Zinc is a key regulator of the sperm-specific K(+) channel (Slo3) function.

Intracellular zinc directly inhibits the sperm-specific Slo3 potassium channel by up to micromolar concentrations, with slow dissociation dynamics, affecting sperm capacitation.

• Why it matters: Understanding zinc's regulatory role is crucial because Slo3 activity influences sperm fertility and the capacitation process, yet the mechanisms of zinc modulation remain unclear.
• What they did: The study combined electrophysiology, molecular dynamics simulations, and mutagenesis in Xenopus oocytes to investigate zinc's effects on mouse Slo3, revealing dose-dependent inhibition and identifying key amino acids involved.
• The result: Findings demonstrate that zinc modulates Slo3 function during sperm capacitation, highlighting zinc's importance in regulating ion channels essential for fertility and opening avenues for fertility-related research.