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Information on EC 3.1.1.82 - pheophorbidase

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EC Tree
     3 Hydrolases
         3.1 Acting on ester bonds
             3.1.1 Carboxylic-ester hydrolases
                3.1.1.82 pheophorbidase
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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The expected taxonomic range for this enzyme is: Bacteria, Eukaryota
Synonyms
mes16, phedase, pheophorbidase, more
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
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
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