Table 1.

PPR Proteins Are Specific to Eukaryotes

OrganismSequencesPPR HitsE HitsDYW Hits
Homo sapiens37,490600
Drosophila melanogaster17,087200
Caenorhabditis elegans20,673200
Schizosaccharomyces pombe5,010600
Saccharomyces cerevisiae6,304500
Trypanosoma brucei16,7571900
Cyanidioschyzon merolae4,7721000
Arabidopsis thaliana28,58147019387
Oryza sativa74,385655292104
Ralstonia solanacearum5,118100
Rickettsia prowazekii834000
Synechocystis sp3,169000
  • Searches for PPR and PPR-associated motifs were conducted on complete or quasicomplete predicted proteomes from a range of species using HMMER. The figures indicate the number of proteins found to contain two or more PPR motifs with an E-value of <10 or one or more E or DYW motifs with a score of >0.