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2015 ; 13
(ä): 45
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Q&A: How do plants sense and respond to UV-B radiation?
#MMPMID26123292
Ulm R
; Jenkins GI
BMC Biol
2015[Jun]; 13
(ä): 45
PMID26123292
show ga
Plants are able to sense UV-B through the UV-B photoreceptor UVR8. UV-B photon
absorption by a UVR8 homodimer leads to UVR8 monomerization and interaction with
the downstream signaling factor COP1. This then initiates changes in gene
expression, which lead to several metabolic and morphological alterations. A
major response is the activation of mechanisms associated with UV-B acclimation
and UV-B tolerance, including biosynthesis of sunscreen metabolites, antioxidants
and DNA repair enzymes. To balance the response, UVR8 is inactivated by regulated
re-dimerization. Apart from their importance for plants, UVR8 and its interacting
protein COP1 have already proved useful for the optogenetic toolkit used to
engineer synthetic light-dependent responses.