8S3E

Structure of rabbit Slo1 in complex with gamma1/LRRC26

PDB DOI: https://doi.org/10.2210/pdb8S3E/pdb
EM Map EMD-19691: EMDB EMDataResource

Classification: MEMBRANE PROTEIN
Organism(s): Oryctolagus cuniculus
Expression System: Homo sapiens
Mutation(s): No

Deposited: 2024-02-20 Released: 2024-04-10
Deposition Author(s): Redhardt, M., Raunser, S., Raisch, T.
Funding Organization(s): Max Planck Society

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 2.39 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

Cryo-EM structure of the Slo1 potassium channel with the auxiliary gamma 1 subunit suggests a mechanism for depolarization-independent activation.

Redhardt, M., Raunser, S., Raisch, T.

(2024) FEBS Lett 598: 875-888

PubMed: 38553946 Search on PubMed
DOI: https://doi.org/10.1002/1873-3468.14863
Primary Citation of Related Structures:
8S3E

PubMed Abstract:
Mammalian Ca ²⁺-dependent Slo K ⁺ channels can stably associate with auxiliary γ subunits which fundamentally alter their behavior. By a so far unknown mechanism, the four γ subunits reduce the need for voltage-dependent activation and, thereby, allow Slo to open independently of an action potential. Here, using cryo-EM, we reveal how the transmembrane helix of γ1/LRRC26 binds and presumably stabilizes the activated voltage-sensor domain of Slo1. The activation is further enhanced by an intracellular polybasic stretch which locally changes the charge gradient across the membrane. Our data provide a possible explanation for Slo1 regulation by the four γ subunits and also their different activation efficiencies. This suggests a novel activation mechanism of voltage-gated ion channels by auxiliary subunits.

Organizational Affiliation

Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Dortmund, Germany.

Macromolecule Content

Total Structure Weight: 682.11 kDa
Atom Count: 31,585
Modelled Residue Count: 3,800
Deposited Residue Count: 5,836
Unique protein chains: 2

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Calcium-activated potassium channel subunit alpha-1	A, B, C, D	1,119	Oryctolagus cuniculus	Mutation(s): 0 Gene Names: KCNMA1, KCNMA
UniProt
Find proteins for Q9BG98 (Oryctolagus cuniculus) Explore Q9BG98 Go to UniProtKB: Q9BG98
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	Q9BG98
Sequence Annotations Expand
Reference Sequence

