InterPro domain: IPR044211

This entry represents a group of pheophytinases from plants, including PPH, a chloroplast-located and senescence-induced hydrolase widely distributed in algae and land plants. In Arabidopsis, PPH (also known as CRN1) specifically dephytylates the Mg-free chlorophyll pigment, pheophytin (phein), yielding pheophorbide [ 1 ]. It plays a crucial role in Chlorophyll degradation during leaf senescence [ 2 ].

1. Pheophytin pheophorbide hydrolase (pheophytinase) is involved in chlorophyll breakdown during leaf senescence in Arabidopsis. Plant Cell 21, 767-85
2. Reverse genetic identification of CRN1 and its distinctive role in chlorophyll degradation in Arabidopsis. J Integr Plant Biol 52, 496-504