2025-12-17 REL PDBe INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY INITIAL_RELEASE REPOSITORY EXPERIMENTAL_SUMMARY em_admin _em_admin.last_update DATA_COLLECTION em_imaging _em_imaging.details DATA_COLLECTION em_image_scans em_imaging_optics em_software pdbx_audit_support _em_imaging_optics.energyfilter_name _em_software.name _pdbx_audit_support.funding_organization DERIVED_CALCULATIONS pdbx_unobs_or_zero_occ_atoms pdbx_validate_close_contact struct_conn DERIVED_CALCULATIONS pdbx_unobs_or_zero_occ_atoms pdbx_validate_close_contact struct_conn struct_conn_type OTHER atom_sites cell _atom_sites.fract_transf_matrix[1][1] _atom_sites.fract_transf_matrix[2][2] _atom_sites.fract_transf_matrix[3][3] _cell.Z_PDB STRUCTURE_SUMMARY atom_site chem_comp entity pdbx_entity_nonpoly pdbx_nonpoly_scheme pdbx_struct_conn_angle struct_conn struct_site _atom_site.B_iso_or_equiv _atom_site.Cartn_x _atom_site.Cartn_y _atom_site.Cartn_z _atom_site.auth_atom_id _atom_site.auth_comp_id _atom_site.label_atom_id _atom_site.label_comp_id _atom_site.pdbx_formal_charge _atom_site.type_symbol _chem_comp.id _chem_comp.name _chem_comp.pdbx_synonyms _entity.pdbx_description _pdbx_entity_nonpoly.comp_id _pdbx_entity_nonpoly.name _pdbx_nonpoly_scheme.mon_id _pdbx_nonpoly_scheme.pdb_mon_id _pdbx_struct_conn_angle.ptnr1_auth_seq_id _pdbx_struct_conn_angle.ptnr1_label_seq_id _pdbx_struct_conn_angle.ptnr2_auth_seq_id _pdbx_struct_conn_angle.ptnr2_label_asym_id _pdbx_struct_conn_angle.ptnr3_auth_seq_id _pdbx_struct_conn_angle.ptnr3_label_seq_id _pdbx_struct_conn_angle.value _struct_conn.pdbx_dist_value _struct_conn.ptnr1_label_atom_id _struct_conn.ptnr2_auth_seq_id _struct_conn.ptnr2_label_asym_id _struct_site.details _struct_site.pdbx_auth_comp_id STRUCTURE_SUMMARY chem_comp_atom chem_comp_bond database_2 em_admin pdbx_entry_details pdbx_modification_feature _database_2.pdbx_DOI _database_2.pdbx_database_accession _em_admin.last_update DATA_COLLECTION em_admin _em_admin.last_update PDBe PDBe 2016-12-19 2017-01-18 2017-01-18 2025-12-17 Medical Research Council (United Kingdom) MC_U105184330 United Kingdom European Research Council 693087 EMBO and Marie Sklodowska-Curie Fellowship Ref. S.M.Fica Fica SM Oubridge C pre-mRNA splicing, trans-esterification, lariat intermediate, complex C-star, Splicing Fica SM Oubridge C Galej WP Wilkinson ME Bai XC Newman AJ Nagai K Nature UK 542 377 380 2017 28076345 doi:10.1038/nature21078 1476-4687 0006 NATUAS Hang J Wan R Yan C Shi Y Science US 349 1191 1198 2015 26292705 doi:10.1126/science.aac8159 1095-9203 0038 SCIEAS Nguyen TH Galej WP Bai XC Savva CG Newman AJ Scheres SH Nagai K Nature UK 523 47 52 2015 26106855 doi:10.1038/nature14548 1476-4687 0006 NATUAS Nguyen TH Galej WP Bai XC Oubridge C Newman AJ Scheres SH Nagai K Nature UK 530 298 302 2016 26829225 doi:10.1038/nature16940 1476-4687 0006 NATUAS Galej WP Wilkinson ME Fica SM Oubridge C Newman AJ Nagai K Nature UK 537 197 201 2016 27459055 doi:10.1038/nature19316 1476-4687 0006 NATUAS 5mq0 FULLOVERLAP PDB 5MPS unspecified

Coordinates of Saccharomyces cerevisiae spliceosome C-star complex core, refined

EMDB EMD-3541 associated EM volume

Structure of a spliceosome remodeled for exon ligation

Saccharomyces cerevisiae spliceosome. Complex C just after Prp16-mediated remodeling Saccharomyces cerevisiae spliceosome. Complex C just after Prp16-mediated remodeling 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Splicing extract was prepared from Slu7-TAPS yeast strains. An in vitro transcribed yeast UBC4 pre-mRNA substrate (with 2 x MS2 bacteriophage coat protein-binding stem loops at the 5' end and with a 2'-deoxy substitution at the 3'-splice site sequence UAG sequence (UA-2'dG) was pre-bound to an MS2-maltose binding protein fusion protein. This substrate-protein complex was added to the splicing extract. The splicing reaction proceeded through the first step but the second step was blocked by the deoxy substitution. Substrate-bound spliceosomes from the splicing extract were purified on amylose resin and eluted with maltose. Subsequently the spliceosomes were captured on streptactin resin and eluted with desthiobiotin. Purified spliceosomes were concentrated in 20 mM HEPES KOH pH 7.9, 100 mM KCl, 0.25 mM EDTA.

