNRPLSDEELDAMFPEGYKVLPPPAG
YVPIRTPARKLTATPTPLGGMTGFHMQTEDRTMKSVNDQPSGNLPFLKPDDIQYFDKLLV
DVDESTLSPEEQKERKIMKLLLKIKNGTPPMRKAALRQITDKAREFGAGPLFNQILPLLM
SPTLEDQERHLLVKVIDRILYKLDDLVRPYVHKILVVIEPLLIDEDYYARVEGREIISNL
AKAAGLATMISTMRPDIDNMDEYVRNTTARAFAVVASALGIPSLLPFLKAVCKSKKSWQA
RHTGIKIVQQIAILMGCAILPHLRSLVEIIEHGLVDEQQKVRTISALAIAALAEAATPYG
IESFDSVLKPLWKGIRQHRGKGLAAFLKAIGYLIPLMDAEYANYYTREVMLILIREFQSP
DEEMKKIVLKVVKQCCGTDGVEANYIKTEILPPFFKHFWQHRMALDRRNYRQLVDTTVEL
ANKVGAAEIISRIVDDLKDEAEQYRKMVMETIEKIMGNLGAADIDHKLEEQLIDGILYAF
QEQTTEDSVMLNGFGTVVNALGKRVKPYLPQICGTVLWRLNNKSAKVRQQAADLISRTAV
VMKTCQEEKLMGHLGVVLYEYLGEEYPEVLGSILGALKAIVNVIGMHKMTPPIKDLLPRL
TPILKNRHEKVQENCIDLVGRIADRGAEYVSAREWMRICFELLELLKAHKKAIRRATVNT
FGYIAKAIGPHDVLATLLNNLKVQERQNRVCTTVAIAIVAETCSPFTVLPALMNEYRVPE
LNVQNGVLKSLSFLFEYIGEMGKDYIYAVTPLLEDALMDRDLVHRQTASAVVQHMSLGVY
GFGCEDSLNHLLNYVWPNVFETSPHVIQAVMGALEGLRVAIGPCRMLQYCLQGLFHPARK
VRDVYWKIYNSIYIGSQDALIAHYPRIYNDDKNTYIRYELDYIL

Sequence of entity 4 (D), FASTA

>7ONB_4 PHD finger-like domain-containing protein 5A (chains D)
MAKHHPDLIFCRKQAGVAIGRLCEKCDGKCVICDSYVRPCTLVRICDECNYGSYQGRCVI
CGGPGVSDAYYCKECTIQEKDRDGCPKIVNLGSSKTDLFYERKKYGFKKR

Sequence of entity 5 (F), FASTA

>7ONB_5 UNK (chains F)
AAAAARAARAAAWRAEQAAAA

Sequence of entity 6 (G), FASTA

>7ONB_6 MINX (chains G)
GGGCGCAGUAGUCCAGGGUUUCCUUGAUGAUGUCAUACUUAUCCUGUCCCUUUUUUUUCC
ACAGCUCGCGGUUGAGGACAAACUCUUCGCGGUCUUUCCACAGGUAAGUUGGAAGCAUGU
AGAACCUUGGAUCCGAUAUCCGUACACCAUCAGGGUACGAGCUAGCCCAUGGCGUACACC
AUCAGGGUACGACUAGUAGAUCUCGUACACCAUCAGGGUACGGAAUUCU

Sequence of entity 7 (H), FASTA

>7ONB_7 RNU2 (chains H)
AUCGCUUCUCGGCCUUUUGGCUAAGAUCAAGUGUAGUAUCUGUUCUUAUCAGUUUAAUAU
CUGAUACGUCCUCUAUCCGAGGACAAUAUAUUAAAUGGAUUUUUGGAGCAGGGAGAUGGA
AUAGGAGCUUGCUCCGUCCACUCCACGCAUCGACCUGGUAUUGCAGUACCUCCAGGAACG
GUGCACCC

