post-mRNA release spliceosomal complex / generation of catalytic spliceosome for first transesterification step / U12-type spliceosomal complex / pICln-Sm protein complex / U2-type catalytic step 1 spliceosome / pre-mRNA binding / snRNP binding / SMN-Sm protein complex / P granule / spliceosomal tri-snRNP complex ...post-mRNA release spliceosomal complex / generation of catalytic spliceosome for first transesterification step / U12-type spliceosomal complex / pICln-Sm protein complex / U2-type catalytic step 1 spliceosome / pre-mRNA binding / snRNP binding / SMN-Sm protein complex / P granule / spliceosomal tri-snRNP complex / commitment complex / mRNA cis splicing, via spliceosome / U2-type catalytic step 2 spliceosome / U4 snRNP / U2 snRNP / U1 snRNP / U2-type prespliceosome / precatalytic spliceosome / cyclosporin A binding / spliceosomal complex assembly / spliceosomal tri-snRNP complex assembly / Prp19 complex / protein K63-linked ubiquitination / U5 snRNA binding / U5 snRNP / U2 snRNA binding / U6 snRNA binding / pre-mRNA intronic binding / spliceosomal snRNP assembly / U1 snRNA binding / U4/U6 x U5 tri-snRNP complex / catalytic step 2 spliceosome / RNA splicing / peptidyl-prolyl cis-trans isomerase activity / RNA polymerase II CTD heptapeptide repeat P3 isomerase activity / RNA polymerase II CTD heptapeptide repeat P6 isomerase activity / peptidylprolyl isomerase / helicase activity / spliceosomal complex / RING-type E3 ubiquitin transferase / mRNA splicing, via spliceosome / mRNA processing / metallopeptidase activity / ubiquitin-protein transferase activity / ubiquitin protein ligase activity / protein folding / DNA repair / GTPase activity / mRNA binding / GTP binding / DNA binding / RNA binding / metal ion binding / nucleus / cytosol / cytoplasm Similarity search - Function
HAT (Half-A-TPR) repeat / : / : / Intron-binding protein aquarius, beta-barrel / Intron-binding protein aquarius insert domain / Pre-mRNA-splicing factor SPF27 / Torus domain / Breast carcinoma amplified sequence 2 (BCAS2) / Torus domain / Intron-binding protein aquarius, N-terminal ...HAT (Half-A-TPR) repeat / : / : / Intron-binding protein aquarius, beta-barrel / Intron-binding protein aquarius insert domain / Pre-mRNA-splicing factor SPF27 / Torus domain / Breast carcinoma amplified sequence 2 (BCAS2) / Torus domain / Intron-binding protein aquarius, N-terminal / Intron-binding protein aquarius N-terminal / mRNA splicing factor SYF2 / SYF2 splicing factor / : / : / Pre-mRNA-processing factor 17 / Pre-mRNA-splicing factor 19 / Pre-mRNA-processing factor 19 / Prp19/Pso4-like / Myb-like domain profile. / Cyclophilin-type peptidyl-prolyl cis-trans isomerase, cyclophilin A-like / : / DNA2/NAM7 helicase, helicase domain / : / AAA domain / STL11, N-terminal / SKI-interacting protein SKIP, SNW domain / SKI-interacting protein, SKIP / SKIP/SNW domain / Pre-mRNA-splicing factor Cwf15/Cwc15 / Cwf15/Cwc15 cell cycle control protein / WD repeat Prp46/PLRG1-like / Pre-mRNA-splicing factor Cwc2/Slt11 / : / G10 protein / Pre-mRNA-splicing factor BUD31 / Pre-mRNA splicing factor component Cdc5p/Cef1, C-terminal / : / : / pre-mRNA splicing factor component / DNA2/NAM7-like helicase / : / Initiation factor eIF-4 gamma, MA3 / MA3 domain / MI domain profile. / Domain in DAP-5, eIF4G, MA-3 and other proteins. / MIF4G domain / Myb-like DNA-binding domain / Middle domain of eukaryotic initiation factor 4G (eIF4G) / MIF4G-like, type 3 / Small nuclear ribonucleoprotein D1 / U-box domain profile. / Modified RING finger domain / U-box domain / Zinc finger, CCCH-type superfamily / zinc finger / 116kDa U5 small nuclear ribonucleoprotein component, N-terminal / 116kDa U5 small nuclear ribonucleoprotein component, C-terminal / Snu114, GTP-binding domain / 116 kDa U5 small nuclear ribonucleoprotein component N-terminus / Pre-mRNA-splicing factor Syf1-like / Small nuclear ribonucleoprotein Sm D3 / Small nuclear ribonucleoprotein Sm D2 / Small nuclear ribonucleoprotein E / Small nuclear ribonucleoprotein G / Small nuclear ribonucleoprotein F / Sm-like protein Lsm7/SmG / Like-Sm (LSM) domain containing protein, LSm4/SmD1/SmD3 / Sm-like protein Lsm6/SmF / Myb-type HTH DNA-binding domain profile. / Zinc finger, CCCH-type / Zinc finger C3H1-type profile. / LSM domain / LSM domain, eukaryotic/archaea-type / snRNP Sm proteins / HAT (Half-A-TPR) repeat / HAT (Half-A-TPR) repeats / Myb domain / Cyclophilin-type peptidyl-prolyl cis-trans isomerase / : / Sm domain profile. / LSM domain superfamily / Translation elongation factor EFG/EF2, domain IV / Elongation factor G, domain IV / Elongation factor G, domain IV / Elongation factor G C-terminus / JAB1/Mov34/MPN/PAD-1 ubiquitin protease / Elongation factor EFG, domain V-like / Elongation factor G C-terminus / Cyclophilin-type peptidyl-prolyl cis-trans isomerase, conserved site / Cyclophilin-type peptidyl-prolyl cis-trans isomerase signature. / Cyclophilin-type peptidyl-prolyl cis-trans isomerase domain profile. / Cyclophilin-type peptidyl-prolyl cis-trans isomerase domain / Cyclophilin type peptidyl-prolyl cis-trans isomerase/CLD / EF-G domain III/V-like / Cyclophilin-like domain superfamily / PROCT domain / Prp8 RNase domain IV, fingers region / PROCT (NUC072) domain / PRO8NT domain Similarity search - Domain/homology
Cwf15/Cwc15 cell cycle control protein / Pre-mRNA-splicing factor SPF27 / Small nuclear ribonucleoprotein Sm D1 / Sm protein B / Crooked neck protein / Uncharacterized protein / G10 protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein ...Cwf15/Cwc15 cell cycle control protein / Pre-mRNA-splicing factor SPF27 / Small nuclear ribonucleoprotein Sm D1 / Sm protein B / Crooked neck protein / Uncharacterized protein / G10 protein / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / MI domain-containing protein / Intron-binding protein aquarius / Uncharacterized protein / Uncharacterized protein / Uncharacterized protein / MPN domain-containing protein / peptidylprolyl isomerase / SKI-interacting protein SKIP SNW domain-containing protein / Small nuclear ribonucleoprotein G / Small nuclear ribonucleoprotein Sm D2 / Small nuclear ribonucleoprotein Sm D3 / Pre-mRNA-processing factor 19 / Small nuclear ribonucleoprotein E / Sm protein F / Elongation factor Tu, chloroplastic / Peptidyl-prolyl cis-trans isomerase Similarity search - Component
Biological species
Chlamydomonas reinhardtii (plant)
Method
single particle reconstruction / cryo EM / Resolution: 2.6 Å
National Natural Science Foundation of China (NSFC)
China
Citation
Journal: EMBO J / Year: 2025 Title: Structure of a step II catalytically activated spliceosome from Chlamydomonas reinhardtii. Authors: Yichen Lu / Ke Liang / Xiechao Zhan / Abstract: Pre-mRNA splicing, a fundamental step in eukaryotic gene expression, is executed by the spliceosomes. While there is extensive knowledge of the composition and structure of spliceosomes in yeasts and ...Pre-mRNA splicing, a fundamental step in eukaryotic gene expression, is executed by the spliceosomes. While there is extensive knowledge of the composition and structure of spliceosomes in yeasts and humans, the structural diversity of spliceosomes in non-canonical organisms remains unclear. Here, we present a cryo-EM structure of a step II catalytically activated spliceosome (C complex) derived from the unicellular green alga Chlamydomonas reinhardtii at 2.6 Å resolution. This Chlamydomonas C complex comprises 29 proteins and four RNA elements, creating a dynamic assembly that shares a similar overall architecture with yeast and human counterparts but also has unique features of its own. Distinctive structural characteristics include variations in protein compositions as well as some noteworthy RNA features. The splicing factor Prp17, with four fragments and a WD40 domain, is engaged in intricate interactions with multiple protein and RNA components. The structural elucidation of Chlamydomonas C complex provides insights into the molecular mechanism of RNA splicing in plants and understanding splicing evolution in eukaryotes.
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