MetaCyc Reaction: [no EC number assigned]

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 Inferred by computational analysis [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

Heaton96: Heaton JW, Yada RY, Marangoni AG (1996). "Discoloration of coleslaw is caused by chlorophyll degradation." Journal of Agricultural and Food Chemistry 44:395-398.

Latendresse13: Latendresse M. (2013). "Computing Gibbs Free Energy of Compounds and Reactions in MetaCyc."

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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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
Page generated by SRI International Pathway Tools version 19.0 on Tue Oct 6, 2015, biocyc13.