Abstract
Mg-protoporphyrin (Mg-Proto) (Fig. 7.1) is the immediate precursor of Mg-proto monomethyl ester (Mpe). The proposed role of Mg-Proto as an intermediate in the Chl biosynthetic pathway was based on the detection of Mg-Proto in X-ray Chlorella mutants inhibited in their capacity to form Chl (Granick 1948). It was conjectured that since the mutants had lost the ability to form Chl but accumulated Mg-Proto, the latter was a logical precursor of Chl. On the basis of absorbance spectroscopic determinations the accumulated Mg-Proto was assigned by Granick a divinyl (DV) Chemical structure (Fig. 7.1, I), with vinyl groups at positions 2 and 4 of the tetrapyrrole macrocycle.
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Rebeiz, C.A. (2014). The Chl a Carboxylic Biosynthetic Routes: Reactions Between Mg-Protoporphyrin IX and Protochlorophyllide a . In: Chlorophyll Biosynthesis and Technological Applications. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7134-5_7
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