Conserved motifs of VvbZIP proteins. All conserved motifs of the VvbZIP proteins were identified by the MEME program. The protein structures (b) of VvbZIPs based on the presence of conserved motifs were arranged corresponding to the phylogenetic tree (a) of the VvbZIP proteins. Different motifs are highlighted with different colored boxes with numbers 1 to 20. Among them, the motif 1, 5, 9 and 13 mainly represented variations in the bZIP domain and the unusual motifs is shown in white. The sequence details of these conserved motifs are given in Additional file 3. The 3D structure and the variation of Leucine zipper region of VvbZIP proteins in length were described in (c).