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pheophytin
Pheophytin or phaeophytin (abbreviated Pheo) is a chemical compound that serves as the first electron carrier intermediate in the electron transfer pathway of photosystem II (PS II) in plants, and the photosynthetic reaction center (RC P870) found in purple bacteria. In both PS II and RC P870, light drives electrons from the reaction center through pheophytin, which then passes the electrons to a quinone (QA) in RC P870 and RC P680. The overall mechanisms, roles, and purposes of the pheophytin molecules in the two transport chains are analogous to each other.
==Structure==
In biochemical terms, pheophytin is a chlorophyll molecule lacking a central Mg2+ ion. It can be produced from chlorophyll by treatment with a weak acid, producing a dark bluish waxy pigment.〔http://dictionary.reference.com/browse/pheophytin Merriam-Webster Medical Dictionary definition of Pheophytin 〕 The probable etymology comes from this description, with ''pheo'' meaning ''dusky''〔http://dictionary.reference.com/browse/pheo- Definition of pheo in The American Heritage Stedman's Medical Dictionary〕 and ''phyt'' meaning ''vegetation''.〔(phyt ). CollinsDictionary.com. Collins English Dictionary - Complete & Unabridged 11th Edition. Retrieved October 19, 2012.〕
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