Figure 4. The L2 motifs in RNA editing PPR proteins correlate with nucleotide identities.

(A) Correlations between amino acid and respective nucleotide identities in the target RNAs reveal preferential combinations with amino acid position 6 in the sequence logos. (B) Amino acid identities leucine and isoleucine at position 6 correlate with C, U or A (respectively G) in descending frequency, whereas threonine at this position is prevalent opposite nucleotide A. As in the L repeats, amino acid V occurs with any nucleotide. Preferences at position 1′ are not apparent in the sample size available.