Studies on vesicle trafficking factors involving in chloroplast photorelocation movement

为了优化它们的光合作用能力，叶绿体改变它们在细胞中的位置以响应波动的环境光。叶绿体向低强度光运动（光积累响应），相反地，叶绿体避开入射强光（光回避响应）。本研究从蓝光感知到基于肌动蛋白的叶绿体运动的信号转导机制中涉及的信号因子（phot2, ARF1, JAC1, CHUP1）分别在其亚细胞定位，在囊泡运输中的细胞功能和分子相互作用方面进行了论证。此外，CHUP1在叶绿体肌动蛋白丝对蓝光响应的动态调节中起关键作用。

To optimize their photosynthetic ability, chloroplasts change their positioning in cells in response to fluctuating environmental light. Chloroplasts move toward low intensity light (photoaccumulation response), conversely they avoid from the incident strong light (photoavoidance response). In this study, the signaling factors (phot2, ARF1, JAC1, CHUP1) involving in the signal transduction mechanism from blue light perception to actin-based chloroplast movements were demonstrated on their subcellular localizations, cellular functions in vesicle trafficking, and molecular interactions, respectively. Furthermore, it was also suggested that CHUP1 plays a pivotal role in the regulation of chloroplast actin filament dynamics in response to blue light.