Function:Forms a voltage-independent potassium channel activated by intracellular calcium. Activation is followed by membrane hyperpolarization. Thought to regulate neuronal excitability by contributing to the slow component of synaptic afterhyperpolarization. The channel is blocked by apamin.,polymorphism:The second poly-Gln region of KCNN3 is highly polymorphic and the number of Gln varies from 12 to 28 in the population.,similarity:Belongs to the potassium channel KCNN family.,subunit:Heterooligomer. The complex is composed of 4 channel subunits each of which binds to a calmodulin subunit which regulates the channel activity through calcium-binding.,
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