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Open data
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Basic information
Entry | Database: PDB / ID: 8gi2 | ||||||
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Title | Cryo-EM structure of Natrinema sp. J7-2 Type IV pilus | ||||||
![]() | Natrinema pilin, Orf10 | ||||||
![]() | MOTOR PROTEIN / Helical / Pili / Natrinema / PROTEIN FIBRIL | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3 Å | ||||||
![]() | Sonani, R.R. / Kreutzberger, M.A.B. / Liu, Y. / Krupovic, M. / Egelman, E.H. | ||||||
Funding support | ![]()
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![]() | ![]() Title: The evolution of archaeal flagellar filaments. Authors: Mark A B Kreutzberger / Virginija Cvirkaite-Krupovic / Ying Liu / Diana P Baquero / Junfeng Liu / Ravi R Sonani / Chris R Calladine / Fengbin Wang / Mart Krupovic / Edward H Egelman / ![]() ![]() ![]() Abstract: Flagellar motility has independently arisen three times during evolution: in bacteria, archaea, and eukaryotes. In prokaryotes, the supercoiled flagellar filaments are composed largely of a single ...Flagellar motility has independently arisen three times during evolution: in bacteria, archaea, and eukaryotes. In prokaryotes, the supercoiled flagellar filaments are composed largely of a single protein, bacterial or archaeal flagellin, although these two proteins are not homologous, while in eukaryotes, the flagellum contains hundreds of proteins. Archaeal flagellin and archaeal type IV pilin are homologous, but how archaeal flagellar filaments (AFFs) and archaeal type IV pili (AT4Ps) diverged is not understood, in part, due to the paucity of structures for AFFs and AT4Ps. Despite having similar structures, AFFs supercoil, while AT4Ps do not, and supercoiling is essential for the function of AFFs. We used cryo-electron microscopy to determine the atomic structure of two additional AT4Ps and reanalyzed previous structures. We find that all AFFs have a prominent 10-strand packing, while AT4Ps show a striking structural diversity in their subunit packing. A clear distinction between all AFF and all AT4P structures involves the extension of the N-terminal α-helix with polar residues in the AFFs. Additionally, we characterize a flagellar-like AT4P from with filament and subunit structure similar to that of AFFs which can be viewed as an evolutionary link, showing how the structural diversity of AT4Ps likely allowed for an AT4P to evolve into a supercoiling AFF. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 35.5 KB | Display | ![]() |
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PDB format | ![]() | 22.8 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.2 MB | Display | ![]() |
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Full document | ![]() | 1.2 MB | Display | |
Data in XML | ![]() | 22.6 KB | Display | |
Data in CIF | ![]() | 30.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 40060MC ![]() 7txiC ![]() 8fj5C ![]() 8fjsC ![]() 8fk0C ![]() 8fk7C M: map data used to model this data C: citing same article ( |
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Links
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Assembly
Deposited unit | ![]()
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Symmetry | Helical symmetry: (Circular symmetry: 1 / Dyad axis: no / N subunits divisor: 1 / Num. of operations: 20 / Rise per n subunits: 4.954 Å / Rotation per n subunits: 108.72 °) |
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Components
#1: Protein | Mass: 17009.859 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: FILAMENT / 3D reconstruction method: helical reconstruction |
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Sample preparation
Component | Name: Type IV pili / Type: COMPLEX / Entity ID: all / Source: NATURAL |
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Source (natural) | Organism: ![]() |
Buffer solution | pH: 7.5 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1200 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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Helical symmerty | Angular rotation/subunit: 108.72 ° / Axial rise/subunit: 4.95 Å / Axial symmetry: C1 | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 261069 / Symmetry type: HELICAL | ||||||||||||||||||||||||
Refine LS restraints |
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