Yeast UBC4 gene for ubiquitin-conjugating enzyme Saccharomyces cerevisiae 0.03020073 1 GUAUGUCUAAAGUUAUGGCCACGUUUCAAAUGCGUGCUUUUUUUUUAAAACUUAUGCUCUUAUUUACUAACAAAAUCAAC AUGCUAUUGAACUAG X17493.1 5'-EXON OF UBC4 PRE-MRNA Saccharomyces cerevisiae 0.006518975999999999 1 GAAGUAAGUGAUCUAGAAAG S.cerevisiae chromosome II reading frame ORF YBR230c Saccharomyces cerevisiae 0.376267406 1 ACGAAUCUCUUUGCCUUUUGGCUUAGAUCAAGUGUAGUAUCUGUUCUUUUCAGUGUAACAACUGAAAUGACCUCAAUGAG GCUCAUUACCUUUUAAUUUGUUACAAUACACAUUUUUUGGCACCCAAAAUAAUAAAAUGGACGGGAAGAGACUUUUUAAG CAAGUUGUUUUCCGCUAAUGUCAGGUCUCACUACUUUUUGCUGCUAUUUUUCUUCGCUCAUGGUUUCUUCAUAAGGCGUU UUUAUGAUGGUUUUUCGAAAUUGGUUUUUGAGACGACGGUUGCUCAAGGUUAUUGUUUUUGUUUUCUUCUGGUUGUUUUC UAUUUUCUUUUUUUUAGCUUUCUGUUUCUCCCUUAGUUUGGCUUUUUGCUUCAUACUCUUCCCUGUCUUUCCGAGCCGUU UAUGUCCAACGCGGGAUUUGGUUUUUCUUUAUCGAUGGGAAGAAAUGGUGCUAUAGUAGGUUGGGAGAUAAUAUUUAUGG UAUGGGGUGCUAGUGCGGAUGGGGCGCUCUUAUUGUUGAUUUCUUCGCUCGUCUUCUUUUUCUGGUGGCGCUGCAAGAGG AAGUUUUUCGACUUUGUUAUGAUUUUUGGUUUGCAAGGAAAGGUGUCUUACGAUUCUUUUUUUGAUGUAAUAGGAUAAGC UUGCUUAUCCCCCAAGUAUCGGCCAAAGUUGUUGAUUUUCCUUUUGAAGUGUCCUCGGUUUGAGGGGGUGUAGGGUGGGG UUGGUCUACAAUAAGAGUGUUCCAUUGUUAACGUGCUGGCGUCUUUUACUAUAUUUUUUUUCCCAGUUUAUUUUGUGCUU AUUUUCUCAUUGAGGAGAAGGAGCUCUUCUCGCAGGAUAUAAAUGGAGGUUUGCUAAAGGGGAGGAGAUGUGUUUGUGAG AAUACUGCUGAGAGAGUUCUGGAAGAGAAAAAAAGGAGGCAAUGGAAGGCGUUUGCUGGGAAAAGAGAAGAGCCAUGACU GCAUCUGUUGUUUCAAGGCCAGUUUUAUUAACCGCCUAUGUCAUAGAGGCGUUUUUUUUGGAGGGAUUUGAAGAAUGCCG GCGGCAUCAAGAAACGGACUUGAUGGUUGACGCCUGUUUUUAAAGUUAGAGACGUCGCGACCCUCGCACUUGUGGAGUCG UUCUUGACUUUUACUUUGGUCGCUUGAUGUUUCUCUCGUCUUCCCGUUCGCUCUU Z36099.1 Saccharomyces cerevisiae strain T.52_2H chromosome XII sequence Saccharomyces cerevisiae 0.035883175999999996 1 GUUCGCGAAGUAACCCUUCGUGGACAUUUGGUCAAUUUGAAACAAUACAGAGAUGAUCAGCAGUUCCCCUGCAUAAGGAU GAACCGUUUUACAAAGAGAUUUAUUUCGUUUU CP007856.1 Saccharomyces cerevisiae strain WI_C_MBSP_4 chromosome VII sequence Saccharomyces cerevisiae 0.057444875 1 AAGCAGCUUUACAGAUCAAUGGCGGAGGGAGGUCAACAUCAAGAACUGUGGGCCUUUUAUUGCCUAUAGAACUUAUAACG AACAUGGUUCUUGCCUUUUACCAGAACCAUCCGGGUGUUGUCUCCAUAGAAACAGGUAAAGCUGUCCGUUACUGUGGGCU UGCCAUAUUUUUUGGAACU CP008514.1 Pre-mRNA-splicing factor 8 Saccharomyces cerevisiae 0.279867469 1 LEVO MSGLPPPPPGFEEDSDLALPPPPPPPPGYEIEELDNPMVPSSVNEDTFLPPPPPPPSNFEINAEEIVDFTLPPPPPPPGL DELETKAEKKVELHGKRKLDIGKDTFVTRKSRKRAKKMTKKAKRSNLYTPKAEMPPEHLRKIINTHSDMASKMYNTDKKA FLGALKYLPHAILKLLENMPHPWEQAKEVKVLYHTSGAITFVNETPRVIEPVYTAQWSATWIAMRREKRDRTHFKRMRFP PFDDDEPPLSYEQHIENIEPLDPINLPLDSQDDEYVKDWLYDSRPLEEDSKKVNGTSYKKWSFDLPEMSNLYRLSTPLRD EVTDKNYYYLFDKKSFFNGKALNNAIPGGPKFEPLYPREEEEDYNEFNSIDRVIFRVPIRSEYKVAFPHLYNSRPRSVRI PWYNNPVSCIIQNDEEYDTPALFFDPSLNPIPHFIDNNSSLNVSNTKENGDFTLPEDFAPLLAEEEELILPNTKDAMSLY HSPFPFNRTKGKMVRAQDVALAKKWFLQHPDEEYPVKVKVSYQKLLKNYVLNELHPTLPTNHNKTKLLKSLKNTKYFQQT TIDWVEAGLQLCRQGHNMLNLLIHRKGLTYLHLDYNFNLKPTKTLTTKERKKSRLGNSFHLMRELLKMMKLIVDTHVQFR LGNVDAFQLADGIHYILNHIGQLTGIYRYKYKVMHQIRACKDLKHIIYYKFNKNLGKGPGCGFWQPAWRVWLNFLRGTIP LLERYIGNLITRQFEGRSNEIVKTTTKQRLDAYYDLELRNSVMDDILEMMPESIRQKKARTILQHLSEAWRCWKANIPWD