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- PDB-8zap: ExoC110T class 1 channelrhodopsin -

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Basic information

Entry
Database: PDB / ID: 8zap
TitleExoC110T class 1 channelrhodopsin
ComponentsC110T-class1
KeywordsMEMBRANE PROTEIN / Channelrhodopsin
Function / homology: / RETINAL
Function and homology information
Biological speciesHyphochytrium catenoides (eukaryote)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.6 Å
AuthorsZhang, M.F.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Commun / Year: 2024
Title: Channelrhodopsins with distinct chromophores and binding patterns.
Authors: Yuanyue Shan / Liping Zhao / Meiyu Chen / Xiao Li / Mingfeng Zhang / Duanqing Pei /
Abstract: Channelrhodopsins are popular optogenetic tools in neuroscience, but remain poorly understood mechanistically. Here we report the cryo-EM structures of channelrhodopsin-2 (ChR2) from Chlamydomonas ...Channelrhodopsins are popular optogenetic tools in neuroscience, but remain poorly understood mechanistically. Here we report the cryo-EM structures of channelrhodopsin-2 (ChR2) from Chlamydomonas reinhardtii and H. catenoides kalium channelrhodopsin (KCR1). We show that ChR2 recruits an endogenous N-retinylidene-PE-like molecule to a previously unidentified lateral retinal binding pocket, exhibiting a reduced light response in HEK293 cells. In contrast, H. catenoides kalium channelrhodopsin (KCR1) binds an endogenous retinal in its canonical retinal binding pocket under identical condition. However, exogenous ATR reduces the photocurrent magnitude of wild type KCR1 and also inhibits its leaky mutant C110T. Our results uncover diverse retinal chromophores with distinct binding patterns for channelrhodopsins in mammalian cells, which may further inspire next generation optogenetics for complex tasks such as cell fate control.
History
DepositionApr 25, 2024Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Sep 4, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: C110T-class1
B: C110T-class1
C: C110T-class1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)91,35630
Polymers89,5653
Non-polymers1,79227
Water64936
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein C110T-class1


Mass: 29854.945 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Hyphochytrium catenoides (eukaryote) / Production host: Homo sapiens (human)
#2: Chemical...
ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 24 / Source method: obtained synthetically / Formula: K / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-RET / RETINAL


Mass: 284.436 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C20H28O / Feature type: SUBJECT OF INVESTIGATION
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 36 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: exoC110T / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Hyphochytrium catenoides (eukaryote)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.2
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 2.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 154800 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0036633
ELECTRON MICROSCOPYf_angle_d0.5599040
ELECTRON MICROSCOPYf_dihedral_angle_d10.275907
ELECTRON MICROSCOPYf_chiral_restr0.04928
ELECTRON MICROSCOPYf_plane_restr0.0061111

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