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- EMDB-55617: Cryo-EM structure of the human LENG8-PCID2-DSS1 complex bound to ... -

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Entry
Database: EMDB / ID: EMD-55617
TitleCryo-EM structure of the human LENG8-PCID2-DSS1 complex bound to UAP56 and RRP1B
Map data
Sample
  • Complex: Cryo-EM structure of the human LENG8-PCID2-DSS1 complex bound to UAP56 and RRP1B
    • Protein or peptide: Spliceosome RNA helicase DDX39B
    • Protein or peptide: PCI domain-containing protein 2
    • Protein or peptide: 26S proteasome complex subunit SEM1
  • Protein or peptide: Leukocyte receptor cluster member 8,Ribosomal RNA processing protein 1 homolog B
KeywordsRNA metabolism / RNA decay / splicing quality control / NUCLEAR PROTEIN
Function / homology
Function and homology information


negative regulation of lymphoid progenitor cell differentiation / granular component / transcription export complex / U6 snRNP / transcription export complex 2 / post-transcriptional tethering of RNA polymerase II gene DNA at nuclear periphery / negative regulation of GTPase activity / nuclear pore nuclear basket / spleen development / Impaired BRCA2 translocation to the nucleus ...negative regulation of lymphoid progenitor cell differentiation / granular component / transcription export complex / U6 snRNP / transcription export complex 2 / post-transcriptional tethering of RNA polymerase II gene DNA at nuclear periphery / negative regulation of GTPase activity / nuclear pore nuclear basket / spleen development / Impaired BRCA2 translocation to the nucleus / Impaired BRCA2 binding to SEM1 (DSS1) / ATP-dependent activity, acting on RNA / mRNA 3'-end processing / ATP-dependent protein binding / integrator complex / U4 snRNP / host-mediated activation of viral transcription / RNA export from nucleus / U4 snRNA binding / Transport of Mature mRNA derived from an Intron-Containing Transcript / proteasome regulatory particle, lid subcomplex / RNA Polymerase II Transcription Termination / positive regulation of B cell differentiation / poly(A)+ mRNA export from nucleus / Regulation of ornithine decarboxylase (ODC) / Proteasome assembly / preribosome, small subunit precursor / cellular response to type I interferon / Cross-presentation of soluble exogenous antigens (endosomes) / Somitogenesis / negative regulation of gene expression, epigenetic / Homologous DNA Pairing and Strand Exchange / Defective homologous recombination repair (HRR) due to BRCA1 loss of function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA1 binding function / Defective HDR through Homologous Recombination Repair (HRR) due to PALB2 loss of BRCA2/RAD51/RAD51C binding function / Resolution of D-loop Structures through Synthesis-Dependent Strand Annealing (SDSA) / regulation of RNA splicing / Resolution of D-loop Structures through Holliday Junction Intermediates / spliceosomal complex assembly / Impaired BRCA2 binding to RAD51 / Presynaptic phase of homologous DNA pairing and strand exchange / U6 snRNA binding / RHOBTB2 GTPase cycle / proteasome assembly / mRNA export from nucleus / proteasome complex / spliceosomal complex / heterochromatin / mRNA Splicing - Major Pathway / RNA splicing / regulation of proteasomal protein catabolic process / Regulation of activated PAK-2p34 by proteasome mediated degradation / cellular response to virus / ubiquitin binding / Autodegradation of Cdh1 by Cdh1:APC/C / proteasomal protein catabolic process / APC/C:Cdc20 mediated degradation of Securin / Asymmetric localization of PCP proteins / Ubiquitin-dependent degradation of Cyclin D / SCF-beta-TrCP mediated degradation of Emi1 / NIK-->noncanonical NF-kB signaling / AUF1 (hnRNP D0) binds and destabilizes mRNA / TNFR2 non-canonical NF-kB pathway / Assembly of the pre-replicative complex / mRNA splicing, via spliceosome / Vpu mediated degradation of CD4 / Cdc20:Phospho-APC/C mediated degradation of Cyclin A / euchromatin / Dectin-1 mediated noncanonical NF-kB signaling / Degradation of DVL / Degradation of AXIN / Degradation of CRY and PER proteins / Hh mutants are degraded by ERAD / transcription elongation by RNA polymerase II / Activation of NF-kappaB in B cells / G2/M Checkpoints / Degradation of GLI1 by the proteasome / Hedgehog ligand biogenesis / Autodegradation of the E3 ubiquitin ligase