|Superclasses:||Reactions Classified By Conversion Type → Simple Reactions → Chemical Reactions|
|Reactions Classified By Substrate → Small-Molecule Reactions|
In Pathway: chlorophyll a degradation II
The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the direction in which it was curated.
Most BioCyc compounds have been protonated to a reference pH value of 7.3, and some reactions have been computationally balanced for hydrogen by adding free protons. Please see the PGDB Concepts Guide for more information.
Mass balance status: Balanced.
Standard Gibbs Free Energy (ΔrG'° in kcal/mol): -10.110001 [Latendresse13]
Dechelation of Mg2+ in chlorophyll a to form pheophytin a has been observed in parsley leaves [AmirShapira87], olives [MinguezMosquera94], and cabbage in coleslaw [Heaton96]. Dephytolization to form pheophorbide a was observed in coleslaw cabbage, but not in olives or parsley.
Unification Links: KEGG:R08584
AmirShapira87: Amir-Shapira D, Goldschmidt EE, Altman A (1987). "Chlorophyll catabolism in senescing plant tissues: In vivo breakdown intermediates suggest different degradative pathways for Citrus fruit and parsley leaves." Proc Natl Acad Sci U S A 84(7);1901-1905. PMID: 16593821
MinguezMosquera94: Minguez-Mosquera MI, Grandul-Rojas BG, Minguez-Mosquera J (1994). "Mechanism and kinetics of the degradation of chlorophylls during the processing of green table olives." Journal of Agricultural and Food Chemistry 42:1089-1095.
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