Glutamate Synthase is Plastid-encoded in a Red Alga: Implications for the Evolution of Glutamate Synthases

Overview

Journal Plant Mol Biol

Date 1993 Oct 1

PMID 8219058

Citations 5

Authors

K Valentin

M Kostrzewa

K Zetsche

Affiliations

Soon will be listed here.

Abstract

An actively transcribed gene (glsF) encoding for ferredoxin-dependent glutamate synthase (Fd-GOGAT) was found on the plastid genome of the multicellular red alga Antithamnion sp. Fd-GOGAT is not plastid-encoded in chlorophytic plants, demonstrating that red algal plastid genomes encode for additional functions when compared to those known from green chloroplasts. Moreover, our results suggest that the plant Fd-GOGAT has an endosymbiotic origin. The same may not be true for NADPH-dependent GOGAT. In Antithamnion glsF is flanked upstream by cpcBA and downstream by psaC and is transcribed monocistronically. Implications of these results for the evolution of GOGAT enzymes and the plastid genome are discussed.

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