Function
Magnesium chelatase involved in chlorophyll a degradation in the chlorophyll-protein complexes of photosystem I (PSI) and photosystem II (PSII) (PubMed:26732493, PubMed:27604697). Contributes to the degradation of PSI and PSII in the thylakoid membranes (PubMed:26732493, PubMed:27604697). Required to trigger chlorophyll degradation during natural and dark-induced leaf senescence (Probable) (PubMed:26732493). Mediates chlorophyll degradation during embryo degreening (PubMed:24043799, PubMed:26732493, PubMed:28873256). Recombinant SGR2 possesses high dechelating activity against chlorophyll a, very low activity against chlorophyllide a, and no activity against chlorophyll b (PubMed:27604697).