Figure 2.

Schematic Diagram of Ca²⁺ or Ca²⁺/CaM Binding DNA Proteins Showing Various Domains.

(A) Ca²⁺/CaM binding TFs. One representative member in each CaM binding TF family is shown. For a list of all Ca²⁺/CaM binding TFs, see Supplemental Table 1 online.

(B) DNA binding proteins that bind directly to Ca²⁺. CG-1, DNA binding domain; TIG, a nonspecific DNA binding domain; ANK, ankyrin repeats that are implicated in protein–protein interaction; IQ, Ca²⁺-independent CaM binding domain; CBD, CaM binding domain; HARF, conserved domain composed of these residues; WRKY, conserved domain containing these residues; R2R3, Myb DNA binding domain; TAD, transcription activation domain; NAC, conserved domain present in NAM-ATF-CUC proteins; SRF, serum response factor; K-Box, protein–protein interaction domain; GRAS, conserved domain in GAI-RGA-SCR proteins; EF, calcium binding motif; bHLH, basic helix-loop-helix domain. All proteins are drawn to scale. Numbers on the scale indicate the length of the protein in amino acids.