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(by identity cutoff) | 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Leucine-rich repeat-containing protein 26	E, F, G, H	340	Oryctolagus cuniculus	Mutation(s): 0
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
6PL Query on 6PL Download Ideal Coordinates CCD File SDF format, chain AB [auth C] SDF format, chain BA [auth B] SDF format, chain BB [auth C] SDF format, chain CB [auth C] SDF format, chain DB [auth C] SDF format, chain EB [auth C] SDF format, chain FB [auth C] SDF format, chain GB [auth C] SDF format, chain IA [auth B] SDF format, chain IB [auth D] SDF format, chain JA [auth B] SDF format, chain KA [auth B] SDF format, chain LA [auth B] SDF format, chain MA [auth B] SDF format, chain NA [auth B] SDF format, chain O [auth A] SDF format, chain OA [auth B] SDF format, chain P [auth A] SDF format, chain PA [auth B] SDF format, chain PB [auth D] SDF format, chain Q [auth A] SDF format, chain QB [auth D] SDF format, chain R [auth A] SDF format, chain RB [auth D] SDF format, chain S [auth A] SDF format, chain SA [auth C] SDF format, chain SB [auth D] SDF format, chain T [auth A] SDF format, chain TB [auth D] SDF format, chain U [auth A] SDF format, chain UB [auth D] SDF format, chain V [auth A] SDF format, chain VB [auth D] SDF format, chain WB [auth D] SDF format, chain X [auth A] SDF format, chain ZA [auth C] MOL2 format, chain AB [auth C] MOL2 format, chain BA [auth B] MOL2 format, chain BB [auth C] MOL2 format, chain CB [auth C] MOL2 format, chain DB [auth C] MOL2 format, chain EB [auth C] MOL2 format, chain FB [auth C] MOL2 format, chain GB [auth C] MOL2 format, chain IA [auth B] MOL2 format, chain IB [auth D] MOL2 format, chain JA [auth B] MOL2 format, chain KA [auth B] MOL2 format, chain LA [auth B] MOL2 format, chain MA [auth B] MOL2 format, chain NA [auth B] MOL2 format, chain O [auth A] MOL2 format, chain OA [auth B] MOL2 format, chain P [auth A] MOL2 format, chain PA [auth B] MOL2 format, chain PB [auth D] MOL2 format, chain Q [auth A] MOL2 format, chain QB [auth D] MOL2 format, chain R [auth A] MOL2 format, chain RB [auth D] MOL2 format, chain S [auth A] MOL2 format, chain SA [auth C] MOL2 format, chain SB [auth D] MOL2 format, chain T [auth A] MOL2 format, chain TB [auth D] MOL2 format, chain U [auth A] MOL2 format, chain UB [auth D] MOL2 format, chain V [auth A] MOL2 format, chain VB [auth D] MOL2 format, chain WB [auth D] MOL2 format, chain X [auth A] MOL2 format, chain ZA [auth C]	AB [auth C] BA [auth B] BB [auth C] CB [auth C] DB [auth C] AB [auth C], BA [auth B], BB [auth C], CB [auth C], DB [auth C], EB [auth C], FB [auth C], GB [auth C], IA [auth B], IB [auth D], JA [auth B], KA [auth B], LA [auth B], MA [auth B], NA [auth B], O [auth A], OA [auth B], P [auth A], PA [auth B], PB [auth D], Q [auth A], QB [auth D], R [auth A], RB [auth D], S [auth A], SA [auth C], SB [auth D], T [auth A], TB [auth D], U [auth A], UB [auth D], V [auth A], VB [auth D], WB [auth D], X [auth A], ZA [auth C]	(4S,7R)-4-HYDROXY-N,N,N-TRIMETHYL-9-OXO-7-[(PALMITOYLOXY)METHYL]-3,5,8-TRIOXA-4-PHOSPHAHEXACOSAN-1-AMINIUM 4-OXIDE C₄₂ H₈₅ N O₈ P PZNPLUBHRSSFHT-RRHRGVEJSA-O		Interactions Focus chain AB [auth C] Focus chain BA [auth B] Focus chain BB [auth C] Focus chain CB [auth C] Focus chain DB [auth C] Focus chain EB [auth C] Focus chain FB [auth C] Focus chain GB [auth C] Focus chain IA [auth B] Focus chain IB [auth D] Focus chain JA [auth B] Focus chain KA [auth B] Focus chain LA [auth B] Focus chain MA [auth B] Focus chain NA [auth B] Focus chain O [auth A] Focus chain OA [auth B] Focus chain P [auth A] Focus chain PA [auth B] Focus chain PB [auth D] Focus chain Q [auth A] Focus chain QB [auth D] Focus chain R [auth A] Focus chain RB [auth D] Focus chain S [auth A] Focus chain SA [auth C] Focus chain SB [auth D] Focus chain T [auth A] Focus chain TB [auth D] Focus chain U [auth A] Focus chain UB [auth D] Focus chain V [auth A] Focus chain VB [auth D] Focus chain WB [auth D] Focus chain X [auth A] Focus chain ZA [auth C] Interactions & Density Focus chain AB [auth C] Focus chain BA [auth B] Focus chain BB [auth C] Focus chain CB [auth C] Focus chain DB [auth C] Focus chain EB [auth C] Focus chain FB [auth C] Focus chain GB [auth C] Focus chain IA [auth B] Focus chain IB [auth D] Focus chain JA [auth B] Focus chain KA [auth B] Focus chain LA [auth B] Focus chain MA [auth B] Focus chain NA [auth B] Focus chain O [auth A] Focus chain OA [auth B] Focus chain P [auth A] Focus chain PA [auth B] Focus chain PB [auth D] Focus chain Q [auth A] Focus chain QB [auth D] Focus chain R [auth A] Focus chain RB [auth D] Focus chain S [auth A] Focus chain SA [auth C] Focus chain SB [auth D] Focus chain T [auth A] Focus chain TB [auth D] Focus chain U [auth A] Focus chain UB [auth D] Focus chain V [auth A] Focus chain VB [auth D] Focus chain WB [auth D] Focus chain X [auth A] Focus chain ZA [auth C]
