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EC 3.1.1.82 Details
EC number
3.1.1.82
Accepted name
pheophorbidase
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)
Other name(s)
phedase, PPD
Systematic name
pheophorbide-a hydrolase
Comment
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 [2]. Another enzyme, called pheophorbide demethoxycarbonylase (PDC), produces pyropheophorbide a from pheophorbide a without forming an intermediate although the precise reaction is not yet known [1].
History
created 2007
EC Tree
1.3.99.9 created 1976, deleted 2002