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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
3.1.1.9 created 1961, deleted 1972
3.1.1.12 created 1961, deleted 1972
3.1.1.16 created 1961, deleted 1972
3.1.1.18 created 1961, deleted 1982
3.1.1.62 created 1989, deleted 1992
3.1.1.69 created 1992, deleted 2002
3.6.1.4 created 1961, deleted 1965
3.6.1.32 created 1984, deleted 2000
3.6.1.33 created 1984, deleted 2000
3.6.1.34 created 1984, deleted 2000
3.6.1.35 created 1984, deleted 2000
3.6.1.36 created 1984, deleted 2000
3.6.1.37 created 1984, deleted 2000
3.6.1.38 created 1984, deleted 2000
3.6.1.46 created 2000, deleted 2003
3.6.1.47 created 2000, deleted 2003
3.6.1.48 created 2000, deleted 200
3.6.1.49 created 2000, deleted 2003
3.6.1.50 created 2000, deleted 2003
3.6.1.51 created 2000, deleted 2003