CLR Query on CLR Download Ideal Coordinates CCD File SDF format, chain CA [auth B] SDF format, chain DA [auth B] SDF format, chain EA [auth B] SDF format, chain FA [auth B] SDF format, chain I [auth A] SDF format, chain J [auth A] SDF format, chain JB [auth D] SDF format, chain K [auth A] SDF format, chain KB [auth D] SDF format, chain L [auth A] SDF format, chain LB [auth D] SDF format, chain MB [auth D] SDF format, chain TA [auth C] SDF format, chain UA [auth C] SDF format, chain VA [auth C] SDF format, chain WA [auth C] MOL2 format, chain CA [auth B] MOL2 format, chain DA [auth B] MOL2 format, chain EA [auth B] MOL2 format, chain FA [auth B] MOL2 format, chain I [auth A] MOL2 format, chain J [auth A] MOL2 format, chain JB [auth D] MOL2 format, chain K [auth A] MOL2 format, chain KB [auth D] MOL2 format, chain L [auth A] MOL2 format, chain LB [auth D] MOL2 format, chain MB [auth D] MOL2 format, chain TA [auth C] MOL2 format, chain UA [auth C] MOL2 format, chain VA [auth C] MOL2 format, chain WA [auth C]	CA [auth B] DA [auth B] EA [auth B] FA [auth B] I [auth A] CA [auth B], DA [auth B], EA [auth B], FA [auth B], I [auth A], J [auth A], JB [auth D], K [auth A], KB [auth D], L [auth A], LB [auth D], MB [auth D], TA [auth C], UA [auth C], VA [auth C], WA [auth C]	CHOLESTEROL C₂₇ H₄₆ O HVYWMOMLDIMFJA-DPAQBDIFSA-N		Interactions Focus chain CA [auth B] Focus chain DA [auth B] Focus chain EA [auth B] Focus chain FA [auth B] Focus chain I [auth A] Focus chain J [auth A] Focus chain JB [auth D] Focus chain K [auth A] Focus chain KB [auth D] Focus chain L [auth A] Focus chain LB [auth D] Focus chain MB [auth D] Focus chain TA [auth C] Focus chain UA [auth C] Focus chain VA [auth C] Focus chain WA [auth C] Interactions & Density Focus chain CA [auth B] Focus chain DA [auth B] Focus chain EA [auth B] Focus chain FA [auth B] Focus chain I [auth A] Focus chain J [auth A] Focus chain JB [auth D] Focus chain K [auth A] Focus chain KB [auth D] Focus chain L [auth A] Focus chain LB [auth D] Focus chain MB [auth D] Focus chain TA [auth C] Focus chain UA [auth C] Focus chain VA [auth C] Focus chain WA [auth C]
CA Query on CA Download Ideal Coordinates CCD File SDF format, chain GA [auth B] SDF format, chain HA [auth B] SDF format, chain M [auth A] SDF format, chain N [auth A] SDF format, chain NB [auth D] SDF format, chain OB [auth D] SDF format, chain XA [auth C] SDF format, chain YA [auth C] MOL2 format, chain GA [auth B] MOL2 format, chain HA [auth B] MOL2 format, chain M [auth A] MOL2 format, chain N [auth A] MOL2 format, chain NB [auth D] MOL2 format, chain OB [auth D] MOL2 format, chain XA [auth C] MOL2 format, chain YA [auth C]	GA [auth B] HA [auth B] M [auth A] N [auth A] NB [auth D] GA [auth B], HA [auth B], M [auth A], N [auth A], NB [auth D], OB [auth D], XA [auth C], YA [auth C]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N		Interactions Focus chain GA [auth B] Focus chain HA [auth B] Focus chain M [auth A] Focus chain N [auth A] Focus chain NB [auth D] Focus chain OB [auth D] Focus chain XA [auth C] Focus chain YA [auth C] Interactions & Density Focus chain GA [auth B] Focus chain HA [auth B] Focus chain M [auth A] Focus chain N [auth A] Focus chain NB [auth D] Focus chain OB [auth D] Focus chain XA [auth C] Focus chain YA [auth C]
K Query on K Download Ideal Coordinates CCD File SDF format, chain QA [auth B] SDF format, chain XB [auth D] SDF format, chain Y [auth A] SDF format, chain Z [auth A] MOL2 format, chain QA [auth B] MOL2 format, chain XB [auth D] MOL2 format, chain Y [auth A] MOL2 format, chain Z [auth A]	QA [auth B], XB [auth D], Y [auth A], Z [auth A]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N		Interactions Focus chain QA [auth B] Focus chain XB [auth D] Focus chain Y [auth A] Focus chain Z [auth A] Interactions & Density Focus chain QA [auth B] Focus chain XB [auth D] Focus chain Y [auth A] Focus chain Z [auth A]
MG Query on MG Download Ideal Coordinates CCD File SDF format, chain AA [auth B] SDF format, chain HB [auth D] SDF format, chain RA [auth C] SDF format, chain W [auth A] MOL2 format, chain AA [auth B] MOL2 format, chain HB [auth D] MOL2 format, chain RA [auth C] MOL2 format, chain W [auth A]	AA [auth B], HB [auth D], RA [auth C], W [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Interactions Focus chain AA [auth B] Focus chain HB [auth D] Focus chain RA [auth C] Focus chain W [auth A] Interactions & Density Focus chain AA [auth B] Focus chain HB [auth D] Focus chain RA [auth C] Focus chain W [auth A]