FIG. 3.

Alignment of deduced amino acid sequences for seven chromosomal AmpC β-lactamases and the first 30 amino acids of five regulatory AmpR proteins (Table 2). The AmpC signal peptides (predicted or experimentally determined by each author) are boxed, and motifs involved in the formation of the active site are marked with asterisks. Amino acids conserved in more than half the sequences are shaded. E. ae, E. aerogenes; E. cl, E. cloacae; C. fr, C. freundii; M. mo, M. morganii; Y. en, Y. enterocolitica; S. ma, Serratia marcescens.