Protein
Pheophorbide a oxygenase, chloroplastic
Organism
Arabidopsis thaliana
Function
Catalyzes the key reaction of chlorophyll catabolism, porphyrin macrocycle cleavage of pheophorbide a (pheide a) to a primary fluorescent catabolite (pFCC). Works in a two-step reaction with red chlorophyll catabolite reductase (RCCR). Creates the intermediate RCC through the opening of the porphyrin macrocycle by the introduction of one atom of molecular oxygen at the alpha-methine bridge. Seems to be specific for pheide a. Belongs to the chlorophyll catabolic enzymes (CCEs).
Sequence
MSVVLLSSTSATITKSQSKKIPFLSPTTKFPLKVSISPSRSKLFHNPLRVAAPPSVPTSDSTEEKRIEEEYGGDKEEEGSEFKWRDHWYPVSLVEDLDPNVPTPFQLLGRDLVLWFDRNDQKWAAFDDLCPHRLAPLSEGRLDENGHLQCSYHGWSFGGCGSCTRIPQAATSGPEARAVKSPRACAIKFPTMVSQGLLFVWPDENGWDRANSIEPPRLPDDFDKPEFSTVTIQRDLFYGYDTLMENVSDPSHIDFAHHKVTGRRDRAKPLPFKVESSGPWGFQGANDDSPRITAKFVAPCYSMNKIELDAKLPIVGNQKWVIWICSFNIPMAPGKTRSIVCSARNFFQFSVPGPAWWQVVPRWYEHWTSNLVYDGDMIVLQGQEKVFLAKSMESPDYDVNKQYTKLTFTPTQADRFVLAFRNWLRRHGKSQPEWFGSTPSNQPLPSTVLTKRQMLDRFDQHTQVCSSCKGAYNSFQILKKFLVGATVFWAATAGVPSDVQIRLVLAGLSLISAASAYALHEQEKNFVFRDYVHSEIE