7PXF

Ca2+ free Drosophila Slo channel

Summary for 7PXF

• Entry DOI: 10.2210/pdb7pxf/pdb
• EMDB information: 13701
• Descriptor: Isoform J of Calcium-activated potassium channel slowpoke, MAGNESIUM ION, POTASSIUM ION (3 entities in total)
• Functional Keywords: potassium transport, bk channel, transport protein
• Biological source: Drosophila melanogaster (Fruit fly)
• Total number of polymer chains: 4
• Total formula weight: 523890.89

Authors

Raisch, T.,Brockmann, A.,Ebbinghaus-Kintscher, U.,Freigang, J.,Gutbrod, O.,Kubicek, J.,Maertens, B.,Hofnagel, O.,Raunser, S. (deposition date: 2021-10-08, release date: 2021-12-15, Last modification date: 2024-07-17)

Primary citation

Raisch, T.,Brockmann, A.,Ebbinghaus-Kintscher, U.,Freigang, J.,Gutbrod, O.,Kubicek, J.,Maertens, B.,Hofnagel, O.,Raunser, S.
Small molecule modulation of the Drosophila Slo channel elucidated by cryo-EM.
Nat Commun, 12:7164-7164, 2021

PubMed Abstract: Slowpoke (Slo) potassium channels display extraordinarily high conductance, are synergistically activated by a positive transmembrane potential and high intracellular Ca concentrations and are important targets for insecticides and antiparasitic drugs. However, it is unknown how these compounds modulate ion translocation and whether there are insect-specific binding pockets. Here, we report structures of Drosophila Slo in the Ca-bound and Ca-free form and in complex with the fungal neurotoxin verruculogen and the anthelmintic drug emodepside. Whereas the architecture and gating mechanism of Slo channels are conserved, potential insect-specific binding pockets exist. Verruculogen inhibits K transport by blocking the Ca-induced activation signal and precludes K from entering the selectivity filter. Emodepside decreases the conductance by suboptimal K coordination and uncouples ion gating from Ca and voltage sensing. Our results expand the mechanistic understanding of Slo regulation and lay the foundation for the rational design of regulators of Slo and other voltage-gated ion channels.

PubMed: 34887422
DOI: 10.1038/s41467-021-27435-w

Experimental method

ELECTRON MICROSCOPY (2.68 Å)