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MetaCyc Pathway: chlorophyll a biosynthesis II
Inferred from experiment

Pathway diagram: chlorophyll a biosynthesis II

This view shows enzymes only for those organisms listed below, in the list of taxa known to possess the pathway. If an enzyme name is shown in bold, there is experimental evidence for this enzymatic activity.

Superclasses: BiosynthesisCofactors, Prosthetic Groups, Electron Carriers BiosynthesisPorphyrin Compounds BiosynthesisChlorophyll BiosynthesisChlorophyll a Biosynthesis

Some taxa known to possess this pathway include : Arabidopsis thaliana col

Expected Taxonomic Range: Viridiplantae

General Background

Chlorophyll is a green photosynthetic pigment found in photosynthetic plants, algae, and bacteria. Its name is derived from ancient Greek: chloros = green and phyllon = leaf. Chlorophyll functions as the main light harvesting pigment in photosynthesis, capturing photons and transfering them to the reaction centers. Chlorophyll absorbs mostly in the blue and, to a lesser extent, red portions of the electromagnetic spectrum, hence its intense green color. There are several variants of chlorophyll ( chlorophyll a, chlorophyll a', chlorophyll b, chlorophyll c1, chlorophyll c2, and chlorophyll d).

About This Pathway

chlorophyll a (Chla) and chlorophyll b (Chlb) share the same structure except for the side chain at C-7 which is a methyl group in Chla and a formyl group in Chlb. This pathway describes the biosynthesis of Chla via the esterification of chlorophyllide a with geranylgeranyl diphosphate diphosphate. The esterification step is followed by several steps of reduction leading to the formation of chlorophyll a [Keller98].

Variants: chlorophyll a biosynthesis I, chlorophyll cycle, superpathway of bacteriochlorophyll a biosynthesis

Unification Links: AraCyc:PWY-5064


Keller98: Keller Y, Bouvier F, d'Harlingue A, Camara B (1998). "Metabolic compartmentation of plastid prenyllipid biosynthesis--evidence for the involvement of a multifunctional geranylgeranyl reductase." Eur J Biochem 251(1-2);413-7. PMID: 9492312

Other References Related to Enzymes, Genes, Subpathways, and Substrates of this Pathway

Gaubier95: Gaubier P, Wu HJ, Laudie M, Delseny M, Grellet F (1995). "A chlorophyll synthetase gene from Arabidopsis thaliana." Mol Gen Genet 249(1);58-64. PMID: 8552034

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

Oster97: Oster U., Rudiger W. (1997). "The G4 gene of Arabidopsis thaliana encodes a chlorophyll synthase of etiolated plants." Bot. Acta 110 : 420-423.

Report Errors or Provide Feedback
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 Pathway Tools version 19.5 (software by SRI International) on Sat Feb 6, 2016, biocyc13.