| Description | GUN4 is a porphyrin-binding protein involved in chlorophyll biosynthesis regulation and intracellular signaling, found in aerobic photosynthetic organisms [ , ]. It has been implicated in retrograde signalling between the chloroplast and nucleus []. GUN4 can bind protoporphyrin IX (PIX) and magnesium protoporphyrin IX (MgPIX), substrate and product of the Mg-chelatase, as well as heme and cobalt protoporphyrin IX (CoPIX) []. It may play a role in protecting plants from reactive oxygen species (ROS)-mediated damage [].GUN4 has a multihelical structure composed of an open array, trapping inside an extended region before the C-terminal helix. | Name | GUN4-like superfamily |
| Short Name | GUN4-like_sf | Type | Homologous_superfamily |
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