Tags: Protein.
The pentatricopeptide repeat (PPR) is a 35-amino acid sequence motif. Pentatricopeptide repeat containing proteins are a family of proteins commonly found in the plant kingdom. They are distinguished by the presence of tandem degenerate PPR motifs and by the relative lack of introns in the genes coding for them.Approximately 450 such proteins have been identified in the arabidopsis genome and another 477 in the rice genome.