Domain structures of c-di-GMP metabolic enzymes and related mutants generated in this study. (A) Predicted domain architectures and consensus sequence motifs. Orange, GGDEF domain; green, EAL/HD-GYP domain; blue bars, predicted transmembrane domain; gray boxes, other domains. (For more details, see reference 19.) Three proteins contain nonclassical GG(D/E)EF domains, i.e., W909_11190, W909_14945, and W909_01375. Two EAL domain-containing proteins (W909_11910 and W909_01375) lack the conserved key motif (EXLXR). aa, amino acids. (B) Mutants and genotypes used in this study.