InterPro domain: IPR021099

The plant organelle RNA recognition (PORR) domain, previously known as DUF860, is a component of group II intron ribonucleoprotein particles in maize chloroplasts. It is required for the splicing of the introns with which it associates, and promotes splicing in the context of a heterodimer with the RNase III-domain protein RNC1. Proteins containing this domain are predicted to localise to mitochondria or chloroplasts [ 1 ]. It seems likely that most PORR proteins function in organellar RNA metabolism [ 2 ].

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