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Open data
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Basic information
Entry | Database: EMDB / ID: EMD-3726 | |||||||||
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Title | BtubABC mini microtubule | |||||||||
![]() | BtubABC mini microtubule | |||||||||
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![]() | bacterial cytoskeleton / microtubules / structural protein | |||||||||
Function / homology | ![]() chloroplast organization / microtubule-based process / structural constituent of cytoskeleton / microtubule / hydrolase activity / protein serine/threonine kinase activity / GTPase activity / GTP binding Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | helical reconstruction / cryo EM / Resolution: 3.6 Å | |||||||||
![]() | Deng X / Bharat TAM | |||||||||
![]() | ![]() Title: Four-stranded mini microtubules formed by BtubAB show dynamic instability. Authors: Xian Deng / Gero Fink / Tanmay A M Bharat / Shaoda He / Danguole Kureisaite-Ciziene / Jan Löwe / ![]() Abstract: Microtubules, the dynamic, yet stiff hollow tubes built from αβ-tubulin protein heterodimers, are thought to be present only in eukaryotic cells. Here, we report a 3.6-Å helical reconstruction ...Microtubules, the dynamic, yet stiff hollow tubes built from αβ-tubulin protein heterodimers, are thought to be present only in eukaryotic cells. Here, we report a 3.6-Å helical reconstruction electron cryomicroscopy structure of four-stranded mini microtubules formed by bacterial tubulin-like BtubAB proteins. Despite their much smaller diameter, mini microtubules share many key structural features with eukaryotic microtubules, such as an M-loop, alternating subunits, and a seam that breaks overall helical symmetry. Using in vitro total internal reflection fluorescence microscopy, we show that bacterial mini microtubules treadmill and display dynamic instability, another hallmark of eukaryotic microtubules. The third protein in the gene cluster, BtubC, previously known as "bacterial kinesin light chain," binds along protofilaments every 8 nm, inhibits BtubAB mini microtubule catastrophe, and increases rescue. Our work reveals that some bacteria contain regulated and dynamic cytomotive microtubule systems that were once thought to be only useful in much larger and sophisticated eukaryotic cells. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 78.1 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 13.9 KB 13.9 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 9.8 KB | Display | ![]() |
Images | ![]() | 182.7 KB | ||
Filedesc metadata | ![]() | 5.9 KB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 328.1 KB | Display | ![]() |
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Full document | ![]() | 327.3 KB | Display | |
Data in XML | ![]() | 11.2 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 5o09MC ![]() 5o01C M: atomic model generated by this map C: citing same article ( |
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Similar structure data |
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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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Annotation | BtubABC mini microtubule | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.34 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
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Sample components
-Entire : BtubABC mini microtubule
Entire | Name: BtubABC mini microtubule |
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Components |
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-Supramolecule #1: BtubABC mini microtubule
Supramolecule | Name: BtubABC mini microtubule / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#3 |
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-Supramolecule #2: BtubABC mini microtubule
Supramolecule | Name: BtubABC mini microtubule / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1-#2 |
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Source (natural) | Organism: ![]() |