COP1 / Regulation of RUNX3 expression and activity / Defective CFTR causes cystic fibrosis / GSK3B and BTRC:CUL1-mediated-degradation of NFE2L2 / Negative regulation of NOTCH4 signaling / AMPK-induced ERAD and lysosome mediated degradation of PD-L1(CD274) / Hedgehog 'on' state / APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1 / Vif-mediated degradation of APOBEC3G / FBXL7 down-regulates AURKA during mitotic entry and in early mitosis / Degradation of GLI2 by the proteasome / GLI3 is processed to GLI3R by the proteasome / MAPK6/MAPK4 signaling / GSK3B-mediated proteasomal degradation of PD-L1(CD274) / Degradation of CDH1 / Degradation of beta-catenin by the destruction complex / Oxygen-dependent proline hydroxylation of Hypoxia-inducible Factor Alpha / CDK-mediated phosphorylation and removal of Cdc6 / HDR through Homologous Recombination (HRR) / ABC-family protein mediated transport / CLEC7A (Dectin-1) signaling / SCF(Skp2)-mediated degradation of p27/p21
Similarity search - Function
Csn12 family / SAC3/GANP/THP3, conserved domain / SAC3/GANP/THP3 / SAC3/GANP family / Ribosomal RNA processing protein 1-like / Nucleolar protein,Nop52 / DSS1/SEM1 / DSS1/SEM1 family / DSS1_SEM1 / RNA helicase, DEAD-box type, Q motif ...Csn12 family / SAC3/GANP/THP3, conserved domain / SAC3/GANP/THP3 / SAC3/GANP family / Ribosomal RNA processing protein 1-like / Nucleolar protein,Nop52 / DSS1/SEM1 / DSS1/SEM1 family / DSS1_SEM1 / RNA helicase, DEAD-box type, Q motif / PCI/PINT associated module / DEAD-box RNA helicase Q motif profile. / PCI domain / Proteasome component (PCI) domain / PCI domain profile. / DEAD/DEAH box helicase domain / DEAD/DEAH box helicase / Helicase conserved C-terminal domain / helicase superfamily c-terminal domain / Superfamilies 1 and 2 helicase C-terminal domain profile. / Superfamilies 1 and 2 helicase ATP-binding type-1 domain profile. / DEAD-like helicases superfamily / Helicase, C-terminal / Helicase superfamily 1/2, ATP-binding domain / Winged helix-like DNA-binding domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
26S proteasome complex subunit SEM1 / Spliceosome RNA helicase DDX39B / Ribosomal RNA processing protein 1 homolog B / PCI domain-containing protein 2 / Leukocyte receptor cluster member 8
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsAbbas DK / Bonneau F / Basquin J / Conti E / Schussler S / Wilkinson ME
Funding supportEuropean Union, Germany, Denmark, 3 items
OrganizationGrant numberCountry
European Research Council (ERC)European Union
German Research Foundation (DFG) Germany
Novo Nordisk Foundation Denmark
CitationJournal: Genes Dev / Year: 2026
Title: Evolutionarily conserved spliceosome-exosome pathway in nuclear mRNA surveillance.
Authors: Daniel K Abbas / Fabien Bonneau / Max E Wilkinson / Steffen Schüssler / Jérôme Basquin / Elena Conti /
Abstract: Intron-containing mRNAs are cotranscriptionally spliced and assembled into messenger ribonucleoprotein (mRNP) particles, a process monitored by surveillance pathways. Here, we combined biochemical ...Intron-containing mRNAs are cotranscriptionally spliced and assembled into messenger ribonucleoprotein (mRNP) particles, a process monitored by surveillance pathways. Here, we combined biochemical and structural approaches to elucidate the mechanisms by which mRNPs are sorted between two opposing fates: nuclear degradation and cytoplasmic export. While the human GANP-PCID2 complex is known to connect mRNPs to nuclear export, our data indicate that the LENG8-PCID2 complex operates as an mRNP decay connector, coupling nuclear mRNPs to the RNA-degrading exosome via the PAXT adaptor complex. Both recognize the mRNP component UAP56, but LENG8-PCID2 uniquely associates with early splicing factors through a direct interaction with U1A and RRP1B. Similarly, the Thp3-Csn12 ortholog in budding yeast couples the early splicing factors Mud2-Bbp with the nuclear exosome. The spliceosome-exosome mRNP decay pathway we uncovered reveals molecular principles that remain strikingly conserved across evolution, despite the fundamental differences in splicing and decay between humans and budding yeast.
History
DepositionNov 7, 2025-
Header (metadata) releaseMay 27, 2026-
Map releaseMay 27, 2026-
UpdateJul 15, 2026-
Current statusJul 15, 2026Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_55617.png