VPGMPAPIKKIIERYIKSKADAWVSAAHYNRERIKRGAHVEKTMVKKNLGRLTRLWIKNEQERQRQIQKNGPEITPEEAT TIFSVMVEWLESRSFSPIPFPPLTYKNDTKILVLALEDLKDVYASKVRLNASEREELALIEEAYDNPHDTLNRIKKYLLT QRVFKPVDITMMENYQNISPVYSVDPLEKITDAYLDQYLWYEADQRKLFPNWIKPSDSEIPPLLVYKWTQGINNLSEIWD VSRGQSAVLLETTLGEMAEKIDFTLLNRLLRLIVDPNIADYITAKNNVVINFKDMSHVNKYGLIRGLKFASFIFQYYGLV IDLLLLGQERATDLAGPANNPNEFMQFKSKEVEKAHPIRLYTRYLDRIYMLFHFEEDEGEELTDEYLAENPDPNFENSIG YNNRKCWPKDSRMRLIRQDVNLGRAVFWEIQSRVPTSLTSIKWENAFVSVYSKNNPNLLFSMCGFEVRILPRQRMEEVVS NDEGVWDLVDERTKQRTAKAYLKVSEEEIKKFDSRIRGILMASGSTTFTKVAAKWNTSLISLFTYFREAIVATEPLLDIL VKGETRIQNRVKLGLNSKMPTRFPPAVFYTPKELGGLGMISASHILIPASDLSWSKQTDTGITHFRAGMTHEDEKLIPTI FRYITTWENEFLDSQRVWAEYATKRQEAIQQNRRLAFEELEGSWDRGIPRISTLFQRDRHTLAYDRGHRIRREFKQYSLE RNSPFWWTNSHHDGKLWNLNAYRTDVIQALGGIETILEHTLFKGTGFNSWEGLFWEKASGFEDSMQFKKLTHAQRTGLSQ IPNRRFTLWWSPTINRANVYVGFLVQLDLTGIFLHGKIPTLKISLIQIFRAHLWQKIHESIVFDICQILDGELDVLQIES VTKETVHPRKSYKMNSSAADITMESVHEWEVSKPSLLHETNDSFKGLITNKMWFDVQLRYGDYDSHDISRYVRAKFLDYT TDNVSMYPSPTGVMIGIDLAYNMYDAYGNWFNGLKPLIQNSMRTIMKANPALYVLRERIRKGLQIYQSSVQEPFLNSSNY AELFNNDIKLFVDDTNVYRVTVHKTFEGNVATKAINGCIFTLNPKTGHLFLKIIHTSVWAGQKRLSQLAKWKTAEEVSAL VRSLPKEEQPKQIIVTRKAMLDPLEVHMLDFPNIAIRPTELRLPFSAAMSIDKLSDVVMKATEPQMVLFNIYDDWLDRIS SYTAFSRLTLLLRALKTNEESAKMILLSDPTITIKSYHLWPSFTDEQWITIESQMRDLILTEYGRKYNVNISALTQTEIK DIILGQNIKAPSVKRQKMAELEAARSEKQNDEEAAGASTVMKTKTINAQGEEIVVVASADYESQTFSSKNEWRKSAIANT LLYLRLKNIYVSADDFVEEQNVYVLPKNLLKKFIEISDVKIQVAAFIYGMSAKDHPKVKEIKTVVLVPQLGHVGSVQISN IPDIGDLPDTEGLELLGWIHTQTEELKFMAASEVATHSKLFADKKRDCIDISIFSTPGSVSLSAYNLTDEGYQWGEENKD IMNVLSEGFEPTFSTHAQLLLSDRITGNFIIPSGNVWNYTFMGTAFNQEGDYNFKYGIPLEFYNEMHRPVHFLQFSELAG DEELEAEQIDVFS P33334 Pre-mRNA-splicing factor SNU114 Saccharomyces cerevisiae 0.114174008 1 LEVO MEGDDLFDEFGNLIGVDPFDSDEEESVLDEQEQYQTNTFEGSGNNNEIESRQLTSLGSKKELGISLEHPYGKEVEVLMET KNTQSPQTPLVEPVTERTKLQEHTIFTQLKKNIPKTRYNRDYMLSMANIPERIINVGVIGPLHSGKTSLMDLLVIDSHKR IPDMSKNVELGWKPLRYLDNLKQEIDRGLSIKLNGSTLLCTDLESKSRMINFLDAPGHVNFMDETAVALAASDLVLIVID VVEGVTFVVEQLIKQSIKNNVAMCFVINKLDRLILDLKLPPMDAYLKLNHIIANINSFTKGNVFSPIDNNIIFASTKLGF TFTIKEFVSYYYAHSIPSSKIDDFTTRLWGSVYYHKGNFRTKPFENVEKYPTFVEFILIPLYKIFSYALSMEKDKLKNLL RSNFRVNLSQEALQYDPQPFLKHVLQLIFRQQTGLVDAITRCYQPFELFDNKTAHLSIPGKSTPEGTLWAHVLKTVDYGG AEWSLVRIYSGLLKRGDTVRILDTSQSESRQKRQLHDISKTETSNEDEDEDDETPSCEVEEIGLLGGRYVYPVHEAHKGQ IVLIKGISSAYIKSATLYSVKSKEDMKQLKFFKPLDYITEAVFKIVLQPLLPRELPKLLDALNKISKYYPGVIIKVEESG EHVILGNGELYMDCLLYDLRASYAKIEIKISDPLTVFSESCSNESFASIPVSNSISRLGEENLPGLSISVAAEPMDSKMI QDLSRNTLGKGQNCLDIDGIMDNPRKLSKILRTEYGWDSLASRNVWSFYNGNVLINDTLPDEISPELLSKYKEQIIQGFY WAVKEGPLAEEPIYGVQYKLLSISVPSDVNIDVMKSQIIPLMKKACYVGLLTAIPILLEPIYEVDITVHAPLLPIVEELM KKRRGSRIYKTIKVAGTPLLEVRGQVPVIESAGFETDLRLSTNGLGMCQLYFWHKIWRKVPGDVLDKDAFIPKLKPAPIN SLSRDFVMKTRRRKGISTGGFMSNDGPTLEKYISAELYAQLRENGLVP P36048 Pre-mRNA-splicing factor CWC22 Saccharomyces cerevisiae 0.067386062 1 LEVO MSTATIQDEDIKFQRENWEMIRSHVSPIISNLTMDNLQESHRDLFQVNILIGRNIICKNVVDFTLNKQNGRLIPALSALI ALLNSDIPDIGETLAKELMLMFVQQFNRKDYVSCGNILQCLSILFLYDVIHEIVILQILLLLLEKNSLRLVIAVMKICGW