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- EMDB-44555: Septin Tetrameric Complex SEPT7/SEPT9 of Ciona intestinalis by Cryo-EM -
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Open data
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Basic information
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Title | Septin Tetrameric Complex SEPT7/SEPT9 of Ciona intestinalis by Cryo-EM | ||||||||||||
![]() | Raw map | ||||||||||||
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![]() | Complex / SPA / Cytoskeleton / CELL CYCLE | ||||||||||||
Function / homology | ![]() septin complex / septin ring / cytoskeleton-dependent cytokinesis / cell division site / cleavage furrow / cilium assembly / cilium / kinetochore / microtubule cytoskeleton / protein localization ...septin complex / septin ring / cytoskeleton-dependent cytokinesis / cell division site / cleavage furrow / cilium assembly / cilium / kinetochore / microtubule cytoskeleton / protein localization / molecular adaptor activity / GTPase activity / GTP binding Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() | ||||||||||||
Method | single particle reconstruction / cryo EM / Resolution: 2.72 Å | ||||||||||||
![]() | Mendonca DC / Pereira HM / Garratt RC | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural Insights into Ciona intestinalis Septins: Complexes Suggest a Mechanism for Nucleotide-dependent Interfacial Cross-talk. Authors: Deborah C Mendonça / Sinara T B Morais / Heloísa Ciol / Andressa P A Pinto / Diego A Leonardo / Humberto D'Muniz Pereira / Napoleão F Valadares / Rodrigo V Portugal / Bruno P Klaholz / ...Authors: Deborah C Mendonça / Sinara T B Morais / Heloísa Ciol / Andressa P A Pinto / Diego A Leonardo / Humberto D'Muniz Pereira / Napoleão F Valadares / Rodrigo V Portugal / Bruno P Klaholz / Richard C Garratt / Ana P U Araujo / ![]() ![]() Abstract: Septins are filamentous nucleotide-binding proteins which can associate with membranes in a curvature-dependent manner leading to structural remodelling and barrier formation. Ciona intestinalis, a ...Septins are filamentous nucleotide-binding proteins which can associate with membranes in a curvature-dependent manner leading to structural remodelling and barrier formation. Ciona intestinalis, a model for exploring the development and evolution of the chordate lineage, has only four septin-coding genes within its genome. These represent orthologues of the four classical mammalian subgroups, making it a minimalist non-redundant model for studying the modular assembly of septins into linear oligomers and thereby filamentous polymers. Here, we show that C. intestinalis septins present a similar biochemistry to their human orthologues and also provide the cryo-EM structures of an octamer, a hexamer and a tetrameric sub-complex. The octamer, which has the canonical arrangement (2-6-7-9-9-7-6-2) clearly shows an exposed NC-interface at its termini enabling copolymerization with hexamers into mixed filaments. Indeed, only combinations of septins which had CiSEPT2 occupying the terminal position were able to assemble into filaments via NC-interface association. The CiSEPT7-CiSEPT9 tetramer is the smallest septin particle to be solved by Cryo-EM to date and its good resolution (2.7 Å) provides a well-defined view of the central NC-interface. On the other hand, the CiSEPT7-CiSEPT9 G-interface shows signs of fragility permitting toggling between hexamers and octamers, similar to that seen in human septins but not in yeast. The new structures provide insights concerning the molecular mechanism for cross-talk between adjacent interfaces. This indicates that C. intestinalis may represent a valuable tool for future studies, fulfilling the requirements of a complete but simpler system to understand the mechanisms behind the assembly and dynamics of septin filaments. | ||||||||||||
History |
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 211.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 20.7 KB 20.7 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 15.9 KB | Display | ![]() |
Images | ![]() | 82.9 KB | ||
Masks | ![]() | 421.9 MB | ![]() | |
Filedesc metadata | ![]() | 6.1 KB | ||
Others | ![]() ![]() ![]() ![]() | 398 MB 367.2 MB 391.1 MB 391.1 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 1 MB | Display | ![]() |
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Full document | ![]() | 1 MB | Display | |
Data in XML | ![]() | 24.6 KB | Display | |
