Fig. 3

Amino acid analysis at the g, e, a, and d positions of the Leu zipper and frequency of attractive or repulsive g-e’ pairs. a, Histogram of frequency of amino acids in the g, e, a, and d positions of the Leu zipper for the SlbZIP, AtbZIP, and OsbZIP proteins. b, Histogram of the frequency of Asn residue in the a position of the Leu zippers for all SlbZIP proteins. c Histogram of the frequency of attractive or repulsive g-e’ pairs per heptad for all SlbZIP proteins. Complete g↔e’ pairs were defined if both amino acids at the g and the following e positions are charged while incomplete g↔e’ pairs were defined if only one of the amino acids at the g or e position is charged. According to the electrostatic charges at the g and e positions, the complete g↔e’ pairs were classified into four groups, namely acidic repulsive (acidic amino acids at the g and e positions), basic repulsive (basic amino acids at the g and e positions), +/−attractive (acidic amino acid at g position and basic amino acid at e position) and −/+attractive (basic amino acid at g position and acidic amino acid at e position)