Downloads & links

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Map

FileDownload / File: emd_55617.map.gz / Format: CCP4 / Size: 91.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
0.85 Å/pix.
x 288 pix.
= 245.146 Å		0.85 Å/pix.
x 288 pix.
= 245.146 Å		0.85 Å/pix.
x 288 pix.
= 245.146 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.8512 Å
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Histogram (log scale)
Contour LevelBy AUTHOR: 0.075
Minimum - Maximum-0.10117357 - 0.2514501
Average (Standard dev.)0.00004388145 (±0.005627999)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions288288288
Spacing288288288
CellA=B=C: 245.1456 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_55617_msk_1.map
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Half map: #2

Fileemd_55617_half_map_1.map
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Half map: #1

Fileemd_55617_half_map_2.map
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Sample components

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Entire : Cryo-EM structure of the human LENG8-PCID2-DSS1 complex bound to ...

EntireName: Cryo-EM structure of the human LENG8-PCID2-DSS1 complex bound to UAP56 and RRP1B
Components
  • Complex: Cryo-EM structure of the human LENG8-PCID2-DSS1 complex bound to UAP56 and RRP1B
    • Protein or peptide: Spliceosome RNA helicase DDX39B
    • Protein or peptide: PCI domain-containing protein 2
    • Protein or peptide: 26S proteasome complex subunit SEM1
  • Protein or peptide: Leukocyte receptor cluster member 8,Ribosomal RNA processing protein 1 homolog B

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Supramolecule #1: Cryo-EM structure of the human LENG8-PCID2-DSS1 complex bound to ...

SupramoleculeName: Cryo-EM structure of the human LENG8-PCID2-DSS1 complex bound to UAP56 and RRP1B
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1, #3-#4
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Spliceosome RNA helicase DDX39B

MacromoleculeName: Spliceosome RNA helicase DDX39B / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO / EC number: RNA helicase
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 49.412582 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: GPDSMAENDV DNELLDYEDD EVETAAGGDG AEAPAKKDVK GSYVSIHSSG FRDFLLKPEL LRAIVDCGFE HPSEVQHECI PQAILGMDV LCQAKSGMGK TAVFVLATLQ QLEPVTGQVS VLVMCHTREL AFQISKEYER FSKYMPNVKV AVFFGGLSIK K DEEVLKKN ...String:
GPDSMAENDV DNELLDYEDD EVETAAGGDG AEAPAKKDVK GSYVSIHSSG FRDFLLKPEL LRAIVDCGFE HPSEVQHECI PQAILGMDV LCQAKSGMGK TAVFVLATLQ QLEPVTGQVS VLVMCHTREL AFQISKEYER FSKYMPNVKV AVFFGGLSIK K DEEVLKKN CPHIVVGTPG RILALARNKS LNLKHIKHFI LDECDKMLEQ LDMRRDVQEI FRMTPHEKQV MMFSATLSKE IR PVCRKFM QDPMEIFVDD ETKLTLHGLQ QYYVKLKDNE KNRKLFDLLD VLEFNQVVIF VKSVQRCIAL AQLLVEQNFP AIA IHRGMP QEERLSRYQQ FKDFQRRILV ATNLFGRGMD IERVNIAFNY DMPEDSDTYL HRVARAGRFG TKGLAITFVS DEND AKILN DVQDRFEVNI SELPDEIDIS SYIEQTR

UniProtKB: Spliceosome RNA helicase DDX39B

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Macromolecule #2: Leukocyte receptor cluster member 8,Ribosomal RNA processing prot...

