EC Number   |
General Information |
Reference |
|---|
    1.1.1.294 | evolution |
chlorophyll b reductase belongs to the short-chain dehydrogenase superfamily |
714334 |
| 1.1.1.294 | evolution |
LpNYC1 shares the highest amino acid sequence similarity with BdNYC1 (91.5%) in Brachypodium distachyon, and the lowest with Arabidopsis NYC1 (63.6%). Despite the sequence divergence, the NYC1 orthologues all share the classical chloroplast-localized short-chain dehydrogenase/reductase (SDR) domain with the TGXXGXXG cofactor binding motif and the YXXXK active site for catabolizing Chl b into 7-hydroxymethyl-chl a |
762974 |
| 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 |
714334 |
| 1.1.1.294 | malfunction |
germination rates of mutants rapidly decrease during storage, the non-yellow coloring1 (nyc1)/nyc1-like (nol) mutant seeds fail to germinate after storage for 23 months, whereas 75% of the wild-type seeds germinate after 42 months. Mutations in the chlorophyll degradation enzymes, e.g. in chlorophyll b reductase, result in the stay-green phenotype in leaves, only a nyc1 mutation was accompanied by a stay-green phenotype in Arabidopsis thaliana. Lack of chlorophyll b reductase results in the retention of LHC proteins as well as both chlorophyll a and b that are associated with LHC proteins in leaves. Large amount of LHCII apoproteins accumulated in the nyc1 and nyc1/nol mutants |
726228 |
| 1.1.1.294 | malfunction |
in broccoli, treatments with UV-C can delay Chl degradation, diminish respiration rates and reduce the loss of sugars and proteins during postharvest storage |
763632 |
| 1.1.1.294 | malfunction |
knocking out the Chl b reductase gene might lead to a stay-green phenotype. Overexpression of LpNYC1 activates leaf senescence in Nicotiana benthamiana and rescues the stay-green trait in the Arabidopsis thaliana nyc1 null mutant |
762974 |
| 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 |
714334 |
| 1.1.1.294 | metabolism |
during senescence, chlorophylls are degraded with the purpose of avoiding presence of photoactive molecules. Chlorophyll b must be previously converted to chlorophyll a in order to be catabolized. This reduction process is catalyzed by two enzymes, chlorophyll b reductase (CBR) and hydroxymethyl chlorophyll a reductase (HCAR) |
763632 |
| 1.1.1.294 | metabolism |
the enzyme is part of the chlorophyll metabolism pathway, overview. Chlorophyll b reductase catalyzes the conversion of chlorophyll b to 7-hydroxymethyl chlorophyll a, which is the first step in chlorophyll b degradation |
726228 |
| 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 |
714334 |
