Pheophorbidase

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Pheophorbidase
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EC no. 3.1.1.82
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Pheophorbidase (EC 3.1.1.82, phedase, PPD) is an enzyme with systematic name pheophorbide-a hydrolase. [1] [2] [3] It catalyses the following reaction:

pheophorbide a + H2O pyropheophorbide a + methanol + CO2 (overall reaction)
(1a) pheophorbide a + H2O C-132-carboxypyropheophorbide a + methanol
(1b) C-132-carboxypyropheophorbide a pyropheophorbide a + CO2 (spontaneous)

This enzyme participates in the chlorophyll degradation in higher plants and algae.

Related Research Articles

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<span class="mw-page-title-main">Chlorophyllide-a oxygenase</span> Class of enzymes

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Chlorophyllide a and Chlorophyllide b are the biosynthetic precursors of chlorophyll a and chlorophyll b respectively. Their propionic acid groups are converted to phytyl esters by the enzyme chlorophyll synthase in the final step of the pathway. Thus the main interest in these chemical compounds has been in the study of chlorophyll biosynthesis in plants, algae and cyanobacteria. Chlorophyllide a is also an intermediate in the biosynthesis of bacteriochlorophylls.

References

  1. ↑ Suzuki Y, Doi M, Shioi Y (2002). "Two enzymatic reaction pathways in the formation of pyropheophorbide a". Photosynthesis Research. 74 (2): 225–33. doi:10.1023/A:1020919929608. PMID   16228561.
  2. ↑ Suzuki Y, Amano T, Shioi Y (February 2006). "Characterization and cloning of the chlorophyll-degrading enzyme pheophorbidase from cotyledons of radish". Plant Physiology. 140 (2): 716–25. doi:10.1104/pp.105.071290. PMC   1361337 . PMID   16384908.
  3. ↑ Hörtensteiner S (2006). "Chlorophyll degradation during senescence". Annual Review of Plant Biology. 57: 55–77. doi:10.1146/annurev.arplant.57.032905.105212. PMID   16669755.
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