PROSITE documentation PDOC00218Phytochrome chromophore attachment site
Phytochrome [1,2,3] is a plant protein that acts as a regulatory photoreceptor and which mediates red-light effects on a wide variety of physiological and molecular responses. Phytochrome can undergo a reversible photochemical conversion between a biologically inactive red light-absorbing form and the active far-red light-absorbing form. Phytochrome is a dimer of identical 124 Kd subunits, each of which contains a covalently attached linear tetrapyrrole chromophore.
The chromophore is attached to a cysteine which is located in a highly conserved region that can be used as a signature pattern.
Synechocystis strain PCC 6803 hypothetical protein slr0473 contains a domain similar to that of plants phytochrome and seems to also bind a chromophore.
Expert(s) to contact by email: Last update:November 1997 / Pattern and text revised; profile.
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PROSITE methods (with tools and information) covered by this documentation:
| 1 | Authors | Silverthorne J. Tobin E.M. |
| Source | BioEssays 7:18-23(1987). |
| 2 | Authors | Quail P.H. |
| Title | Phytochrome: a light-activated molecular switch that regulates plant gene expression. | |
| Source | Annu. Rev. Genet. 25:389-409(1991). | |
| PubMed ID | 1812812 | |
| DOI | 10.1146/annurev.ge.25.120191.002133 |
| 3 | Authors | Quail P.H. |
| Title | The phytochromes: a biochemical mechanism of signaling in sight? | |
| Source | BioEssays 19:571-579(1997). | |
| PubMed ID | 9230690 |
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