Cph1, cyanobacterial phytochrome 1 from Synechocystis sp. PAS is the acronym from the founding members of this protein domain ( Per/ Arndt/ Sim). B, structural domains of prokaryotic and plant phytochromes. The absorption spectra of Pr and Pfr are indicated. ![]() ![]() Absorption of red light triggers a “Z” to “E” isomerization in the C-15 double bond between the C and D rings (indicated in bold). The arrow indicates the site of chromophore attachment to a cysteine in the bilin lyase domain. Note that chromophore binding is autocatalytic it requires the bilin lyase domain of the phytochrome phytochromes also possess PφB isomerase activity. ![]() Enzymes are indicated in red, and the Arabidopsis genes are indicated. A, biosynthetic pathway of the phytochrome chromophore. Glycobiology and Extracellular Matricesįigure 1 Structural domains and spectral properties of phytochromes.
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