Discussion
Which of the following statements about phytochrome is NOT CORRECT ?
Answer: D
The statement that is not correct is Phytochrome are normally found in the chloroplast.
Phytochrome is a soluble protein made in the cytosol. In its inactive red-absorbing form (Pr) it stays in the cytoplasm; on conversion to the far-red absorbing Pfr form it moves into the nucleus, where it regulates gene expression. It is not a chloroplast protein.
The other statements are correct. The N-terminal photosensory region contains PAS, GAF and PHY domains (the chromophore binds in GAF), and the C-terminal region carries PAS-related (PRD) repeats and a histidine-kinase-related domain. Phytochrome has light-regulated serine/threonine kinase activity. In Arabidopsis it is encoded by a multigene family of five genes, PHYA to PHYE.
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