InterPro domain: IPR008543

This family consists of chloroplast encoded Ycf2, which is around 2000 residues in length. The function of Ycf2 is unknown, though it may be an ATPase. Its retention in reduced chloroplast genomes of non-photosynthetic plants, e.g. Epifagus virginiana (Beechdrops), and transformation experiments in tobacco indicate that it has an essential function which is probably not related to photosynthesis [ 1 ].

1. The two largest chloroplast genome-encoded open reading frames of higher plants are essential genes. Plant J. 22, 97-104