1.3.1.33 chlorophyllide a + NADP+ - 1.3.1.33 chlorophyllide a + NADP+ POR catalyzes the NADPH-dependent reduction of the C17-C18 double bond of protochlorophyllide to form chlorophyllide 1.3.1.33 divinyl protochlorophyllide a + NADPH - 1.3.1.33 monovinyl protochlorophyllide a + NADPH - 1.3.1.33 additional information - 1.3.1.33 additional information does not accept protochlorophyllide a' or any other compounds with substituents at C-13-2 different from protochlorophyllide a 1.3.1.33 additional information naturally occurring esterified protochlorophyllide and chemically prepared protochlorophyllide methyl ester are not substrates for the enzyme, removal of Mg2+ from the protochlorophyllide leads to inactivity of the compound as a substrate 1.3.1.33 additional information the inhibition of por gene expression by continous far red light is mediated by phytochrome A 1.3.1.33 protochlorophyllide + NADH + H+ - 1.3.1.33 protochlorophyllide + NADPH - 1.3.1.33 protochlorophyllide + NADPH constitutive enzyme 1.3.1.33 protochlorophyllide + NADPH important regulatory step in chlorophyll biosynthesis 1.3.1.33 protochlorophyllide + NADPH biosynthetic pathway leading to chlorophyll a 1.3.1.33 protochlorophyllide + NADPH chlorophyll-biosynthetic pathway 1.3.1.33 protochlorophyllide + NADPH key enzyme for light-dependent chlorophyll biosynthesis 1.3.1.33 protochlorophyllide + NADPH key enzyme for the light-induced greening of etiolated angiosperm plants 1.3.1.33 protochlorophyllide + NADPH key enzyme of chlorophyll biosynthesis 1.3.1.33 protochlorophyllide + NADPH key regulatory step in chlorophyll biosynthesis pathway 1.3.1.33 protochlorophyllide + NADPH light-dependent reaction. Isoform PORB and PORC are interchangeable and functionally redundant in developed plants. PORB as well as PORA, functions in assembly of prolamellar bodies and in photoactive protochlorophylluide formation in etiolated seedlings. At the onset of greening, prolamellar bodies are important for efficient capture of light energy for photoconversion under various light conditions, and PORC, which is induced by light irradiation, contributes to photoprotection during greening of the etiolated seedlings 1.3.1.33 protochlorophyllide + NADPH PORB and PORC seem to play redundant roles in maintaining light-dependent chlorophyll biosynthesis in green plants and are together essential for growth and development 1.3.1.33 protochlorophyllide + NADPH the enzyme might be directly involved in the regulation of the metabolism of other porphyrins 1.3.1.33 protochlorophyllide + NADPH the expression of both isoforms, POR1 and POR2, is not negatively regulated by light and persists in matured green tissues. The expression of both genes appears to be regulated by a diurnal regulation 1.3.1.33 protochlorophyllide + NADPH + H+ - 1.3.1.33 protochlorophyllide + NADPH + H+ activation by light 1.3.1.33 protochlorophyllide + NADPH + H+ light-dependent reaction of chlorophyll biosynthesis 1.3.1.33 protochlorophyllide + NADPH + H+ the enzyme (LPOR) catalyzes a photocatalytic reaction 1.3.1.33 protochlorophyllide + reduced ferredoxin ferredoxin is the natural electron donor 1.3.1.33 protochlorophyllide a + NADPH + H+ -