KLALVSKKTHDMIWEKLRYILQTQELSSTLRESLETLFEIRQKDYKSGSQGLFILDPTSYTVHTHSYIVSDEDEANKELG NFEKCENFNELTMAFDTLRQKLLINNTSDTNEGSNSQLQIYDMTSTNDVEFKKKIYLVLKSSLSGDEAAHKLLKLKIANN LKKSVVDIIIKSSLQESTFSKFYSILSERMITFHRSWQTAYNETFEQNYTQDIEDYETDQLRILGKFWGHLISYEFLPMD CLKIIKLTEEESCPQGRIFIKFLFQELVNELGLDELQLRLNSSKLDGMFPLEGDAEHIRYSINFFTAIGLGLLTEDMRSR LTIIQEVEDAEEEEKKLREEEELEKLRKKARESQPTQGPKIHESRLFLQKDTRENSRSRSPFTVETRKRARSRTPPRGSR NHRNRSRTPPARRQRHR P53333 Pre-mRNA-splicing factor PRP46 Saccharomyces cerevisiae 0.050771289 1 LEVO MDGNDHKVENLGDVDKFYSRIRWNNQFSYMATLPPHLQSEMEGQKSLLMRYDTYRKESSSFSGEGKKVTLQHVPTDFSEA SQAVISKKDHDTHASAFVNKIFQPEVAEELIVNRYEKLLSQRPEWHAPWKLSRVINGHLGWVRCVAIDPVDNEWFITGSN DTTMKVWDLATGKLKTTLAGHVMTVRDVAVSDRHPYLFSVSEDKTVKCWDLEKNQIIRDYYGHLSGVRTVSIHPTLDLIA TAGRDSVIKLWDMRTRIPVITLVGHKGPINQVQCTPVDPQVVSSSTDATVRLWDVVAGKTMKVLTHHKRSVRATALHPKE FSVASACTDDIRSWGLAEGSLLTNFESEKTGIINTLSINQDDVLFAGGDNGVLSFYDYKSGHKYQSLATREMVGSLEGER SVLCSTFDKTGLRLITGEADKSIKIWKQDETATKESEPGLAWNPNLSAKRF Q12417 Pre-mRNA-processing protein 45 Saccharomyces cerevisiae 0.042548726999999995 1 LEVO MFSNRLPPPKHSQGRVSTALSSDRVEPAILTDQIAKNVKLDDFIPKRQSNFELSVPLPTKAEIQECTARTKSYIQRLVNA KLANSNNRASSRYVTETHQAPANLLLNNSHHIEVVSKQMDPLLPRFVGKKARKVVAPTENDEVVPVLHMDGSNDRGEADP NEWKIPAAVSNWKNPNGYTVALERRVGKALDNENNTINDGFMKLSEALENADKKARQEIRSKMELKRLAMEQEMLAKESK LKELSQRARYHNGTPQTGAIVKPKKQTSTVARLKELAYSQGRDVSEKIILGAAKRSEQPDLQYDSRFFTRGANASAKRHE DQVYDNPLFVQQDIESIYKTNYEKLDEAVNVKSEGASGSHGPIQFTKAESDDKSDNYGA P28004 Pre-mRNA-splicing factor BUD31 Saccharomyces cerevisiae 0.018484502 1 LEVO MPRIKTRRSKPAPDGFEKIKPTLTDFEIQLRDAQKDKSSKLAAKSNEQLWEIMQLHHQRSRYIYTLYYKRKAISKDLYDW LIKEKYADKLLIAKWRKTGYEKLCCLRCIQKNETNNGSTCICRVPRAQLEEEARKKGTQVSFHQCVHCGCRGCASTD P25337 Pre-mRNA-splicing factor CWC2 Saccharomyces cerevisiae 0.038486561999999995 1 LEVO MTSWRDKSAKVQVKESELPSSIPAQTGLTFNIWYNKWSQGFAGNTRFVSPFALQPQLHSGKTRGDNDGQLFFCLFFAKGM CCLGPKCEYLHHIPDEEDIGKLALRTEVLDCFGREKFADYREDMGGIGSFRKKNKTLYVGGIDGALNSKHLKPAQIESRI RFVFSRLGDIDRIRYVESKNCGFVKFKYQANAEFAKEAMSNQTLLLPSDKEWDDRREGTGLLVKWANEDPDPAAQKRLQE ELKLESLNMMVHLINNNTNSAGTEVNNKNNERLDRTFPEASVDNVKKRLLPLDNGMESDDFIEKLKKVKKNISRENISSK PSVGKLGGPLLDYLSSDED Q12046 Pre-mRNA-splicing factor SLT11 Saccharomyces cerevisiae 0.04098858999999999 1 LEVO MNDEINEPPPNICEQCLGDEANIRMTKIPQGSECKICTLPFTLYHFKTSKRSNNIIKTLICVRCATQRNICQCCMLDSRW HIPIQLRDHLISLVNEENVMTEEAKNDMMKRFLSLKNVKLGGAQITSDPSEADNIVDKLKNILLRATSDGPSTPLIKNTT ALYKNEKGANEVKNLEKYASVDISHILKKLPLNESFLKNPSTKSFFLYNIDASIPEWKITDTVSQLLGIKKWKDGNSLSL IVNHKAKCGGLRFQSSELGERFVSKISETLVTPKGLKRGVLLIDRFRIFIIPWSSGFSAASFGTNTAENIKLSLSLNKLI QLELGLSFPTKSTDNAKNDKKKTSKKVHKDRSKKSKPRANKLTI P38241 Pre-mRNA-splicing factor CEF1 Saccharomyces cerevisiae 0.067837773 1 LEVO MPPVPIYVKGGVWTNVEDQILKAAVQKYGTHQWSKVASLLQKKTARQSELRWNEYLNPKLNFTEFSKEEDAQLLDLAREL PNQWRTIADMMARPAQVCVERYNRLLESEDSGGAALSTGVTDLKAGDINPNAETQMARPDNGDLEDEEKEMLAEARARLL NTQGKKATRKIRERMLEESKRIAELQKRRELKQAGINVAIKKPKKKYGTDIDYNEDIVYEQAPMPGIYDTSTEDRQIKKK FEQFERKVNRKGLDGNKDKPSKKNKDKKRKHDENEHVEKAALGESTTLTDEYKKPKLILSAPGTKQGKVTYKKKLESKRQ KLIEAQATGTVLTPKELLPHDSGQEDNERSNIKSGKQLKSRIRKFLVQMFASLPSPKNDFEIVLSEDEKEEDAEIAEYEK EFENERAMNEEDNFIEPPSQNDAPRVSLVAVPLAYSTLPIPEFKNNPQSAIDNKYNLLVANAINKEPHMVPEDTVDFLKE VESRMQHITQGRTSMKIQFKTAMPPTEVLLESIQSKVESIEQLQRKLQHVQPLEQQNNEMCSTLCHHSLPALIEGQRKYY ADYYAYRQEIRSLEGRRKRLQAMLNSSSSI Q03654 Pre-mRNA-splicing factor CWC15 Saccharomyces cerevisiae 0.019975194999999998 1 LEVO MTTSHRPQLEARSGAKAAAYTPTGIEHARLLPGHTTLKYRKFKEEENLRANCAQEDRSNDKSLEEAVMNEEKQDVVGSGN LQETRSEKDQKDSLQELLVTQKNKVEDKAELEGNEQLKGGNSSRRSWRKGTAFGRHKVTKETNIKEHATKKSASGYINDM TKSEYHQEFLHKHVR Q03772 Pre-mRNA-splicing factor CWC21 Saccharomyces cerevisiae 0.015793596 1 LEVO MSYNGIGLKSAKGSSTSGHVQRSLASNNRRRPQGSQQQRQQRQNAIKKASHDKASRPLAVQKQIETHMEKREIEVQVSEL RDRLEEEETLSEEQIDKKCEALRAKLTNEWQEQQRMSSLYTPRKARLTEEQHRHE Q03375 Pre-mRNA-splicing factor CLF1 Saccharomyces cerevisiae 0.082555859 1 LEVO MDTLEPTAVDTHVSAEQILRDVYKKGQKARGSTNIDILDLEELREYQRRKRTEYEGYLKRNRLDMGQWIRYAQFEIEQHD MRRARSIFERALLVDSSFIPLWIRYIDAELKVKCINHARNLMNRAISTLPRVDKLWYKYLIVEESLNNVEIVRSLYTKWC SLEPGVNAWNSFVDFEIRQKNWNGVREIYSKYVMAHPQMQTWLKWVRFENRHGNTEFTRSVYSLAIDTVANLQNLQIWSD MEVAKLVNSFAHWEAAQQEYERSSALYQIAIEKWPSNQLLKAGLLDFEKQFGDINSIEETISYKRKMEYETILSNNAYDY DTWWLYLDLISESFPKQIMQTFEKAIVDSRPKELSKNVQWKRYIYLWMRYICYVELELENSLLEEELFQRLIDDIIPHKH FTFSKIWLMYAKFLIRHDDVPKARKILGKAIGLCPKAKTFKGYIELEVKLKEFDRVRKIYEKFIEFQPSDLQIWSQYGEL EENLGDWDRVRGIYTIALDENSDFLTKEAKIVLLQKYITFETESQEFEKARKLYRRYLELNQYSPQSWIEFAMYQTSTPT EQQLLDLAKLQSENVDEDIEFEITDENKLEARKVFEEAIVFFKEKDDKQGRLSILEALKDYEETYGTELDQETVKKRFPK VIKKVRLQNGVEEEFVDYIFPDDIDDDKPKPSKFLELAKKWKQEQAL Q12309 Pre-mRNA-splicing factor SYF1,PRE-MRNA-SPLICING FACTOR SYF1 Saccharomyces cerevisiae 0.10187585199999999 1 LEVO MSAYIAMKGVITNVDENIRNDEDVAFEYEIQKTPQNILTWKRYIEYWKEEGRTDKQIRWLYERFCSQFVTDTSIWEDYIR WESTKEVVETSRIFWLFQRCLKSCVRDCDRICLSYLELAIEQYDLAMIRHALASSLMKMEREMHRKVWDPVIKFVEEKVL PLTQLDSTQEDEEESTDEAELINVLLVKGFTKGGFISEEISENGSRGDIWSSHILERYLKVAPQQKRNESLATLALTRDN ITIKSVYEKYLPQDENSGKYLPSSELPFELNFNYLASLEKLGLDNQYEEFMRQMNGIYPDKWLFLILSLAKYYISRGRLD SCGDLLKKSLQQTLRYSDFDRIYNFYLLFEQECSQFILGKLKENDSKFFNQKDWTEKLQAHMATFESLINLYDIYLNDVA LRQDSNLVETWMKRVSLQKSAAEKCNVYSEAILKIDPRKVGTPGSFGRLWCSYGDLYWRSNAISTARELWTQSLKVPYPY IEDLEEIYLNWADRELDKEGVERAFSILEDALHVPTNPEILLEKYKNGHRKIPAQTVLFNSLRIWSKYIDYLEAYCPKDA NSSDKIFNKTKMAYNTVIDLRLITPAMAENFALFLQNHYEVMESFQVYEKTIPLFPPEIQYELWIEYLEVATSHQLSSLS PEHIRFLFEKALKNLCSNGIDCKTIFIAYSVFEERISGLISKSIEILRRGAVIGTVSVSTHLESRLQLWRMCISKAESTL GPSVTRELYQECIQILPNSKAVEFVIKFSDFESSIGETIRAREILAYGAKLLPPSRNTELWDSFEIFELKHGDKETYKDM LKMKKVLESNMLIDSASVSHEEGNINFVAAATSHAPNSHTLTQSTSSYSINPDEIELDI(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) Q04048 Pre-mRNA-splicing factor 18 Saccharomyces cerevisiae 0.028414390999999997 1 LEVO MDLDLASILKGEISKKKKELANSKGVQPPCTEKFQPHESANIDETPRQVEQESTDEENLSDNQSDDIRTTISKLENRPER IQEAIAQDKTISVIIDPSQIGSTEGKPLLSMKCNLYIHEILSRWKASLEAYHPELFLDTKKALFPLLLQLRRNQLAPDLL ISLATVLYHLQQPKEINLAVQSYMKLSIGNVAWPIGVTSVGIHARSAHSKIQGGRNAANIMIDERTRLWITSIKRLITFE EWYTSNHDSLA P33411 Pre-mRNA-splicing factor SLU7 Saccharomyces cerevisiae 