-Supramolecule #3: BtubABC mini microtubule
Supramolecule | Name: BtubABC mini microtubule / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #3 |
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Source (natural) | Organism: ![]() |
-Macromolecule #1: Tubulin
Macromolecule | Name: Tubulin / type: protein_or_peptide / ID: 1 / Number of copies: 8 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 47.071582 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: VNNTIVVSIG QAGNQIAASF WKTVCLEHGI DPLTGQTAPG VAPRGNWSSF FSKLGESSSG SYVPRAIMVD LEPSVIDNVK ATSGSLFNP ANLISRTEGA GGNFAVGYLG AGREVLPEVM SRLDYEIDKC DNVGGIIVLH AIGGGTGSGF GALLIESLKE K YGEIPVLS ...String: VNNTIVVSIG QAGNQIAASF WKTVCLEHGI DPLTGQTAPG VAPRGNWSSF FSKLGESSSG SYVPRAIMVD LEPSVIDNVK ATSGSLFNP ANLISRTEGA GGNFAVGYLG AGREVLPEVM SRLDYEIDKC DNVGGIIVLH AIGGGTGSGF GALLIESLKE K YGEIPVLS CAVLPSPQVS SVVTEPYNTV FALNTLRRSA DACLIFDNEA LFDLAHRKWN IESPTVDDLN LLITEALAGI TA SMRFSGF LTVEITLREL LTNLVPQPSL HFLMCAFAPL TPPDRSKFEE LGIEEMIKSL FDNGSVFAAC SPMEGRFLST AVL YRGIME DKPLADAALA AMREKLPLTY WIPTAFKIGY VEQPGISHRK SMVLLANNTE IARVLDRICH NFDKLWQRKA FANW YLNEG MSEEQINVLR ASAQELVQSY QVAEESGA UniProtKB: Tubulin |
-Macromolecule #2: Tubulin BtubB
Macromolecule | Name: Tubulin BtubB / type: protein_or_peptide / ID: 2 / Number of copies: 8 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 46.465508 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: VREILSIHVG QCGNQIADSF WRLALREHGL TEAGTLKEGS NAAANSNMEV FFHKVRDGKY VPRAVLVDLE PGVIARIEGG DMSQLFDES SIVRKIPGAA NNWARGYNVE GEKVIDQIMN VIDSAVEKTK GLQGFLMTHS IGGGSGSGLG SLILERLRQA Y PKKRIFTF ...String: VREILSIHVG QCGNQIADSF WRLALREHGL TEAGTLKEGS NAAANSNMEV FFHKVRDGKY VPRAVLVDLE PGVIARIEGG DMSQLFDES SIVRKIPGAA NNWARGYNVE GEKVIDQIMN VIDSAVEKTK GLQGFLMTHS IGGGSGSGLG SLILERLRQA Y PKKRIFTF SVVPSPLISD SAVEPYNAIL TLQRILDNAD GAVLLDNEAL FRIAKAKLNR SPNYMDLNNI IALIVSSVTA SL RFPGKLN TDLSEFVTNL VPFPGNHFLT ASFAPMRGAG QEGQVRTNFP DLARETFAQD NFTAAIDWQQ GVYLAASALF RGD VKAKDV DENMATIRKS LNYASYMPAS GGLKLGYAET APEGFASSGL ALVNHTGIAA VFERLIAQFD IMFDNHAYTH WYEN AGVSR DMMAKARNQI ATLAQSYRDA S UniProtKB: Tubulin BtubB |
-Macromolecule #3: Bacterial kinesin light chain
Macromolecule | Name: Bacterial kinesin light chain / type: protein_or_peptide / ID: 3 / Number of copies: 8 / Enantiomer: LEVO |
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Source (natural) | Organism: ![]() |
Molecular weight | Theoretical: 27.135703 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: DTALERQIAS ASRSVEEARR LAYHDPIRVG ALVEQISVLA DLRQKEGDFR KAESLYREAL FRAQELRKQD PDLLTGIYSL LAHLYDRWG RMDKAAEFYE LALKISAENG LEESDKVATI KNNLAMIFKQ LRKFERAEGY YCEALETFQR LDGEQSARVA S VYNNLGVL ...String: DTALERQIAS ASRSVEEARR LAYHDPIRVG ALVEQISVLA DLRQKEGDFR KAESLYREAL FRAQELRKQD PDLLTGIYSL LAHLYDRWG RMDKAAEFYE LALKISAENG LEESDKVATI KNNLAMIFKQ LRKFERAEGY YCEALETFQR LDGEQSARVA S VYNNLGVL YYSHMDVDRA QVMHERALAI RQNLHEGQMD PADLSQTFIN LGAVYKAAGD FQKAEACVDR AKRIRAAMNG UniProtKB: Bacterial kinesin light chain |
-Macromolecule #4: GUANOSINE-5'-DIPHOSPHATE
Macromolecule | Name: GUANOSINE-5'-DIPHOSPHATE / type: ligand / ID: 4 / Number of copies: 16 / 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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![]() | helical reconstruction |
Aggregation state | helical array |
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Sample preparation
Buffer | pH: 7.7 |
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Vitrification | Cryogen name: ETHANE / Instrument: FEI VITROBOT MARK IV |
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Electron microscopy
Microscope | FEI POLARA 300 |
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Image recording | Film or detector model: FEI FALCON II (4k x 4k) / Detector mode: INTEGRATING / Number real images: 6105 / Average electron dose: 40.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Tecnai Polara / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Space: RECIPROCAL / Protocol: OTHER / Target criteria: R-factor |
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Output model | ![]() PDB-5o09: |