Data in CIF | ![]() | 31.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 9bhwMC ![]() 9bhtC 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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Map
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Annotation | Raw map | ||||||||||||||||||||
Voxel size | X=Y=Z: 0.729 Å | ||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Mask #1
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-Additional map: Sharpened map
File | emd_44555_additional_1.map | ||||||||||||
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Annotation | Sharpened map | ||||||||||||
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-Additional map: DeepEMhancer map
File | emd_44555_additional_2.map | ||||||||||||
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Annotation | DeepEMhancer map | ||||||||||||
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-Half map: Half map B
File | emd_44555_half_map_1.map | ||||||||||||
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Annotation | Half map B | ||||||||||||
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Density Histograms |
-Half map: Half map B
File | emd_44555_half_map_2.map | ||||||||||||
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Annotation | Half map B | ||||||||||||
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Density Histograms |
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Sample components
-Entire : Ciona intestinalis Septin Tetrameric Complex SEPT7/SEPT9
Entire | Name: Ciona intestinalis Septin Tetrameric Complex SEPT7/SEPT9 |
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Components |
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-Supramolecule #1: Ciona intestinalis Septin Tetrameric Complex SEPT7/SEPT9
Supramolecule | Name: Ciona intestinalis Septin Tetrameric Complex SEPT7/SEPT9 type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#2 |
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Source (natural) | Organism: ![]() ![]() |
-Macromolecule #1: CiSeptin-7
Macromolecule | Name: CiSeptin-7 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 48.769039 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MVLLNQDMAQ QPKALDSYVG FANLPNQLYR KSVKQGFEFT LMVVGESGLG KSTLINSLFL SDLYSNEYPG PSLRIKKTVK VETTKVLIK ENGVTLRLTI DDTPGFGDAV DNSNCWQAVI NHIEKKFEDY LNAESMVTRS KLADNRVHCC LYFIAPTGHG L KPLDVEFM ...String: MVLLNQDMAQ QPKALDSYVG FANLPNQLYR KSVKQGFEFT LMVVGESGLG KSTLINSLFL SDLYSNEYPG PSLRIKKTVK VETTKVLIK ENGVTLRLTI DDTPGFGDAV DNSNCWQAVI NHIEKKFEDY LNAESMVTRS KLADNRVHCC LYFIAPTGHG L KPLDVEFM KNLHDKVNII PLIAKADTMT PEECLRFKKQ IMKEIHEHKI QLYEFPECED EEENRLNRKL KSRVPFAVVG SN TVLEIGG RRVRGRQYPW GVAEVENIDH CDFTVLRNML VRTHMQDLKD VTNNVHYENY RSKKLSSVTT TTMDGRSKAQ TKS PLAQME EEKSEHMQKM KKMEMEEVFR MKVHEKKQKL QESEADLSRR HEAMKKKLEA EYAALDEKQR QYEKDKQDFE ALQL KLMED RKSDNRTLGR KKKW UniProtKB: Septin |
-Macromolecule #2: Neuronal-specific septin-3
Macromolecule | Name: Neuronal-specific septin-3 / type: protein_or_peptide / ID: 2 / Number of copies: 2 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 41.559363 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: MTTPLEGYVG IDTLTEQIRK KALRQGFEFN VMVVGSAGLG KSTLVNTIFK SKVSRRQPEE DYHTPSTVEI KTISHVIEEK GILLKLSVT DTPGFGDQVD NTNCWQPIMR HVNEQYEKYL NEEISIKRRK RIPDTRVHCC IYFIPPSGHS LRLVDIEVMK R LVEIVNVI ...String: MTTPLEGYVG IDTLTEQIRK KALRQGFEFN VMVVGSAGLG KSTLVNTIFK SKVSRRQPEE DYHTPSTVEI KTISHVIEEK GILLKLSVT DTPGFGDQVD NTNCWQPIMR HVNEQYEKYL NEEISIKRRK RIPDTRVHCC IYFIPPSGHS LRLVDIEVMK R LVEIVNVI PVIAKSDSLT LEERERFKAT IQQQLIEHNI RVYPDLENLD VDDETERQRN LKLKERLPFA IVGSSTTHQV GS KAVLGRK AGWGVIEVEN DAHCEFNHLR NMIIRTNLQD LKEVTAQVHY ELYRHRRLET LKKVPLDSVG STPSSPSYDI TNS EPNHKK VANTPKLGET GKAIAASQKE VVEALSESKI WSHPQFEK UniProtKB: Neuronal-specific septin-3 |
-Macromolecule #3: GUANOSINE-5'-DIPHOSPHATE
Macromolecule | Name: GUANOSINE-5'-DIPHOSPHATE / type: ligand / ID: 3 / Number of copies: 4 / Formula: GDP |
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Molecular weight | Theoretical: 443.201 Da |
Chemical component information | ![]() ChemComp-GDP: |
-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: 8 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: FEI FALCON IV (4k x 4k) / Average electron dose: 41.8 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.5 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Initial model | Chain - Source name: AlphaFold / Chain - Initial model type: in silico model |
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Output model | ![]() PDB-9bhw: |