InterPro domain: IPR019616

Ycf54 is found encoded in the chloroplast genomes of algae, it is also found in plants and in the cyanobacteria. Ycf54 is a component of the MgPME-cyclase complex. Ycf54 plays two roles in the function of the MgPME-cyclase. First, it plays a critical role in t assembly/stability of the Mg-cyclase complex and its constituents and, secondly, is required for normal Pchlide formation. Both functions indicate that this protein is required for optimal MgPME-cyclase activity, although it is not absolutely essential [ 1 ].

1. Conserved residues in Ycf54 are required for protochlorophyllide formation in Synechocystis sp. PCC 6803. Biochem J 474, 667-681