Talk:Phytochrome
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The notations Pr and Pfr were recently changed to Pr and Pfr. Is that standard? In published papers, I keep seeing the non-subscripted version: [1], [2]. Cheers, AxelBoldt 15:07, 8 May 2006 (UTC)
You're right. The non-supscripted versions are standard. Also, the P in Pr / Pfr stands for "pigment" not "phytochrome" - I changed that (but left subscripts for now).
Indeed, subscripting is not mandatory. I removed the archaeic structure illustration of phytochromobilin and the poor diagram showing the UV-Vis absorbance spectra of Pr and "Pfr" (which was the spectrum of a Pr / Pfr mixture). Also I have changed "form" and "isoform" to "state" (thus "ground state", "signalling state") which is more in line with current useage in photobiology and photochemistry.
130.15.30.116 (talk) 14:49, 12 May 2008 (UTC) Some problems: This article does not use properly embedded references, can this be fixed? Also, the "Isoforms or states" section appears to be referencing a non-existent chart or figure in the text (refers to "left" and "right").
[edit] Phytochromobiline structure
The images appear to be at a early level of phytochrom research - indeed the conformations of the pigment during photoisomerization are more or less known. There appears to be a rotation of the D-ring of the tetrapyrrole, a E/Z-isomerisation at the C15-C16 double bond. There have been experiments with synthetic sterically locked pigments to characterise their conformational states. Pfr structure is still partly hypothetical though. Look for the Review Articles by Rockwell in Annu. Rev. of Plant Biol of 2006 and 2008.I uploaded updated images to german wikipedia, maybe you want to use these. --85.178.47.222 (talk) 12:34, 28 May 2008 (UTC)
