Pheophytins

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Structure of phaeophytin a . Apart from the missing magnesium ion, the structure corresponds to that of chlorophyll a .

As pheophytins (also phaeophytins or Pheophytine) refers to chlorophyll molecules in which the central magnesium ion is absent. The corresponding bacteriochlorophylls without magnesium ion are accordingly called bacteriophaeophytins . Phäophytins (or bacteriophäophytins) are abbreviated differently in the literature, either as "Phe (o)" (or "BPhe (o)") or with the Greek letter Phi ("Φ").

Pheophytins play an important role in photosynthesis . They are responsible for the transfer of electrons in the reaction center of photosystem II (PS-II). Bacteriophäophytins are also involved as electron donors in anoxygenic photosynthesis in green non-sulfur bacteria and purple bacteria . Thus Rhodobacter sphaeroides , a purple bacterium, has two bacteriophaeophytins a in its reaction center .

The word component Phäo- is derived from the Greek φαιός phaiós : "dark".

presentation

Pheophorbide a , a breakdown product of phaeophytin a .

Pheophytins can be produced from chlorophylls by exposure to weak acids.

If the phytol part is split off from pheophytin a , a so-called pheophorbide is obtained .

Individual evidence

  1. ↑ Jeremy M. Berg, Lubert Stryer, John L. Tymoczko: Biochemistry. 6th edition. Spektrum Akademischer Verlag, 2007, ISBN 978-3-8274-1800-5 , p. 612.
  2. ↑ a b c Hans W. Heldt, Birgit Piechulla: Plant biochemistry . 4th edition. Spektrum Akademischer Verlag, 2008, ISBN 978-3-8274-1961-3 , p. 72.
  3. ↑ Georg Fuchs (ed.); Hans. G. Schlegel: General Microbiology . 8th edition. Thieme Verlag, Stuttgart 2007, ISBN 978-3-13-444608-1 , p. 427.
  4. ^ A b Andreas Bresinsky, Christian Körner, Joachim W. Kadereit, G. Neuhaus, Uwe Sonnewald: Strasburger - Textbook of Botany. 36th edition. Spektrum Akademischer Verlag, Heidelberg 2008, ISBN 978-3-8274-1455-7 , p. 315, p. 277.