在光质变化过程中，肌动蛋白丝的重组需要SCAB3。
SCAB3 Is Required for Reorganization of Actin Filaments during Light Quality Changes.
作者信息
Wang Chongwu, Zheng Yuan, Zhao Yang, Zhao Yi, Li Jigang, Guo Yan
机构信息
State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
School of Life Science & Technology, Nanyang Normal University, Nanyang 473061, China.
出版信息
J Genet Genomics. 2015 Apr 20;42(4):161-8. doi: 10.1016/j.jgg.2015.02.005. Epub 2015 Feb 23.
The stomatal closure-related actin binding protein (SCAB) family is plant-specific, and its members all contain a novel actin binding domain. Here, we report that SCAB3, a homolog of SCAB1, binds, stabilizes and bundles actin filaments. The SCAB3 promoter contains a cis-element which could be bound by the FHY3/FAR1 transcription factors. Consistently, the expression of SCAB3 is induced when plants were transferred from white light to far red light (T-Far Red) conditions. The scab3 mutants show defects in the control of hypocotyl elongation under T-Far Red condition, which may result from an impaired reorganization of actin filaments. Together, our results suggest that SCAB3 plays an important role in plant growth under changes of light conditions possibly by regulating actin filament dynamics.
气孔关闭相关肌动蛋白结合蛋白（SCAB）家族是植物特有的，其成员均含有一个新的肌动蛋白结合结构域。在此，我们报道SCAB1的同源物SCAB3能结合、稳定并捆绑肌动蛋白丝。SCAB3启动子包含一个可被FHY3/FAR1转录因子结合的顺式元件。一致的是，当植物从白光转移到远红光（T-远红光）条件下时，SCAB3的表达被诱导。scab3突变体在T-远红光条件下的下胚轴伸长控制方面表现出缺陷，这可能是由于肌动蛋白丝重组受损所致。总之，我们的结果表明，SCAB3可能通过调节肌动蛋白丝动力学在光照条件变化下的植物生长中发挥重要作用。
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