期刊
MOLECULAR PLANT
卷 7, 期 9, 页码 1441-1454出版社
CELL PRESS
DOI: 10.1093/mp/ssu065
关键词
stomatal function; microtubule dynamics; hormone signaling
资金
- NSF [0843617]
- NIH [GM060396]
Reorganization of the cortical microtubule cytoskeleton is critical for guard cell function. Here, we investigate how environmental and hormonal signals cause these rearrangements and find that COP1, a RING-finger-type ubiquitin E3 ligase, is required for degradation of tubulin, likely by the 26S proteasome. This degradation is required for stomatal closing. In addition to regulating the cytoskeleton, we show that cop1 mutation impaired the activity of S-type anion channels, which are critical for stomatal closure. Thus, COP1 is revealed as a potential coordinator of cytoskeletal and electrophysiological activities required for guard cell function.
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