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Your query returned 4 entries. Printable version
EC | 1.3.1.80 | ||||||||||||
Transferred entry: | red chlorophyll catabolite reductase. Now classified as EC 1.3.7.12, red chlorophyll catabolite reductase | ||||||||||||
EC | 1.3.7.12 | ||||||||||||
Accepted name: | red chlorophyll catabolite reductase | ||||||||||||
Reaction: | primary fluorescent chlorophyll catabolite + 2 oxidized ferredoxin [iron-sulfur] cluster = red chlorophyll catabolite + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ | ||||||||||||
For diagram of chlorophyll catabolism, click here | |||||||||||||
Glossary: | red chlorophyll catabolite = RCC = (7S,8S,101R)-8-(2-carboxyethyl)-17-ethyl-19-formyl-101-(methoxycarbonyl)-3,7,13,18-tetramethyl-2-vinyl-8,23-dihydro-7H-10,12-ethanobiladiene-ab-1,102(21H)-dione primary fluorescent chlorophyll catabolite = pFCC = (82R,12S,13S)-12-(2-carboxyethyl)-3-ethyl-1-formyl-82-(methoxycarbonyl)-2,7,13,17-tetramethyl-18-vinyl-12,13-dihydro-8,10-ethanobilene-b-81,19(16H)-dione |
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Other name(s): | RCCR; RCC reductase; red Chl catabolite reductase | ||||||||||||
Systematic name: | primary fluorescent chlorophyll catabolite:ferredoxin oxidoreductase | ||||||||||||
Comments: | The enzyme participates in chlorophyll degradation, which occurs during leaf senescence and fruit ripening in higher plants. The reaction requires reduced ferredoxin, which is generated from NADPH produced either through the pentose-phosphate pathway or by the action of photosystem I [1,2]. This reaction takes place while red chlorophyll catabolite is still bound to EC 1.14.15.17, pheophorbide a oxygenase [3]. Depending on the plant species used as the source of enzyme, one of two possible C-1 epimers of primary fluorescent chlorophyll catabolite (pFCC), pFCC-1 or pFCC-2, is normally formed, with all genera or species within a family producing the same isomer [3,4]. After modification and export, pFCCs are eventually imported into the vacuole, where the acidic environment causes their non-enzymic conversion into colourless breakdown products called non-fluorescent chlorophyll catabolites (NCCs) [2]. | ||||||||||||
Links to other databases: | BRENDA, EXPASY, KEGG, MetaCyc, PDB | ||||||||||||
References: |
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EC | 1.14.12.20 | ||||||||||||
Transferred entry: | pheophorbide a oxygenase. Now classified as EC 1.14.15.17, pheophorbide a oxygenase. | ||||||||||||
EC | 1.14.15.17 | ||||||||||||
Accepted name: | pheophorbide a oxygenase | ||||||||||||
Reaction: | pheophorbide a + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ + O2 = red chlorophyll catabolite + 2 oxidized ferredoxin [iron-sulfur] cluster (overall reaction) (1a) pheophorbide a + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ + O2 = epoxypheophorbide a + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O (1b) epoxypheophorbide a + H2O = red chlorophyll catabolite (spontaneous) |
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For diagram of chlorophyll catabolism, click here | |||||||||||||
Glossary: | red chlorophyll catabolite = RCC = (7S,8S,101R)-8-(2-carboxyethyl)-8,23-dihydro-17-ethyl-19-formyl-101-(methoxycarbonyl)-3,7,13,18-tetramethyl-2-vinyl-7H-10,12-ethanobiladiene-ab-1,102(21H)-dione | ||||||||||||
Other name(s): | pheide a monooxygenase; pheide a oxygenase; PaO; PAO | ||||||||||||
Systematic name: | pheophorbide-a,ferredoxin:oxygen oxidoreductase (biladiene-forming) | ||||||||||||
Comments: | This enzyme catalyses a key reaction in chlorophyll degradation, which occurs during leaf senescence and fruit ripening in higher plants. The enzyme from Arabidopsis contains a Rieske-type iron-sulfur cluster [2] and requires reduced ferredoxin, which is generated either by NADPH through the pentose-phosphate pathway or by the action of photosystem I [4]. While still attached to this enzyme, the product is rapidly converted into primary fluorescent chlorophyll catabolite by the action of EC 1.3.7.12, red chlorophyll catabolite reductase [2,6]. Pheophorbide b acts as an inhibitor. In 18O2 labelling experiments, only the aldehyde oxygen is labelled, suggesting that the other oxygen atom may originate from H2O [1]. | ||||||||||||
Links to other databases: | BRENDA, EXPASY, KEGG, MetaCyc | ||||||||||||
References: |
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