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- EMDB-29279: Cryo-EM structure of a group II intron immediately before branching -
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Open data
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Basic information
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Title | Cryo-EM structure of a group II intron immediately before branching | |||||||||
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![]() | group II intron / splicing / branching / maturase / SPLICING-RNA complex | |||||||||
Function / homology | ![]() RNA-directed DNA polymerase activity / endonuclease activity / nucleic acid binding / zinc ion binding Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.8 Å | |||||||||
![]() | Haack DB / Rudolfs BG / Zhang C / Lyumkis D / Toor N | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis of branching during RNA splicing. Authors: Daniel B Haack / Boris Rudolfs / Cheng Zhang / Dmitry Lyumkis / Navtej Toor / ![]() Abstract: Branching is a critical step in RNA splicing that is essential for 5' splice site selection. Recent spliceosome structures have led to competing models for the recognition of the invariant adenosine ...Branching is a critical step in RNA splicing that is essential for 5' splice site selection. Recent spliceosome structures have led to competing models for the recognition of the invariant adenosine at the branch point. However, there are no structures of any splicing complex with the adenosine nucleophile docked in the active site and positioned to attack the 5' splice site. Thus we lack a mechanistic understanding of adenosine selection and splice site recognition during RNA splicing. Here we present a cryo-electron microscopy structure of a group II intron that reveals that active site dynamics are coupled to the formation of a base triple within the branch-site helix that positions the 2'-OH of the adenosine for nucleophilic attack on the 5' scissile phosphate. This structure, complemented with biochemistry and comparative analyses to splicing complexes, supports a base triple model of adenosine recognition for branching within group II introns and the evolutionarily related spliceosome. | |||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 136.7 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 15.5 KB 15.5 KB | Display Display | ![]() |
Images | ![]() | 58.5 KB | ||
Filedesc metadata | ![]() | 6.1 KB | ||
Others | ![]() ![]() | 134.3 MB 134.3 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8fliMC M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Voxel size | X=Y=Z: 1.15 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: #2
File | emd_29279_half_map_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
-Half map: #1
File | emd_29279_half_map_2.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
-Entire : Group IIB intron in complex with its maturase protein
Entire | Name: Group IIB intron in complex with its maturase protein |
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Components |
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-Supramolecule #1: Group IIB intron in complex with its maturase protein
Supramolecule | Name: Group IIB intron in complex with its maturase protein / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2 |
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Source (natural) | Organism: ![]() ![]() |
-Macromolecule #1: Group II Intron
