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GUN4 domain-containing protein
In Arabidopsis, GUN4 is required for the functioning of the plastid mediated repression of nuclear transcription that is involved in controlling the levels of magnesium- protoporphyrin IX. GUN4 binds the product and substrate of Mg-chelatase, an enzyme that produces Mg-Proto, and activates Mg-chelatase. GUN4 is thought to participates in plastid-to-nucleus signaling by regulating magnesium-protoporphyrin IX synthesis or trafficking. [1]. 12574634. GUN4, a regulator of chlorophyll synthesis and intracellular signaling. Larkin RM, Alonso JM, Ecker JR, Chory J;. Science 2003;299:902-906. (from Pfam)
caspase family protein
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