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S-acylated and nucleus-localized SALT OVERLY SENSITIVE3/CALCINEURIN B-LIKE4 stabilizes GIGANTEA to regulate Arabidopsis flowering time under salt stress.
The Plant Cell ( IF 11.6 ) Pub Date : 2023-01-02 , DOI: 10.1093/plcell/koac289
Hee Jin Park 1, 2 , Francisco M Gámez-Arjona 3, 4 , Marika Lindahl 3 , Rashid Aman 5 , Irene Villalta 6 , Joon-Yung Cha 5 , Raul Carranco 3 , Chae Jin Lim 1 , Elena García 3 , Ray A Bressan 7 , Sang Yeol Lee 5 , Federico Valverde 3 , Clara Sánchez-Rodríguez 4 , Jose M Pardo 3 , Woe-Yeon Kim 5, 8 , Francisco J Quintero 3 , Dae-Jin Yun 1, 9
Affiliation  

The precise timing of flowering in adverse environments is critical for plants to secure reproductive success. We report a mechanism in Arabidopsis (Arabidopsis thaliana) controlling the time of flowering by which the S-acylation-dependent nuclear import of the protein SALT OVERLY SENSITIVE3/CALCINEURIN B-LIKE4 (SOS3/CBL4), a Ca2+-signaling intermediary in the plant response to salinity, results in the selective stabilization of the flowering time regulator GIGANTEA inside the nucleus under salt stress, while degradation of GIGANTEA in the cytosol releases the protein kinase SOS2 to achieve salt tolerance. S-acylation of SOS3 was critical for its nuclear localization and the promotion of flowering, but partly dispensable for salt tolerance. SOS3 interacted with the photoperiodic flowering components GIGANTEA and FLAVIN-BINDING, KELCH REPEAT, F-BOX1 and participated in the transcriptional complex that regulates CONSTANS to sustain the transcription of CO and FLOWERING LOCUS T under salinity. Thus, the SOS3 protein acts as a Ca2+- and S-acylation-dependent versatile regulator that fine-tunes flowering time in a saline environment through the shared spatial separation and selective stabilization of GIGANTEA, thereby connecting two signaling networks to co-regulate the stress response and the time of flowering.

中文翻译:

S-酰化和细胞核定位的 SALT OVERLY SENSITIVE3/CALCINEURIN B-LIKE4 可稳定 GIGANTEA 以调节拟南芥在盐胁迫下的开花时间。

在不利环境中开花的精确时间对于植物确保繁殖成功至关重要。我们报告了拟南芥 (Arabidopsis thaliana) 中一种控制开花时间的机制,通过该机制,S-酰化依赖性核导入蛋白质 SALT OVERLY SENSITIVE3/CALCINEURIN B-LIKE4 (SOS3/CBL4),植物中的一种 Ca2+ 信号传导中介体响应盐度,导致开花时间调节剂 GIGANTEA 在盐胁迫下选择性稳定在细胞核内,而 GIGANTEA 在胞质溶胶中的降解释放蛋白激酶 SOS2 以实现耐盐性。SOS3 的 S-酰化对于其核定位和促进开花至关重要,但对于耐盐性来说部分是可有可无的。SOS3 与光周期开花成分 GIGANTEA 和 FLAVIN-BINDING、KELCH REPEAT、F-BOX1 并参与调节 CONSTANS 的转录复合物以维持盐度下 CO 和 FLOWERING LOCUS T 的转录。因此,SOS3 蛋白充当 Ca2+ 和 S-酰化依赖性多功能调节剂,通过 GIGANTEA 的共享空间分离和选择性稳定来微调盐碱环境中的开花时间,从而连接两个信号网络共同调节胁迫响应和开花时间。
更新日期:2022-09-22
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