Macromolecule | Name: Group II Intron / type: rna / ID: 1 / Number of copies: 1 |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 289.257938 KDa |
Sequence | String: CCCAGGGUUG GCCGAGCGUU GCGACGCGAA AGCUAGCCAG AUGAUUGUCC CACUAGCCCA ACAAGCUAGA ACGGGACCGG UUGUUCCCC CAACCGUAGC CUAGGGAGGC AUGCGUGACU GGUAACGGUC AGGUGUGAAG CCCUCCCGAC AAUGUAGCCC G AACCGCAA ...String: CCCAGGGUUG GCCGAGCGUU GCGACGCGAA AGCUAGCCAG AUGAUUGUCC CACUAGCCCA ACAAGCUAGA ACGGGACCGG UUGUUCCCC CAACCGUAGC CUAGGGAGGC AUGCGUGACU GGUAACGGUC AGGUGUGAAG CCCUCCCGAC AAUGUAGCCC G AACCGCAA GGUUGAAGCU GAAUCCGUGA GGAGGAAGCA ACUUCACCAG UGUCAGGUGA UAGGGAACUA GGCUUGAGGG UA UGGUGAG CACAUGCGAA GUGAUGUCAG AAGCCUCGUC ACAGACCAAC AGGCCAAAGA CACUGAUAGG CCUGAGCCAA AAC GGCAAA UGGAUAGGCU ACAUCGCUCG CUCGUCGGUG UACGGGGACG UCAAUCCAUC GGGGCACAGU CACCACCUAA CCCC UCGUG UCAUCUGGUU GGAACGCGGU AAGCCCGUAU CCUCGCCUUG AACACUCAAG GCAGGCAAAC CUUCGGGAAU GCUGA UGGG GGUGCGGGUA UGGGAUGCAG GAGAAAGCGA AUGCCGGUCU GUAAUGGACC GGAUAGGGGU UGAGGAGACA AUCCAA CAU CACCCCGCCC GAAAGGGAGC AGACUUCCUG CUGGUCUCUC UUUGCGAGAU AGCCUGUAGA ACCUCUUGAA UGGAGAC AA GGCAAAUGGC AGUGGAACAA ACCACUGGUG CGGUCACCAA CCAAACGGAA ACAAGCUGGC ACAGCAUAGA CUGGGCCA A AGCCAACCGU GAGGUAAAGA GGCUGCAAGU GCGUAUCGCA AAGGCGUUCG CGCCGGUUCC UCUUGAAAGA GGGGCUUUG AGAGGCCUGA GCCGGAUGUG GGGAAACUCA CAAGUCCGGU UCUUAGGGGG CGGGGAUGGC AUUCGUGCCU CCCUGCUACC CGGCGAUGA GGCA |
-Macromolecule #2: Maturase reverse transcriptase
Macromolecule | Name: Maturase reverse transcriptase / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 65.065121 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: METRQMAVEQ TTGAVTNQTE TSWHSIDWAK ANREVKRLQV RIAKAVKEGR WGKVKALQWL LTHSFYGKAL AVKRVTDNSG SKTPGVDGI TWSTQEQKAQ AIKSLRRRGY KPQPLRRVYI PKASGKQRPL GIPTTKDRAM QALYALALEP VAETTADRNS Y GFRQGRCT ...String: METRQMAVEQ TTGAVTNQTE TSWHSIDWAK ANREVKRLQV RIAKAVKEGR WGKVKALQWL LTHSFYGKAL AVKRVTDNSG SKTPGVDGI TWSTQEQKAQ AIKSLRRRGY KPQPLRRVYI PKASGKQRPL GIPTTKDRAM QALYALALEP VAETTADRNS Y GFRQGRCT ADAAGQCFTV LGRSDCAKYI LDADITGCFD NISHEWLLDN IPLDKEVLRK WLKSGFVWKQ QLFPTHAGTP QG GVISPML ANMTLDGMEE LLKKHLRKQK VNLIRYADDF VVTGESKETL EKVTTVIQEF LKERGLTLSE EKTKVVHIEE GFD FLGWNI RKYGEKLLIK PAKKNIKAFH KKIRDALKEL RTATQEAVID TLNPIIKGWA NYHRNQVSKR IFNRADDNIW HKLW RWAKR RHPNKPARWT KNKYFIKIGN RHWVFGTWKK DKEGRLRSRY LIKAGDTRIQ RHVKIKADAN PFLPEWAEYF EERKK LKEA PAQYRRIRRE LWKKQGGICP VCGGEIEQDM LTEIHHILPK HKGGSDDLDN LVLIHANCHK QVHSRDGQHS RFLLKE GL UniProtKB: Maturase reverse transcriptase |
-Macromolecule #3: MAGNESIUM ION
Macromolecule | Name: MAGNESIUM ION / type: ligand / ID: 3 / Number of copies: 3 / Formula: MG |
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Molecular weight | Theoretical: 24.305 Da |
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.5 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TALOS ARCTICA |
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Image recording | Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 31.6 e/Å2 |
Electron beam | Acceleration voltage: 200 kV / Electron source: ![]() |
Electron optics | Illumination mode: OTHER / Imaging mode: OTHER / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm |
Experimental equipment | ![]() Model: Talos Arctica / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: PDB ENTRY PDB model - PDB ID: |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 38881 |
Initial angle assignment | Type: MAXIMUM LIKELIHOOD |
Final angle assignment | Type: MAXIMUM LIKELIHOOD |