GUN4, a regulator of chlorophyll synthesis and intracellular signaling - PubMed (original) (raw)

. 2003 Feb 7;299(5608):902-6.

doi: 10.1126/science.1079978.

Affiliations

• PMID: 12574634
• DOI: 10.1126/science.1079978

GUN4, a regulator of chlorophyll synthesis and intracellular signaling

Robert M Larkin et al. Science. 2003.

Abstract

Nuclear genes control plastid differentiation in response to developmental signals, environmental signals, and retrograde signals from plastids themselves. In return, plastids emit signals that are essential for proper expression of many nuclear photosynthetic genes. Accumulation of magnesium-protoporphyrin IX (Mg-Proto), an intermediate in chlorophyll biosynthesis, is a plastid signal that represses nuclear transcription through a signaling pathway that, in Arabidopsis, requires the GUN4 gene. GUN4 binds the product and substrate of Mg- chelatase, an enzyme that produces Mg-Proto, and activates Mg-chelatase. Thus, GUN4 participates in plastid-to-nucleus signaling by regulating Mg-Proto synthesis or trafficking.

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