8ZAO

ExoKCR1 channelrhodopsin

PDB DOI: https://doi.org/10.2210/pdb8ZAO/pdb
EM Map EMD-39882: EMDB EMDataResource

Classification: MEMBRANE PROTEIN
Organism(s): Hyphochytrium catenoides
Expression System: Homo sapiens
Mutation(s): No

Deposited: 2024-04-25 Released: 2024-09-04
Deposition Author(s): Zhang, M.F.
Funding Organization(s): Not funded

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 2.60 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

This is version 1.1 of the entry. See complete history.

Literature

Channelrhodopsins with distinct chromophores and binding patterns.

Shan, Y., Zhao, L., Chen, M., Li, X., Zhang, M., Pei, D.

(2024) Nat Commun 15: 7292

PubMed: 39181878 Search on PubMedSearch on PubMed Central
DOI: https://doi.org/10.1038/s41467-024-51811-x
Primary Citation of Related Structures:
8ZAM, 8ZAN, 8ZAO, 8ZAP, 8ZAQ

PubMed 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 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.

Organizational Affiliation

Laboratory of Cell Fate Control, School of Life Sciences, Westlake University, Hangzhou, China.

Macromolecule Content

Total Structure Weight: 91.01 kDa
Atom Count: 6,432
Modelled Residue Count: 777
Deposited Residue Count: 777
Unique protein chains: 1

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
exoKCR1	A, B, C	259	Hyphochytrium catenoides	Mutation(s): 0
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
RET (Subject of Investigation/LOI) Query on RET Download Ideal Coordinates CCD File SDF format, chain I [auth A] SDF format, chain O [auth B] SDF format, chain U [auth C] MOL2 format, chain I [auth A] MOL2 format, chain O [auth B] MOL2 format, chain U [auth C] mmCIF format, chain I [auth A] mmCIF format, chain O [auth B] mmCIF format, chain U [auth C]	I [auth A], O [auth B], U [auth C]	RETINAL C₂₀ H₂₈ O NCYCYZXNIZJOKI-OVSJKPMPSA-N		Interactions Focus chain I [auth A] Focus chain O [auth B] Focus chain U [auth C] Interactions & Density Focus chain I [auth A] Focus chain O [auth B] Focus chain U [auth C]
K (Subject of Investigation/LOI) Query on K Download Ideal Coordinates CCD File SDF format, chain D [auth A] SDF format, chain E [auth A] SDF format, chain F [auth A] SDF format, chain G [auth A] SDF format, chain H [auth A] SDF format, chain J [auth B] SDF format, chain K [auth B] SDF format, chain L [auth B] SDF format, chain M [auth B] SDF format, chain N [auth B] SDF format, chain P [auth C] SDF format, chain Q [auth C] SDF format, chain R [auth C] SDF format, chain S [auth C] SDF format, chain T [auth C] MOL2 format, chain D [auth A] MOL2 format, chain E [auth A] MOL2 format, chain F [auth A] MOL2 format, chain G [auth A] MOL2 format, chain H [auth A] MOL2 format, chain J [auth B] MOL2 format, chain K [auth B] MOL2 format, chain L [auth B] MOL2 format, chain M [auth B] MOL2 format, chain N [auth B] MOL2 format, chain P [auth C] MOL2 format, chain Q [auth C] MOL2 format, chain R [auth C] MOL2 format, chain S [auth C] MOL2 format, chain T [auth C] mmCIF format, chain D [auth A] mmCIF format, chain E [auth A] mmCIF format, chain F [auth A] mmCIF format, chain G [auth A] mmCIF format, chain H [auth A] mmCIF format, chain J [auth B] mmCIF format, chain K [auth B] mmCIF format, chain L [auth B] mmCIF format, chain M [auth B] mmCIF format, chain N [auth B] mmCIF format, chain P [auth C] mmCIF format, chain Q [auth C] mmCIF format, chain R [auth C] mmCIF format, chain S [auth C] mmCIF format, chain T [auth C]	D [auth A] E [auth A] F [auth A] G [auth A] H [auth A] D [auth A], E [auth A], F [auth A], G [auth A], H [auth A], J [auth B], K [auth B], L [auth B], M [auth B], N [auth B], P [auth C], Q [auth C], R [auth C], S [auth C], T [auth C]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N		Interactions Focus chain D [auth A] Focus chain E [auth A] Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain J [auth B] Focus chain K [auth B] Focus chain L [auth B] Focus chain M [auth B] Focus chain N [auth B] Focus chain P [auth C] Focus chain Q [auth C] Focus chain R [auth C] Focus chain S [auth C] Focus chain T [auth C] Interactions & Density Focus chain D [auth A] Focus chain E [auth A] Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain J [auth B] Focus chain K [auth B] Focus chain L [auth B] Focus chain M [auth B] Focus chain N [auth B] Focus chain P [auth C] Focus chain Q [auth C] Focus chain R [auth C] Focus chain S [auth C] Focus chain T [auth C]