InterPro domain: IPR045040

This entry represents the PORR (plant organelle RNA recognition domain, previously DUF860) family of proteins which localise to either mitochondria or chloroplasts, and it seems likely that most PORR proteins function in organellar RNA metabolism. Including in this family are Protein root primordium defective 1-like (RPD1) and Protein WHAT'S THIS FACTOR1 [ 1 , 2 , 3 ]. RPD1 is involved in pre-arranging the maintenance of the active cell proliferation during root primordium development [ 4 ]. WTF1 is a RNA-binding protein involved in the chloroplastic group II intron splicing [ 4 ].

1. A plant-specific RNA-binding domain revealed through analysis of chloroplast group II intron splicing. Proc. Natl. Acad. Sci. U.S.A. 106, 4537-42
2. A novel plant-specific family gene, ROOT PRIMORDIUM DEFECTIVE 1, is required for the maintenance of active cell proliferation. Plant Physiol. 140, 591-602
3. A PORR domain protein required for rpl2 and ccmF(C) intron splicing and for the biogenesis of c-type cytochromes in Arabidopsis mitochondria. Plant J 69, 996-1005