In the light, cry1 is activated directly by blue light and indirectly by blue lightinduced phosphorylation. Activated cry1 forms a complex with COP1 and SPA1 via the C-terminal domain, preventing them from degrading protein targets such as HY5

TLS Online TPP Program

#Id: 9833

#XL - R Botany

PIFs promote etiolated development in the dark (skotomorphogenesis) primarily by serving as transcriptional activators of dark induced genes

TLS Online TPP Program

#Id: 9834

#XL - R Botany

Red light-induced Pfr formation initiates the degradation of PIF proteins through phosphorylation, followed by degradation via the proteasome complex

TLS Online TPP Program

#Id: 9835

#XL - R Botany

TLS Online TPP Program

#Id: 9836

#XL - R Botany

CONSTITUTIVE PHOTOMORPHOGENESIS1 (COP1), another negative regulator of photomorphogenesis, is a component of the E3 ubiquitin ligase complex that targets photomorphogenesis-promoting proteins for degradation such as phyA, phyB.

TLS Online TPP Program

#Id: 9837

#XL - R Botany

COP1 is found in the nucleus in the dark and in the cytoplasm in the light. COP1 movement into the nucleus in the dark requires the COP9 signalosome (CSN) complex

TLS Online TPP Program

#Id: 9838

#XL - R Botany

In the dark, COP1, an E3 ligase, ubiquitinates HY5.