MetaCyc Enzyme: protochlorophyllide oxidoreductase

Gene: PORA Accession Number: AT5G54190 (MetaCyc)

Synonyms: AT5g54190

Species: Arabidopsis thaliana col

The NADPH:protochlorophyllide oxidoreductase (POR) catalyzes the photoreduction of protochlorophyllide to chlorophyllide in higher plants. It has been shown that there are two POR's active, POR A which is exclusively expressed in young plants and is required for greening and POR B which is expressed both in seedlings and adult plants and sustains light-dependent chlorophyll biosynthesis in mature plants [Armstrong95] [Runge96]. Although a wealth of information has been accumulated on the functions and properties of the light-dependent PORA and PORB enzymes, the only functional information available at the time of this review concern PORC.
NADPH:protochlorophyllide oxidoreductase A (gb|AAC49043.1)

Citations: [Franck00, Frick03]

Map Position: [21,295,770 -> 21,297,360] (79.79 centisomes)

Unification Links: Entrez:AAC49043 , TAIR:AT5g54190

Relationship Links: Entrez-Nucleotide:PART-OF:U29699

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

Enzymatic reaction of: protochlorophyllide oxidoreductase

EC Number:

chlorophyllide a + NADP+ <=> protochlorophyllide a + NADPH + H+

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the Enzyme Commission system.

The reaction is favored in the opposite direction.

In Pathways: chlorophyllide a biosynthesis I (aerobic, light-dependent)


Armstrong95: Armstrong GA, Runge S, Frick G, Sperling U, Apel K (1995). "Identification of NADPH:protochlorophyllide oxidoreductases A and B: a branched pathway for light-dependent chlorophyll biosynthesis in Arabidopsis thaliana." Plant Physiol 1995;108(4);1505-17. PMID: 7659751

Franck00: Franck F, Sperling U, Frick G, Pochert B, van Cleve B, Apel K, Armstrong GA (2000). "Regulation of etioplast pigment-protein complexes, inner membrane architecture, and protochlorophyllide a chemical heterogeneity by light-dependent NADPH:protochlorophyllide oxidoreductases A and B." Plant Physiol 124(4);1678-96. PMID: 11115885

Frick03: Frick G, Su Q, Apel K, Armstrong GA (2003). "An Arabidopsis porB porC double mutant lacking light-dependent NADPH:protochlorophyllide oxidoreductases B and C is highly chlorophyll-deficient and developmentally arrested." Plant J 35(2);141-53. PMID: 12848821

Runge96: Runge S, Sperling U, Frick G, Apel K, Armstrong GA (1996). "Distinct roles for light-dependent NADPH:protochlorophyllide oxidoreductases (POR) A and B during greening in higher plants." Plant J 1996;9(4);513-23. PMID: 8624514

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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
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