Sequence of entity 8 (I), FASTA

>7ONB_8 Splicing factor 3B subunit 2 (chains I)
MATEHPEPPKAELQLPPPPPPGHYGAWAAQELQAKLAEIGAPIQGNREELVERLQSYTRQ
TGIVLNRPVLRGEDGDKAAPPPMSAQLPGIPMPPPPLGLPPLQPPPPPPPPPPGLGLGFP
MAHPPNLGPPPPLRVGEPVALSEEERLKLAQQQAALLMQQEERAKQQGDHSLKEHELLEQ
QKRAAVLLEQERQQEIAKMGTPVPRPPQDMGQIGVRTPLGPRVAAPVGPVGPTPTVLPMG
APVPRPRGPPPPPGDENREMDDPSVGPKIPQALEKILQLKESRQEEMNSQQEEEEMETDA
RSSLGQSASETEEDTVSVSKKEKNRKRRNRKKKKKPQRVRGVSSESSGDREKDSTRSRGS
DSPAADVEIEYVTEEPEIYEPNFIFFKRIFEAFKLTDDVKKEKEKEPEKLDKLENSAAPK
KKGFEEEHKDSDDDSSDDEQEKKPEAPKLSKKKLRRMNRFTVAELKQLVARPDVVEMHDV
TAQDPKLLVHLKATRNSVPVPRHWCFKRKYLQGKRGIEKPPFELPDFIKRTGIQEMREAL
QEKEEQKTMKSKMREKVRPKMGKIDIDYQKLHDAFFKWQTKPKLTIHGDLYYEGKEFETR
LKEKKPGDLSDELRISLGMPVGPNAHKVPPPWLIAMQRYGPPPSYPNLKIPGLNSPIPES
CSFGYHAGGWGKPPVDETGKPLYGDVFGTNAAEFQTKTEEEEIDRTPWGELEPSDEESSE
EEEEEESDEDKPDETGFITPADSGLITPGGFSSVPAGMETPELIELRKKKIEEAMDGSET
PQLFTVLPEKRTATVGGAMMGSTHIYDMSTVMSRKGPAPELQGVEVALAPEELELDPMAM
TQKYEEHVREQQAQVEKEDFSDMVAEHAAKQKQKKRKAQPQDSRGGSKKYKEFKF

Sequence of entity 9 (M), FASTA

>7ONB_9 Splicing factor 3A subunit 2 (chains M)
MDFQHRPGGKTGSGGVASSSESNRDRRERLRQLALETIDINKDPYFMKNHLGSYECKLCL
TLHNNEGSYLAHTQGKKHQTNLARRAAKEAKEAPAQPAPEKVKVEVKKFVKIGRPGYKVT
KQRDSEMGQQSLLFQIDYPEIAEGIMPRHRFMSAYEQRIEPPDRRWQYLLMAAEPYETIA
FKVPSREIDKAEGKFWTHWNRETKQFFLQFHFKMEKPPAPPSLPAGPPGVKRPPPPLMNG
LPPRPPLPESLPPPPPGGLPLPPMPPTGPAPSGPPGPPQLPPPAPGVHPPAPVVHPPASG
VHPPAPGVHPPAPGVHPPAPGVHPPTSGVHPPAPGVHPPAPGVHPPAPGVHPPAPGVHPP
APGVHPPPSAGVHPQAPGVHPAAPAVHPQAPGVHPPAPGMHPQAPGVHPQPPGVHPSAPG
VHPQPPGVHPSNPGVHPPTPMPPMLRPPLPSEGPGNIPPPPPTN

