This family consists of the photosystem II reaction centre protein PsbJ from plants and Cyanobacteria. The function of this small protein is unknown. Interestingly the mRNA for this protein requires a post-transcriptional modification of an ACG triplet to form an AUG initiator codon [1,2].

1: The psbL gene from bell pepper (Capsicum annuum): plastid RNA editing also occurs in non-photosynthetic chromoplasts. Kuntz M, Camara B, Weil JH, Schantz R; Plant Mol Biol 1992;20:1185-1188. PMID:1463853

2: RNA editing in tobacco chloroplasts leads to the formation of a translatable psbL mRNA by a C to U substitution within the initiation codon. Kudla J, Igloi GL, Metzlaff M, Hagemann R, Kossel H; EMBO J 1992;11:1099-1103. PMID:1547774