0.044722874999999995 1 LEVO MNNNSRNNENRSTINRNKRQLQQAKEKNENIHIPRYIRNQPWYYKDTPKEQEGKKPGNDDTSTAEGGEKSDYLVHHRQKA KGGALDIDNNSEPKIGMGIKDEFKLIRPQKMSVRDSHSLSFCRNCGEAGHKEKDCMEKPRKMQKLVPDLNSQKNNGTVLV RATDDDWDSRKDRWYGYSGKEYNELISKWERDKRNKIKGKDKSQTDETLWDTDEEIELMKLELYKDSVGSLKKDDADNSQ LYRTSTRLREDKAAYLNDINSTESNYDPKSRLYKTETLGAVDEKSKMFRRHLTGEGLKLNELNQFARSHAKEMGIRDEIE DKEKVQHVLVANPTKYEYLKKKREQEETKQPKIVSIGDLEARKVDGTKQSEEQRNHLKDLYG Q02775 Pre-mRNA-processing factor 17 Saccharomyces cerevisiae 0.052128762 1 LEVO MGLVDGYDTSSDSDLNFDEGKSVHEKKNGNLHEDTSYEPSSNNIHKRKSHFTKSELKRRRKTRKGDGPWGSWSSSDDETS QASETQKEDQDIFVHALAEDNLDSEQIEVEEVSHFYGKSEKDYQGRGYLYPPNDVDVDLREERISFRCYLPKKVIRNYPG HPEGTTALKFLPKTGHLILSGGNDHTIKIWDFYHDYECLRDFQGHNKPIKALRFTEDCQSFLSSSFDRSVKIWDTETGKV KTRLHLNSTPADVESRPTNPHEFIVGLSNSKILHYDDRVSENQGLVQTYDHHLSSILALKYFPDGSKFISSSEDKTVRIW ENQINVPIKQISDTAQHSMPFLNVHPSQNYFCAQSMDNRIYSFSLKPKYKRHPKKIFKGHSSAGYGISLAFSGDGRYICS GDSKSRLFTWDWNTSRLLNNIKIPGNKPITQVDWHPQETSKVICSGAAGKIYVCD P40968 UNKNOWN PROTEIN Saccharomyces cerevisiae 0.005805147 1 LEVO (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK) Pre-mRNA-splicing factor SYF2 Saccharomyces cerevisiae 0.024850719 1 LEVO MDFYKLDEKLKELKRKRVDVSIKSRKLADREIQEVSANRKPRVYSMEDVNDADESVGDTESPEKEKAFHYTVQEYDAWER RHPQGKTGQSQRGGISYDQLAKLSYEKTLRNLATQTQNSSKQDSSADEEDNKNVPKKGRIGKVQKDTKTGKITIADDDKL VNKLAVSLQSESKKRYEARKRQMQNAKTLYGVESFINDKNKQFNEKLSRESKGSE P53277 Small nuclear ribonucleoprotein-associated protein B Saccharomyces cerevisiae 0.02242699 2 LEVO MSKIQVAHSSRLANLIDYKLRVLTQDGRVYIGQLMAFDKHMNLVLNECIEERVPKTQLDKLRPRKDSKDGTTLNIKVEKR VLGLTILRGEQILSTVVEDKPLLSKKERLVRDKKEKKQAQKQTKLRKEKEKKPGKIAKPNTANAKHTSSNSREIAQPSSS RYNGGNDNIGANRSRFNNEAPPQTRKFQPPPGFKRK P40018 Small nuclear ribonucleoprotein Sm D3 Saccharomyces cerevisiae 0.011240138999999998 2 LEVO MTMNGIPVKLLNEAQGHIVSLELTTGATYRGKLVESEDSMNVQLRDVIATEPQGAVTHMDQIFVRGSQIKFIVVPDLLKN APLFKKNSSRPMPPIRGPKRR P43321 Small nuclear ribonucleoprotein E Saccharomyces cerevisiae 0.010385097999999999 2 LEVO MSNKVKTKAMVPPINCIFNFLQQQTPVTIWLFEQIGIRIKGKIVGFDEFMNVVIDEAVEIPVNSADGKEDVEKGTPLGKI LLKGDNITLITSAD Q12330 Small nuclear ribonucleoprotein F Saccharomyces cerevisiae 0.009669945 2 LEVO MSESSDISAMQPVNPKPFLKGLVNHRVGVKLKFNSTEYRGTLVSTDNYFNLQLNEAEEFVAGVSHGTLGEIFIRCNNVLY IRELPN P54999 Small nuclear ribonucleoprotein G Saccharomyces cerevisiae 0.008490808999999998 2 LEVO MVSTPELKKYMDKKILLNINGSRKVAGILRGYDIFLNVVLDDAMEINGEDPANNHQLGLQTVIRGNSIISLEALDAI P40204 Small nuclear ribonucleoprotein Sm D1 Saccharomyces cerevisiae 0.016296798 2 LEVO MKLVNFLKKLRNEQVTIELKNGTTVWGTLQSVSPQMNAILTDVKLTLPQPRLNKLNSNGIAMASLYLTGGQQPTASDNIA SLQYINIRGNTIRQIILPDSLNLDSLLVDQKQLNSLRRSGQIANDPSKKRRRDFGAPANKRPRRGL Q02260 Small nuclear ribonucleoprotein Sm D2 Saccharomyces cerevisiae 0.012876066 2 LEVO MSSQIIDRPKHELSRAELEELEEFEFKHGPMSLINDAMVTRTPVIISLRNNHKIIARVKAFDRHCNMVLENVKELWTEKK GKNVINRERFISKLFLRGDSVIVVLKTPVE Q06217 Pre-mRNA-splicing factor ATP-dependent RNA helicase PRP22 Saccharomyces cerevisiae 0.130187359 1 LEVO