Science advances · 2026
AKT5 is a bona fide potassium channel and controls petiole growth in Arabidopsis.
СтатьяНазвание и аннотация: Перевод в очереди
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Muraoka Yuki, Kobayashi Shunsuke, Oskam Lisa, Tateyama Michihiro, Masago Ayumu, Tanaka Yoshikazu, Yokoyama Takeshi, Furuta Tadaomi, Takase Hinano, Tanudjaja Ellen, Terashima Shota, Shimizukawa Haruto, Yamanashi Taro, Saito Shunya, Ijima Hiroki, Tanaka Miyuki, Miyamoto Atsushi, Kato Megumi, Sato Kanane, Tsujii Masaru, Umezawa Taishi, Quintero Francisco J, Rubio Francisco, Kudla Jörg, Ito Masaaki, Kubo Yoshihiro, Ishimaru Yasuhiro, Pierik Ronald, Uozumi Nobuyuki
Аннотация
Potassium ion (K+) is essential for plant growth and development. Despite decades of study, the Shaker-type K+ channel AKT5 has remained functionally unassigned. Here, we report that AKT5 functions as a bona fide voltage-dependent K+ channel and serves as an essential regulator of petiole elongation. Structural analyses of AKT5 in a closed state and the AKT5-D403 variant in a pre-open state provide direct structural evidence for functional K+ channel activity. AKT5 assembled into a canonical tetramer with two-fold symmetry and, upon phosphorylation, operated as an inward-rectifying K+ channel activated at strongly hyperpolarized membrane potentials. AKT5 was predominantly expressed in young petioles, and loss of AKT5 function largely suppressed petiole elongation throughout the diurnal cycle, resulting in compact rosettes and reduced biomass under crowded growth conditions. These findings show that AKT5 is involved in a regulator of plant competitive growth and high-density performance.