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Phytochrome degradation
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DOI：10.1046/j.1365-3040.1997.d01-107.x.png)
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摘要
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Plants actively modulate the levels of the various phytochrome isoforms during their life cycle to optimize light absorption and perception, For phytochrome A (phyA), one of the most influential methods of control is selective turnover of the photoreceptor upon photoconversion from the red-absorbing form (Pr) to the far red-absorbing form (Pfr), Whereas the Pr form has a half-life of approximately 1 week, the Pfr form is rapidly degraded with a half-life of 1-2 h, The ubiquitin/26S proteasome pathway has been implicated in phyA breakdown, In this proteolytic pathway, multiple ubiquitins are covalently attached to proteins committed for degradation; these ubiquitin-protein conjugates then serve as intermediates in the breakdown of the target protein by the 26S proteasome, a multi-subunit proteolytic complex. In several plant species, ubiquitin-phyA conjugates have been detected in vivo following Pfr formation that show accumulation and decay kinetics expected for Pfr degradation intermediates, Analyses of phyA mutants and phyA/phyB chimeras expressed in transgenic plants have been particularly useful in mapping domains within the chromoprotein that are necessary for Pfr degradation, Several domains have been identified within both the N- and C-terminal portions of the photoreceptor that presumably serve as recognition and/or acceptor sites for ubiquitination.
Keyword:
phytochrome A
protein degradation
transgenic plants
ubiquitin
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6.3
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6.6K
被引数:
3.2W
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