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Literature summary extracted from

  • Tanaka, R.; Tanaka, A.
    Chlorophyll cycle regulates the construction and destruction of the light-harvesting complexes (2011), Biochim. Biophys. Acta, 1807, 968-976.
    View publication on PubMed

Localization

EC Number Localization Comment Organism GeneOntology No. Textmining
1.1.1.294 membrane NYC1 isoform has three putative membrane-spanning domains, while NOL does not contain any predictable membrane-spanning domains Hordeum vulgare 16020
-
1.1.1.294 membrane NYC1 isoform has three putative membrane-spanning domains, while NOL does not contain any predictable membrane-spanning domains Arabidopsis thaliana 16020
-
1.1.1.294 membrane NYC1 isoform has three putative membrane-spanning domains, while NOL does not contain any predictable membrane-spanning domains Oryza sativa 16020
-

Natural Substrates/ Products (Substrates)

EC Number Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
1.1.1.294 chlorophyllide b + NADPH + H+ Hordeum vulgare
-
 7-hydroxychlorophyllide a + NADP+
-
 ?
1.1.1.294 chlorophyllide b + NADPH + H+ Arabidopsis thaliana
-
 7-hydroxychlorophyllide a + NADP+
-
 ?
1.1.1.294 chlorophyllide b + NADPH + H+ Oryza sativa
-
 7-hydroxychlorophyllide a + NADP+
-
 ?
1.17.7.2 7-hydroxymethyl-chlorophyll a + reduced ferredoxin + H+ Arabidopsis thaliana
-
 chlorophyll a + oxidized ferredoxin + H2O
-
 ir

Organism

EC Number Organism UniProt Comment Textmining
1.1.1.294 Arabidopsis thaliana
-
 two isoforms of chlorophyll b reductase termed NYC1 and NOL, respectively
-
1.1.1.294 Hordeum vulgare
-
 two isoforms of chlorophyll b reductase termed NYC1 and NOL, respectively
-
1.1.1.294 Oryza sativa
-
 two isoforms of chlorophyll b reductase termed NYC1 and NOL, respectively
-
1.17.7.2 Arabidopsis thaliana
-
-
-

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
1.1.1.294 chlorophyllide b + NADPH + H+
-
 Hordeum vulgare 7-hydroxychlorophyllide a + NADP+
-
 ?
1.1.1.294 chlorophyllide b + NADPH + H+
-
 Arabidopsis thaliana 7-hydroxychlorophyllide a + NADP+
-
 ?
1.1.1.294 chlorophyllide b + NADPH + H+
-
 Oryza sativa 7-hydroxychlorophyllide a + NADP+
-
 ?
1.17.7.2 7-hydroxymethyl-chlorophyll a + reduced ferredoxin + H+
-
 Arabidopsis thaliana chlorophyll a + oxidized ferredoxin + H2O
-
 ir

Synonyms

EC Number Synonyms Comment Organism
1.1.1.294 chlorophyll b reductase
-
 Hordeum vulgare
1.1.1.294 chlorophyll b reductase
-
 Arabidopsis thaliana
1.1.1.294 chlorophyll b reductase
-
 Oryza sativa
1.17.7.2 HCAR
-
 Arabidopsis thaliana
1.17.7.2 HMChl reductase
-
 Arabidopsis thaliana

Cofactor

EC Number Cofactor Comment Organism Structure
1.1.1.294 NADPH
-
 Hordeum vulgare
1.1.1.294 NADPH
-
 Arabidopsis thaliana
1.1.1.294 NADPH
-
 Oryza sativa

Expression

EC Number Organism Comment Expression
1.17.7.2 Arabidopsis thaliana the enzyme activity is induced upon senescence up

General Information

EC Number General Information Comment Organism
1.1.1.294 evolution chlorophyll b reductase belongs to the short-chain dehydrogenase superfamily Hordeum vulgare
1.1.1.294 evolution chlorophyll b reductase belongs to the short-chain dehydrogenase superfamily Arabidopsis thaliana
1.1.1.294 evolution chlorophyll b reductase belongs to the short-chain dehydrogenase superfamily Oryza sativa
1.1.1.294 malfunction Arabidosis thaliana mutants lacking either NYC1 or NOL are deficient in chlorophyll b reductase activity during leaf senescence. Impairment in the chlorophyll b reduction leads to LHC stabilization during leaf senescence in the rice mutant lacking chlorophyll b reductase Arabidopsis thaliana
1.1.1.294 malfunction rice mutants lacking either NYC1 or NOL are deficient in chlorophyll b reductase activity during leaf senescence. Impairment in the chlorophyll b reduction leads to LHC stabilization during leaf senescence in the rice mutant lacking chlorophyll b reductase Oryza sativa
1.1.1.294 metabolism three enzymes participating in the chlorophyll cycle, namely, chlorophyllide a oxygenase, chlorophyll b reductase, and 7-hydroxymethylchlorophyll reductase, overview. In the reverse reactions from chlorophyll b to chlorophyll a, the 7-formyl group of chlorophyll b is first reduced to a hydroxyl group by the action of chlorophyll b reductase. The activities of chlorophyll b reductase and7-hydroxymethylchlorophyll reductase are coordinated in their regulation, otherwise, imbalance of those activities may lead to accumulation of the intermediate of the pathway. The conversion of chlorophyll b into chlorophyll a precedes the degradation of LHC during leaf senescence Hordeum vulgare
1.1.1.294 metabolism three enzymes participating in the chlorophyll cycle, namely, chlorophyllide a oxygenase, chlorophyll b reductase, and 7-hydroxymethylchlorophyll reductase, overview. In the reverse reactions from chlorophyll b to chlorophyll a, the 7-formyl group of chlorophyll b is first reduced to a hydroxyl group by the action of chlorophyll b reductase. The activities of chlorophyll b reductase and7-hydroxymethylchlorophyll reductase are coordinated in their regulation, otherwise, imbalance of those activities may lead to accumulation of the intermediate of the pathway. The conversion of chlorophyll b into chlorophyll a precedes the degradation of LHC during leaf senescence Arabidopsis thaliana
1.1.1.294 metabolism three enzymes participating in the chlorophyll cycle, namely, chlorophyllide a oxygenase, chlorophyll b reductase, and 7-hydroxymethylchlorophyll reductase, overview. In the reverse reactions from chlorophyll b to chlorophyll a, the 7-formyl group of chlorophyll b is first reduced to a hydroxyl group by the action of chlorophyll b reductase. The activities of chlorophyll b reductase and7-hydroxymethylchlorophyll reductase are coordinated in their regulation, otherwise, imbalance of those activities may lead to accumulation of the intermediate of the pathway. The conversion of chlorophyll b into chlorophyll a precedes the degradation of LHC during leaf senescence Oryza sativa
1.1.1.294 additional information rice mutants lacking either NYC1 or NOL are deficient in chlorophyll b reductase activity during leaf senescence. Recombinant NOL enzyme shows in vitro chlorophyll b reductase activity in the absence of NYC1, it is possible that NOL could function independently of NYC1. It is possible that the heterodimer formation of NYC1 and NOL is necessary only under specific developmental conditions such as leaf senescence Oryza sativa
1.1.1.294 physiological function when greening seedlings are transferred back to darkness, conversion of chlorophyll b to chlorophyll a occurs, which results in degradation of LHC and an increase in the core antenna complexes Hordeum vulgare