MacromoleculeName: Leukocyte receptor cluster member 8,Ribosomal RNA processing protein 1 homolog B
type: protein_or_peptide / ID: 2
Details: Chains C and F are part of the same fusion protein (LENG8(550-800)-GS-RRP1B(742-758). Chain C is LENG8(550-800)., Chains C and F are part of the same fusion protein (LENG8(550-800)-GS- ...Details: Chains C and F are part of the same fusion protein (LENG8(550-800)-GS-RRP1B(742-758). Chain C is LENG8(550-800)., Chains C and F are part of the same fusion protein (LENG8(550-800)-GS-RRP1B(742-758). Chain F is RRP1B(742-758).,Chains C and F are part of the same fusion protein (LENG8(550-800)-GS-RRP1B(742-758). Chain C is LENG8(550-800)., Chains C and F are part of the same fusion protein (LENG8(550-800)-GS-RRP1B(742-758). Chain F is RRP1B(742-758).
Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 30.940674 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: GPDIVGTCPD ITKHYLRLTC APDPSTVRPV AVLKKSLCMV KCHWKEKQDY AFACEQMKSI RQDLTVQGIR TEFTVEVYET HARIALEKG DHEEFNQCQT QLKSLYAENL PGNVGEFTAY RILYYIFTKN SGDITTELAY LTRELKADPC VAHALALRTA W ALGNYHRF ...String:
GPDIVGTCPD ITKHYLRLTC APDPSTVRPV AVLKKSLCMV KCHWKEKQDY AFACEQMKSI RQDLTVQGIR TEFTVEVYET HARIALEKG DHEEFNQCQT QLKSLYAENL PGNVGEFTAY RILYYIFTKN SGDITTELAY LTRELKADPC VAHALALRTA W ALGNYHRF FRLYCHAPCM SGYLVDKFAD RERKVALKAM IKTFRPALPV SYLQAELAFE GEAACRAFLE PLGLAYTGPD NS SIDCRLS LAQLSAFGSK PLTTTPRRRP RAMDFF

UniProtKB: Leukocyte receptor cluster member 8, Ribosomal RNA processing protein 1 homolog B

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Macromolecule #3: PCI domain-containing protein 2

MacromoleculeName: PCI domain-containing protein 2 / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 46.371211 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MGSMAHITIN QYLQQVYEAI DSRDGASCAE LVSFKHPHVA NPRLQMASPE EKCQQVLEPP YDEMFAAHLR CTYAVGNHDF IEAYKCQTV IVQSFLRAFQ AHKEENWALP VMYAVALDLR VFANNADQQL VKKGKSKVGD MLEKAAELLM SCFRVCASDT R AGIEDSKK ...String:
MGSMAHITIN QYLQQVYEAI DSRDGASCAE LVSFKHPHVA NPRLQMASPE EKCQQVLEPP YDEMFAAHLR CTYAVGNHDF IEAYKCQTV IVQSFLRAFQ AHKEENWALP VMYAVALDLR VFANNADQQL VKKGKSKVGD MLEKAAELLM SCFRVCASDT R AGIEDSKK WGMLFLVNQL FKIYFKINKL HLCKPLIRAI DSSNLKDDYS TAQRVTYKYY VGRKAMFDSD FKQAEEYLSF AF EHCHRSS QKNKRMILIY LLPVKMLLGH MPTVELLKKY HLMQFAEVTR AVSEGNLLLL HEALAKHEAF FIRCGIFLIL EKL KIITYR NLFKKVYLLL KTHQLSLDAF LVALKFMQVE DVDIDEVQCI LANLIYMGHV KGYISHQHQK LVVSKQNPFP PLST VC

UniProtKB: PCI domain-containing protein 2

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Macromolecule #4: 26S proteasome complex subunit SEM1

MacromoleculeName: 26S proteasome complex subunit SEM1 / type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 8.284611 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MSEKKQPVDL GLLEEDDEFE EFPAEDWAGL DEDEDAHVWE DNWDDDNVED DFSNQLRAEL EKHGYKMETS

UniProtKB: 26S proteasome complex subunit SEM1

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 7.5
VitrificationCryogen name: ETHANE-PROPANE / Chamber humidity: 95 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 10 eV
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number real images: 28229 / Average electron dose: 61.8 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 0.5 µm / Nominal magnification: 105000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionSoftware - Name: cryoSPARC (ver. 4.7.0) / Software - details: Patch CTF Estimation / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 4.7.0) / Number images used: 892731
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final 3D classificationNumber classes: 3
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelChain - Source name: AlphaFold / Chain - Initial model type: in silico model
SoftwareName: Coot (ver. 0.9.8.95)
Output model

PDB-9t6l:
Cryo-EM structure of the human LENG8-PCID2-DSS1 complex bound to UAP56 and RRP1B

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