Sequence of entity 10 (N), FASTA

>7ONB_10 Splicing factor 3A subunit 3 (chains N)
METILEQQRRYHEEKERLMDVMAKEMLTKKSTLRDQINSDHRTRAMQDRYMEVSGNLRDL
YDDKDGLRKEELNAISGPNEFAEFYNRLKQIKEFHRKHPNEICVPMSVEFEELLKARENP
SEEAQNLVEFTDEEGYGRYLDLHDCYLKYINLKASEKLDYITYLSIFDQLFDIPKERKNA
EYKRYLEMLLEYLQDYTDRVKPLQDQNELFGKIQAEFEKKWENGTFPGWPKETSSALTHA
GAHLDLSAFSSWEELASLGLDRLKSALLALGLKCGGTLEERAQRLFSTKGKSLESLDTSL
FAKNPKSKGTKRDTERNKDIAFLEAQIYEYVEILGEQRHLTHENVQRKQARTGEEREEEE
EEQISESESEDEENEIIYNPKNLPLGWDGKPIPYWLYKLHGLNINYNCEICGNYTYRGPK
AFQRHFAEWRHAHGMRCLGIPNTAHFANVTQIEDAVSLWAKLKLQKASERWQPDTEEEYE
DSSGNVVNKKTYEDLKRQGLL

Sequence of entity 11 (K), FASTA

>7ONB_11 Splicing factor 3B subunit 4 (chains K)
MAAGPISERNQDATVYVGGLDEKVSEPLLWELFLQAGPVVNTHMPKDRVTGQHQGYGFVE
FLSEEDADYAIKIMNMIKLYGKPIRVNKASAHNKNLDVGANIFIGNLDPEIDEKLLYDTF
SAFGVILQTPKIMRDPDTGNSKGYAFINFASFDASDAAIEAMNGQYLCNRPITVSYAFKK
DSKGERHGSAAERLLAAQNPLSQADRPHQLFADAPPPPSAPNPVVSSLGSGLPPPGMPPP
GSFPPPVPPPGALPPGIPPAMPPPPMPPGAAGHGPPSAGTPGAGHPGHGHSHPHPFPPGG
MPHPGMSQMQLAHHGPHGLGHPHAGPPGSGGQPPPRPPPGMPHPGPPPMGMPPRGPPFGS
PMGHPGPMPPHGMRGPPPLMPPHGYTGPPRPPPYGYQRGPLPPPRPTPRPPVPPRGPLRG
PLPQ

Ligands and cofactors

ID	Name	Formula	Copies
SJT	spliceostatin A (form II)	C28 H45 N O8	1
ZN	Zinc ion	Zn	5

Primary citation

Structural basis of intron selection by U2 snRNP in the presence of covalent inhibitors. Cretu, C., Gee, P., Liu, X. et al. Nat Commun (2021) 12:4491-4491. DOI 10.1038/s41467-021-24741-1 · PubMed

Other PDB entries of the same protein (UniProt Q15393 (AlphaFold model), which also has an AlphaFold model), best resolution first:

7Q4O 2.1 Å, Substrate-bound A-like U2 snRNP
7Q4P 2.15 Å, U2 snRNP after ATP-dependent remodelling
7Q3L 2.21 Å, Human 17S U2 snRNP 5' domain
7B9C 2.4 Å, Structure of a minimal SF3B core in complex with spliceostatin A (form I)
9RDK 2.41 Å, Cryo-EM structure of the human SAGA co-activator complex
7EVO 2.5 Å, The cryo-EM structure of the human 17S U2 snRNP
7EVN 2.6 Å, The cryo-EM structure of the DDX42-SF3b complex
8H6L 2.6 Å, Cryo-EM structure of human exon-defined spliceosome in the early B state.
8H6K 2.7 Å, Cryo-EM structure of human exon-defined spliceosome in the mature B state.
8HK1 2.7 Å, The cryo-EM structure of human pre-17S U2 snRNP
7DVQ 2.89 Å, Cryo-EM Structure of the Activated Human Minor Spliceosome (minor Bact Complex)
7B0I 3.0 Å, Structure of a minimal SF3B core in complex with spliceostatin A (form II)

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