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Information on EC - pheophorbidase

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EC Tree
     3 Hydrolases
         3.1 Acting on ester bonds
             3.1.1 Carboxylic-ester hydrolases
IUBMB Comments
This enzyme forms part of the chlorophyll degradation pathway, and is found in higher plants and in algae. In higher plants it participates in de-greening processes such as fruit ripening, leaf senescence, and flowering. The enzyme exists in two forms: type 1 is induced by senescence whereas type 2 is constitutively expressed [1,2]. The enzyme is highly specific for pheophorbide as substrate (with a preference for pheophorbide a over pheophorbide b) as other chlorophyll derivatives such as protochlorophyllide a, pheophytin a and c, chlorophyll a and b, and chlorophyllide a cannot act as substrates . Another enzyme, called pheophorbide demethoxycarbonylase (PDC), produces pyropheophorbide a from pheophorbide a without forming an intermediate although the precise reaction is not yet known .
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Word Map
The expected taxonomic range for this enzyme is: Bacteria, Eukaryota
mes16, phedase, pheophorbidase, more
C-132-carboxypyropheophorbide a = pyropheophorbide a + CO2
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pheophorbide a + H2O = C-132-carboxypyropheophorbide a + methanol
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pheophorbide a + H2O = pyropheophorbide a + methanol + CO2
show the reaction diagram
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