GPK enzyme activity is increased either by phosphorylation of these two regulatory subunits by PKA or by Ca+2 binding to the calmodulin subunit; maximal activity requires both.

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.

TLS Online TPP Program

#Id: 9839

#XL - R Botany

TLS Online TPP Program

#Id: 9840

#XL - R Botany

Plant phytochrome is an autophosphorylating

serine/threonine kinase that may phosphorylate

other proteins

TLS Online TPP Program

#Id: 9841

#XL - R Botany

Three distinct classes of photoreceptors mediate the effects of UV-A/blue light (320–500 nm): the cryptochromes, phototropins and the ZEITLUPE (ZTL) family of proteins

TLS Online TPP Program

#Id: 9842

#XL - R Botany

Cryptochromes under blue light causes

1.Suppression of hypocotyl elongation

2.Promotion of cotyledon expansion

3.Membrane depolarization

4.Inhibition of petiole elongation

5.Anthocyanin production

6.Circadian clock entrainment