MSDISKLIGAIVGSDDPVIIEFVLNIINKSGNLQEFIRNIQKLDAGISYEDSIKMYNAFLGKQEEEKVRNKVKSSPLSQK INQVLKDDVNLDDPVVTEFVLSILNKSKSITEFQEQLNLMQSGLDNETIFKIYQIASPPVMKEEVSVLPSTKIPAKIEAK IEEEVQKIESLDPSPVLHKVYEGKVRNITTFGCFVQIFGTRMKNCDGLVHISEMSDQRTLDPHDVVRQGQHIFVEVIKIQ NNGKISLSMKNIDQHSGEIRKRNTESVEDRGRSNDAHTSRNMKNKIKRRALTSPERWEIRQLIASGAASIDDYPELKDEI PINTSYLTAKRDDGSIVNGNTEKVDSKLEEQQRDETDEIDVELNTDDGPKFLKDQQVKGAKKYEMPKITKVPRGFMNRSA INGSNAIRDHREEKLRKKREIEQQIRKQQSFDDPTKNKKDSRNEIQMLKNQLIVTEWEKNRMNESISYGKRTSLPISAQR QTLPVYAMRSELIQAVRDNQFLVIVGETGSGKTTQITQYLDEEGFSNYGMIGCTQPRRVAAVSVAKRVAEEVGCKVGHDV GYTIRFEDVTGPDTRIKYMTDGMLQREALLDPEMSKYSVIMLDEAHERTVATDVLFALLKKAAIKRPELKVIVTSATLNS AKFSEYFLNCPIINIPGKTFPVEVLYSQTPQMDYIEAALDCVIDIHINEGPGDILVFLTGQEEIDSCCEILYDRVKTLGD SIGELLILPVYSALPSEIQSKIFEPTPKGSRKVVFATNIAETSITIDGIYYVVDPGFAKINIYNARAGIEQLIVSPISQA QANQRKGRAGRTGPGKCYRLYTESAFYNEMLENTVPEIQRQNLSHTILMLKAMGINDLLKFDFMDPPPKNLMLNALTELY HLQSLDDEGKLTNLGKEMSLFPMDPTLSRSLLSSVDNQCSDEIVTIISMLSVQNVFYRPKDRQLEADSKKAKFHHPYGDH LTLLNVYTRWQQANYSEQYCKTNFLHFRHLKRARDVKSQISMIFKKIGLKLISCHSDPDLIRKTFVSGFFMNAAKRDSQV GYKTINGGTEVGIHPSSSLYGKEYEYVMYHSIVLTSREYMSQVTSIEPQWLLEVAPHFYKAGDAESQSRKKAKIIPLHNK FAKDQNSWRLSSIRQSRERALGIKR P24384 3.6.4.13 U2 small nuclear ribonucleoprotein A' Saccharomyces cerevisiae 0.027232252 1 LEVO MKFTPSIVIDAPQYYVDHFNGKYNVDKCVILRDLQLETDSESMPSSLKHLTKPTHILDLTNNDLIMIPDLSRRDDIHTLL LGRNNIVEVDGRLLPMNVQNLTLSNNSIRRFEDLQRLRRAPRTLKNLTLIGNQVCHLANYREHVLRLVPHLETLDFQNVT AEERKSAMSFPRQADGDTLGPVNTAIRDNGSRDKTMEIMNLVVSKMTVERRNELKKQLAEATSLEEIARLEKLLSGGV Q08963 U2 small nuclear ribonucleoprotein B'' Saccharomyces cerevisiae 0.012850944 1 LEVO MVEPARKKQRIDRDTHHTVAEPVTEAKNTLYVSQLNEKINMQRLRVNLFLLFATFGEVLKVSMNFKKQRGQAFITMRTID QASLAQISLNGERFFGKPLKVEFSKSETKTL P40567 3'-EXON OF UBC4 PRE-MRNA, BOUND BY PRP22 HELICASE Saccharomyces cerevisiae 0.0008735399999999999 1 UUU Pre-mRNA-splicing factor SNT309 Saccharomyces cerevisiae 0.020741455000000002 1 LEVO MDGLSFVDKGKIPDGYKNEIDQLVKKEFANIKREPVHPEIRGILAKRKGADNSVSTLTNALYTEYLKQRNNKKRRTPDFN DDDDTLFLEEYRRKYPRIDTSRYIPNESSEVSLLGIVDSYLKHQEIVLDTLLPQTVSNQWRINNDYIRQTCTIVEEMNIQ QRKQINDLEIYRKRL Q06091 Pre-mRNA-processing factor 19 Saccharomyces cerevisiae 0.056629777 4 LEVO MLCAISGKVPRRPVLSPKSRTIFEKSLLEQYVKDTGNDPITNEPLSIEEIVEIVPSAQQASLTESTNSATLKANYSIPNL LTSLQNEWDAIMLENFKLRSTLDSLTKKLSTVMYERDAAKLVAAQLLMEKNEDSKDLPKSSQQAVAITREEFLQGLLQSS RDFVARGKLKAPKWPILKNLELLQAQNYSRNIKTFPYKELNKSMYYDKWVCMCRCEDGALHFTQLKDSKTITTITTPNPR TGGEHPAIISRGPCNRLLLLYPGNQITILDSKTNKVLREIEVDSANEIIYMYGHNEVNTEYFIWADNRGTIGFQSYEDDS QYIVHSAKSDVEYSSGVLHKDSLLLALYSPDGILDVYNLSSPDQASSRFPVDEEAKIKEVKFADNGYWMVVECDQTVVCF DLRKDVGTLAYPTYTIPEFKTGTVTYDIDDSGKNMIAYSNESNSLTIYKFDKKTKNWTKDEESALCLQSDTADFTDMDVV CGDGGIAAILKTNDSFNIVALTP P32523 6.3.2.- MAGNESIUM ION 2.4305e-05 3 MG POTASSIUM ION 3.9098e-05 2 K INOSITOL HEXAKISPHOSPHATE 0.0006600349999999999 1 IHP GUANOSINE-5'-TRIPHOSPHATE 0.0005231799999999999 1 GTP ZINC ION 6.5409e-05 6 ZN singleParticle particle 0.3 7.9 20.0 Hepes.KOH pH 7.9 100.0 KCl potassium chloride 250.0 EDTA 1.0 glycerol 0.0025 Nonidet P-40 (NP-40)

