Abstract

The hyperpolarization activated potassium channel from Arabidopsis thaliana KAT1 has been shown to regulate stomatal opening. Like some depolarization activated potassium channels KAT1 has a voltage sensing domain (VSD) and a pore domain (PD) in a non-domain-swapped conformation. Its structure prominently displays a phospholipid molecule intercalated between the S4 and S5 in the transmembrane region. Hyperpolarization-induced currents from KAT1, expressed in Xenopus laevis oocytes, were used to evaluate the effect of temperature (20-30°C).

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