Analyses of EF hand motif distribution and composition. A, Schematics of the domain and motif organization of AtCBLs. The numbering of the EF hands is depicted on the top of the figure. Short jagged lines indicate experimentally verified myristoylation sites and longer jagged lines point to potential palmitoylation motifs. Gray boxes represent EF hands with a conserved canonical amino acid composition, whereas horizontally striped boxes indicate EF hands with single or double non-oxygen-containing amino acid substitutions. Vertically striped boxes depict EF hands with single or double basic amino acid substitutions and diagonally striped boxes stand for EF hands with basic amino acid and non-oxygen-containing amino acid substitutions. B, Detailed comparisons of EF hand motif sequences of the AtCBLs with EF hands from other calcium-binding proteins. The canonical EF hand consensus sequence and coordinates are depicted in the left bottom corner of the figure. Amino acid residues, which match this consensus sequence within one distance unit, are black shaded. The EF hand consensus sequence was calculated based on the calcium-binding EF hands of human CNB (HsCNB, accession no. AAB08721), GCAP-2 (HsGCAP2, accession no. Q9UMX6), yeast NCS-1 (HsNCS, accession no. NP_055101), and Arabidopsis CaM 1 (AtCaM1, accession no NP_198594) and all canonical calcium-binding EF hands of the AtCBLs.