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Your query returned 1 entry. Printable version
EC | 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) |
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For diagram of chlorophyll catabolism, click here | |||||||
Other name(s): | phedase; PPD | ||||||
Systematic name: | pheophorbide-a hydrolase | ||||||
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 [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]. | ||||||
Links to other databases: | BRENDA, EXPASY, KEGG, MetaCyc, PDB | ||||||
References: |
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