NP-40 is also called IGEPAL CA-630

Quantifoil R1.2/1.3 COPPER 400 CARBON HOLEY ARRAY 6.0 GLOW DISCHARGE 30 AIR 20.0 ETHANE 100 277 FEI VITROBOT MARK III

3.5 microlitres sample were applied to the grid, left for 25 seconds and then blotted for 3.0-3.5 seconds before plunging..

FEI TITAN KRIOS FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 300 0.5 4.5 81000.0 FEI TITAN KRIOS AUTOGRID HOLDER NITROGEN GIF Quantum

GIF Quantum energy filter, 20 eV slit width

GATAN K2 SUMMIT (4k x 4k) SUPER-RESOLUTION 3596 0.8 2.0

Total dose: 40 electrons/Angstrom^2 over 16 seconds. 20 movie frames collected at 1.25 frames per second.

1 350000

Selected initial particles automatically using C complex 2D class averages, low-pass filtered to 20 Angstrom for automatic particle picking.

CTFFIND 4 PHASE FLIPPING AND AMPLITUDE CORRECTION EMD-3539 4 C1 4.17 FSC 0.143 CUT-OFF RELION 1.4

A 3D reconstruction was obtained after refinement of a subset of particles obtained by classification with a mask around Prp22.

29527 PROJECTION MATCHING RELION 1.4 PROJECTION MATCHING RELION 1.4 4 RELION 1.4 FLEXIBLE FIT

Used secondary structure restraints generated in ProSMART and LibG.

Fourier Shell Correlation RECIPROCAL 330.0 emd_3541_additional_1.map.gz 1 IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) 412 412 412 0 0 0 412 412 412 589.16 589.16 589.16 90.0 90.0 90.0 X Y Z -0.01757239 0.07314288 0.00026389147 0.002914196 1.43 1.43 1.43 AUTHOR ::::EMDATABANK.org::::EMD-3541:::: Map of the spliceosomal C-star complex resulting from focussed classification on peripheral regions of U2 snRNP