Pheophytin is a waste product that is used by plants to r...
“Pheophytin is a waste product that is used by plants to recycle magnesium ions, however it cannot convert back into chlorophyll once the magnesium ion is removed.”
Summary
Pheophytin is formed when magnesium is removed from chlorophyll during the normal degradation of the pigment; it is an intermediate, not a waste product, and the released magnesium can be reused elsewhere in the plant. However, once magnesium is removed, pheophytin does not spontaneously revert to chlorophyll; regeneration requires the full chlorophyll biosynthetic pathway.
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- Pheophytin - an overview | ScienceDirect Topics
Chromatographic evidence for the formation of isomers of the common pheophytins a, b, and d has been obtained (99, 100). These acidic compounds are produced by the removal of magnesium from the chlorophyllides formed in plants by enzymatic hydrolysis of the phytyl group from the chlorophyll.
- Pheophytin - an overview | ScienceDirect Topics
Chlorophyll is a complex molecule and can participate in several reactions. The magnesium of chlorophyll is easily replaced by two hydrogen atoms in the presence of mild acids such as oxalic or acetic to produce a compound called pheophytin. Pheophytin a is a grayish green and pheophytin b ...
- Pheophytins as bioenhancers: Improving cannabidiol bioavailability and efficacy in cannabis extracts - ScienceDirect
Notably, studies have shown that chlorophyll and pheophytin molecules can form spherical aggregates in aqueous solutions, with hydrophobic tails sequestered in the core and hydrophilic heads facing outward (Agostiano et al., 2002, Chin et al., ...
- Pheophytin pheophorbide hydrolase (pheophytinase) is involved in chlorophyll breakdown during leaf senescence in Arabidopsis - PubMed
However, chlorophyllase, which converts chlorophyll to chlorophyllide, was found not to be essential for dephytylation in Arabidopsis thaliana. Here, we identify pheophytinase (PPH), a chloroplast-located and senescence-induced hydrolase widely distributed in algae and land plants.
- Pheophytin a and chlorophyll a suppress ...
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- Catalytic and structural properties of pheophytinase, the phytol esterase involved in chlorophyll breakdown - PubMed
A key feature of chlorophyll breakdown is the removal of the hydrophobic phytol chain that renders phyllobilins water soluble, an important prerequisite for their ultimate storage in the vacuole of senescent cells. Chlorophyllases had been considered for more than a century to catalyze dephytylation in vivo; however, this was recently refuted. Instead, pheophytinase was discovered as a genuine in vivo phytol hydrolase.
- Arabidopsis STAY-GREEN, Mendel’s Green Cotyledon Gene, Encodes Magnesium-Dechelatase - PMC
In addition, conversion of chlorophyll a to pheophytin a is the first step of chlorophyll degradation. Pheophytin is synthesized by extracting magnesium (Mg) from chlorophyll; the enzyme Mg-dechelatase catalyzes this reaction. In this study, we report that Mendel’s green cotyledon gene, ...
- Pheophytin Pheophorbide Hydrolase (Pheophytinase ... - PMC
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