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- PDB-9r21: Cryo-EM structure of the flotillin-associated rhodopsin PsFAR in ... -
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Basic information
Entry | Database: PDB / ID: 9r21 | ||||||||||||
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Title | Cryo-EM structure of the flotillin-associated rhodopsin PsFAR in detergent micelle | ||||||||||||
![]() | flotillin-associated rhodopsin | ||||||||||||
![]() | MEMBRANE PROTEIN / flotillin / rhodopsin / retinal | ||||||||||||
Function / homology | EICOSANE![]() | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.56 Å | ||||||||||||
![]() | Kovalev, K. / Stetsenko, A. / Marin, E. / Guskov, A. | ||||||||||||
Funding support | ![]() ![]()
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![]() | ![]() Title: Structural basis for no retinal binding in flotillin-associated rhodopsins. Authors: Kirill Kovalev / Artem Stetsenko / Florian Trunk / Egor Marin / Jose M Haro-Moreno / Gerrit H U Lamm / Alexey Alekseev / Francisco Rodriguez-Valera / Thomas R Schneider / Josef Wachtveitl / Albert Guskov / ![]() ![]() ![]() Abstract: Rhodopsins are light-sensitive membrane proteins capturing solar energy via a retinal cofactor covalently attached to a lysine residue. Several groups of rhodopsins lack the conserved lysine and ...Rhodopsins are light-sensitive membrane proteins capturing solar energy via a retinal cofactor covalently attached to a lysine residue. Several groups of rhodopsins lack the conserved lysine and showed no retinal binding. Recently, flotillin-associated rhodopsins (FArhodopsins or FARs) were identified and suggested to lack the retinal-binding pocket despite preserving the lysine residue in many members of the group. Here, we present cryoelectron microscopic (cryo-EM) structures of paralog FArhodopsin and proteorhodopsin from marine bacterium Pseudothioglobus, both forming pentamers similar to those of other microbial rhodopsins. We demonstrate no binding of retinal to the FArhodopsin despite preservation of the lysine residue and overall similarity of the protein fold and internal organization to those of the retinal-binding paralog. Mutational analysis confirmed that two amino acids, H84 and E120, prevent retinal binding within the FArhodopsin. Our work provides insights into the natural retinal loss in microbial rhodopsins and might contribute to the further understanding of FArhodopsins. | ||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 257.9 KB | Display | ![]() |
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PDB format | ![]() | 210.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 2.6 MB | Display | ![]() |
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Full document | ![]() | 2.6 MB | Display | |
Data in XML | ![]() | 55.2 KB | Display | |
Data in CIF | ![]() | 76.2 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 53519MC ![]() 9r22C ![]() 9r23C M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
#1: Protein | Mass: 27518.244 Da / Num. of mol.: 5 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #2: Chemical | ChemComp-LFA / #3: Water | ChemComp-HOH / | Has ligand of interest | N | Has protein modification | N | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: flotillin-associated rhodopsin PsFAR / Type: COMPLEX / Details: pentamer of the protein in detergent micelle / Entity ID: #1 / Source: RECOMBINANT |
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Molecular weight | Value: 0.135 MDa / Experimental value: NO |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 8 |
Specimen | Conc.: 10 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 288 K / Details: Blotting 4-6 second, force 0 |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: TFS KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 500 nm |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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3D reconstruction | Resolution: 2.56 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 212403 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement | Resolution: 2.56→108.68 Å / Cor.coef. Fo:Fc: 0.567 / SU B: 7.248 / SU ML: 0.14 / ESU R: 0.417 Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES Details: HYDROGENS HAVE BEEN USED IF PRESENT IN THE INPUT
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Solvent computation | Solvent model: PARAMETERS FOR MASK CACLULATION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 45.843 Å2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement step | Cycle: 1 / Total: 10231 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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